Debt (Details) (USD $)	3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 LIBOR [Member]	Mar. 31, 2014 Term Loan [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Dec. 31, 2011 Senior Secured Notes [Member]
Debt Instrument [Line Items]
Issuance date for debt instrument					Apr. 23, 2013	Apr. 23, 2013
Debt instrument maturity period					6 years	5 years
Principal amount of notes issued					$ 255,000,000	$ 20,000,000	$ 252,000,000
Notes issued specified as percentage of principal amount (in hundredths)					99.00%
Amount outstanding under revolving credit facility						0
Long-term Debt, Fiscal Year Maturity [Abstract]
2014	1,739,000
2015	2,319,000
2016	2,319,000
2017	2,319,000
2018	2,319,000
2019	219,118,000
Interest rate of notes (in hundredths)							11.75%
Debt to adjusted EBITDA ratio	5.3
Maximum allowable debt to adjusted EBITDA ratio	5.5
Interest rate under credit agreement (in hundredths)	6.00%
Effective interest rate (in hundredths)	6.60%
Weighted average interest rate (in hundredths)	6.00%
Floor rate of loan (in hundredths)				1.25%
Margin rate for borrowings (in hundredths)				4.75%
Interest rate cap (in hundredths)	3.00%
Percentage of total amount of principal outstanding (in hundredths)	50.00%
Percentage decrease in interest rate cap (in hundredths)	50.00%
Capitalization of debt issuance costs			4,588,000
Amortization of net debt discount and issuance costs	492,000	736,000			2,550,000
Unamortized debt issuance costs	3,810,000
Unamortized net debt discount	2,117,000
Required principal payment	592,000				2,319,000
Additional voluntary payment of term loan	8,000,000
Interest expense	4,119,000	8,139,000
Amortization of notes issuance costs	316,000	554,000
Amortization of net debt discount	$ 176,000	$ 182,000