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Term Loan Facility and Line of Credit (Term Loan Facility) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 1 Months Ended | 6 Months Ended | ||||||||||
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Oct. 26, 2012
Term Loan Facility [Member]
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Jul. 27, 2012
Term Loan Facility [Member]
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May 16, 2012
Term Loan Facility [Member]
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May 04, 2013
Term Loan Facility [Member]
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May 04, 2013
2013 Term Loan [Member]
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May 04, 2013
2014 Term Loan [Member]
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May 04, 2013
2014 And Thereafter [Member]
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May 04, 2013
Federal Funds Effective Rate Plus [Member]
Term Loan Facility [Member]
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May 04, 2013
Federal Funds Effective Rate Plus Margin [Member]
Term Loan Facility [Member]
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May 04, 2013
LIBOR-Based Rate [Member]
Term Loan Facility [Member]
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May 04, 2013
LIBOR Plus Margin [Member]
Term Loan Facility [Member]
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May 04, 2013
Secured Debt [Member]
Term Loan Facility [Member]
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May 31, 2013
Subsequent Event [Member]
Term Loan Facility [Member]
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Aug. 03, 2013
Subsequent Event [Member]
Term Loan Facility [Member]
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| Debt Instrument [Line Items] | ||||||||||||||
| Borrowing under term loan facility | $ 100,000,000 | |||||||||||||
| Convertible preferred stock, dividends | 99,500,000 | |||||||||||||
| Effective interest rate | 0.50% | 3.25% | 1.00% | 4.25% | ||||||||||
| Interest rate (percent) | 2.00% | 5.25% | ||||||||||||
| Cash and cash equivalents | 10,000,000 | |||||||||||||
| Consolidated leverage ratio, maximum | 2.75 | |||||||||||||
| Consolidated leverage ratio, minimum | 2.50 | |||||||||||||
| Leverage ratio on credit facility | 2.00 | 1.75 | ||||||||||||
| Term loan facility subject to repayment | 50,000,000 | |||||||||||||
| Repayment of Term Loan Facility | 300,000 | 65,300,000 | ||||||||||||
| Interest expense | 700,000 | 500,000 | ||||||||||||
| Term loan facility outstanding amount | 34,500,000 | |||||||||||||
| Repayments of debt | 15,000,000 | |||||||||||||
| Deferred financing costs incurred in connection with Term Loan Facility | 2,700,000 | |||||||||||||
| Write off of deferred financing costs | $ 1,600,000 | $ 300,000 | ||||||||||||