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Debt (Narrative) (Details) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||||||||||||||||||||||
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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Jun. 30, 2010
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Dec. 31, 2010
Parent [Member]
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Dec. 31, 2009
Parent [Member]
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Dec. 31, 2010
Interest Rate Contract [Member]
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Dec. 31, 2010
Interest Rate Contract One [Member]
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Dec. 31, 2010
Interest Rate Contract Two [Member]
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May 31, 2010
Secured Credit Facility [Member]
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Dec. 31, 2010
Revolving Credit Facilities [Member]
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Dec. 31, 2009
Revolving Credit Facilities [Member]
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Jun. 30, 2007
Collateralized Revolving Bank Credit Facility [Member]
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Dec. 31, 2010
Collateralized Revolving Bank Credit Facility [Member]
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Dec. 31, 2009
Collateralized Revolving Bank Credit Facility [Member]
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Dec. 31, 2010
2006 Senior Unsecured Notes [Member]
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Dec. 31, 2009
2006 Senior Unsecured Notes [Member]
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Dec. 31, 2006
2006 Senior Unsecured Notes [Member]
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Dec. 31, 2010
Senior Notes Issuance 1 [Member]
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Dec. 31, 2010
Senior Notes Remaining Issuance [Member]
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Apr. 30, 2008
Exchangeable Senior Notes [Member]
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Mar. 31, 2008
Exchangeable Senior Notes [Member]
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Nov. 30, 2006
Exchangeable Senior Notes [Member]
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Dec. 31, 2010
Exchangeable Senior Notes [Member]
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Dec. 31, 2009
Exchangeable Senior Notes [Member]
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Apr. 30, 2010
Exchangeable Senior Notes [Member]
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Jun. 30, 2008
Term Loans [Member]
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Dec. 31, 2010
Term Loans [Member]
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Dec. 31, 2009
Term Loans [Member]
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Nov. 30, 2008
Collateralized Term Loan [Member]
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Dec. 31, 2010
Collateralized Term Loan [Member]
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Dec. 31, 2010
Minimum [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2009
Minimum [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2010
Maximum [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2009
Maximum [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2010
LIBOR [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2009
LIBOR [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2010
LIBOR [Member]
Collateralized Revolving Bank Credit Facility [Member]
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Dec. 31, 2010
LIBOR [Member]
2006 Senior Unsecured Notes [Member]
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Dec. 31, 2009
LIBOR [Member]
Term Loans [Member]
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Dec. 31, 2010
LIBOR [Member]
Term Loans [Member]
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Dec. 31, 2010
LIBOR [Member]
Minimum [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2010
LIBOR [Member]
Maximum [Member]
Revolving Credit Facilities [Member]
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Nov. 30, 2006
Capped Call [Member]
Exchangeable Senior Notes [Member]
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Dec. 31, 2010
Federal Funds Rate [Member]
Revolving Credit Facilities [Member]
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Dec. 31, 2010
Federal Funds Rate [Member]
Term Loans [Member]
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Dec. 31, 2010
LIBOR Floor [Member]
Term Loans [Member]
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Sep. 30, 2010
2010 Term Loan [Member]
Secured Credit Facility [Member]
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May 31, 2010
2010 Term Loan [Member]
Secured Credit Facility [Member]
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Dec. 31, 2009
2010 Term Loan [Member]
Term Loans [Member]
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Sep. 30, 2010
2010 Revolving Facility [Member]
Secured Credit Facility [Member]
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May 31, 2010
2010 Revolving Facility [Member]
Secured Credit Facility [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| New secured credit facility | $ 450,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Repaid and terminated term loan facility | 216,765,000 | 1,232,000 | 860,000 | 220,000,000 | 30,000,000 | 220,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Percentage of outstanding notes purchased from senior unsecured notes offering | 93.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Unsecured senior notes, interest rate | 6.125% | 7.871% | 9.25% | 5.66% | 0.50% | 0.50% | ||||||||||||||||||||||||||||||||||||||||||||||
| Paid off term loan | 30,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Charge of refinancing activities | 6,700,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, amount outstanding | 96,000,000 | 42,000,000 | 0 | 41,200,000 | 149,300,000 | 29,600,000 | 9,000,000 | 8,400,000 | 64,500,000 | 300,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, additional borrowing | 330,000,000 | 375,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, repayment term (in years) | five years | 6 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, maturity date | May 17, 2013 | November 2013 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, basis spread of interest rate | 2.00% | 1.99% | 1.77% | 1.73% | 5.00% | 2.26% | 2.00% | 2.75% | 3.00% | 1.75% | 1.50% | 2.30% | 4.23% | 3.50% | 3.00% | 3.75% | 2.50% | 1.50% | ||||||||||||||||||||||||||||||||||
| Fixed rate, minimum | 7.333% | 7.333% | 7.333% | 6.125% | 6.125% | |||||||||||||||||||||||||||||||||||||||||||||||
| Fixed rate, maximum | 7.871% | 7.871% | 7.715% | 9.25% | 9.25% | |||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, percentage of commitment fee on unused capacity | 0.375% | 0.20% | 0.50% | 0.35% | ||||||||||||||||||||||||||||||||||||||||||||||||
| Maximum percentage of borrowing under credit facilities | 55.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, remaining borrowing capacity | 322,400,000 | 40,400,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, weighted average interest rate | 2.21% | 1.74% | 1.86% | |||||||||||||||||||||||||||||||||||||||||||||||||
| Credit facilities, decrease | 800,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Collateralized real estate property | 56,500,000 | 57,900,000 | 18,200,000 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Senior unsecured notes | 125,000,000 | 65,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Percent of outstanding notes repurchased | 93.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate swap, amount fixed | 65,000,000 | 60,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Total senior notes available | 369,970,000 | 576,678,000 | 125,000,000 | 369,970,000 | 576,678,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Interest rate of interest rate derivative instrument | 5.507% | 5.675% | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Notes | 7,000,000 | 75,000,000 | 138,000,000 | 9,200,000 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Notes, maturity date | Apr. 01, 2013 | Nov. 15, 2011 | May 17, 2016 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Initial exchange rate of notes | 80.8898 | 60.3346 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Principal amount of exchangeable senior notes | 1,000 | 1,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Exchange price of notes per common share | $ 12.36 | $ 16.57 | $ 18.94 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Senior Notes, maturity date, start | January 1, 2013 | August 15, 2011 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Proceeds from senior notes | 6,800,000 | 72,800,000 | 134,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Price of principal amount plus accrued and unpaid interest, in percentage | 103.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Price of principal amount plus accrued and unpaid interest, in amount | 136,300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Shares reserved for future settlement of exchangeable note | 8,300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Premium paid for capped call transaction | 6,300,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt face amount | 137,200,000 | 125,000,000 | 125,000,000 | 91,175,000 | 220,000,000 | 157,683,000 | 102,743,000 | 150,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Dividend rate as percentage of normalized adjusted funds from operations | 90.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Quarterly principal payments of loans | 375,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Debt instrument basis spread on variable interest rate | 400 | 200 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair value of the interest rate swaps | 3,600,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Hedge ineffectiveness and income statement effect in period | $ 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||