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Debt (Details) (USD $)
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3 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Jun. 30, 2012
Revolving Credit Facilities [Member]
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Dec. 31, 2011
Revolving Credit Facilities [Member]
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Sep. 30, 2011
Federal funds rate [Member]
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Sep. 30, 2011
Margin rate [Member]
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Sep. 30, 2011
LIBOR [Member]
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Jun. 30, 2012
11.75% Senior Secured Notes due July 15, 2015 [Member]
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Jun. 30, 2012
11.75% Senior Secured Notes due July 15, 2015 [Member]
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Jul. 13, 2010
11.75% Senior Secured Notes due July 15, 2015 [Member]
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Sep. 30, 2011
Tranche A [Member]
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Jun. 30, 2012
Tranche A [Member]
Revolving Credit Facilities [Member]
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Sep. 30, 2011
Tranche B [Member]
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Jun. 30, 2012
Tranche B [Member]
Revolving Credit Facilities [Member]
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| Debt (Textual) [Abstract] | |||||||||||||||||
| Senior Secured Notes, face value | $ 100,000,000 | $ 300,000,000 | $ 20,000,000 | ||||||||||||||
| Senior secured notes, interest rate | 11.75% | 11.75% | |||||||||||||||
| Maturity date | Jul. 15, 2015 | Jul. 15, 2015 | Apr. 15, 2015 | ||||||||||||||
| Offering price | 99.077% | ||||||||||||||||
| Original issue discount | 2,800,000 | ||||||||||||||||
| Net proceeds of acquisitions | 286,900,000 | ||||||||||||||||
| Purchase of Senior Secured Notes | 101.00% | ||||||||||||||||
| Redemption of Initial Public Offer | 105,000,000 | ||||||||||||||||
| Amounts outstanding | 30,000,000 | 70,000,000 | |||||||||||||||
| Consolidated Secured Debt Ratio | 3.50 | ||||||||||||||||
| Federal fund rate | 0.50% | 2.00% | 3.00% | 2.25% | 3.25% | ||||||||||||
| Covenant | The Revolving Credit agreement contains customary financial and other covenants, including maximum consolidated leverage ratio of 4.50:1.00 and in certain instances 4.25:1.00. In addition, the Company is subject to covenants limiting incurrence of debt, liens on properties, investments, loans and advances, mergers and consolidations, asset sales, dividends and transactions with affiliates. The Company was in compliance with all required covenants as of June 30, 2012. | ||||||||||||||||
| Amortized deferred loan fee | 339,000 | 4,720,000 | 668,000 | 990,000 | 189,000,000 | 377,000,000 | |||||||||||
| Outstanding deferred loan fee | 5,100,000 | 5,100,000 | 5,800,000 | 2,200,000 | 2,500,000 | ||||||||||||
| Debt (Additional Textual) [Abstract] | |||||||||||||||||
| Interest expense | 5,700,000 | 8,800,000 | 11,500,000 | 17,600,000 | |||||||||||||
| Net of amortization | 193,800,000 | 193,800,000 | 193,600,000 | ||||||||||||||
| Amortization included in interest expense | 81,000 | 109,000 | 160,000 | 215,000 | |||||||||||||
| Outstanding discounts | $ 1,200,000 | $ 1,200,000 | $ 1,400,000 | ||||||||||||||