Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 LIBOR [Member]	Sep. 30, 2013 Base Rate [Member]	Sep. 30, 2013 Term Loan [Member]	Sep. 30, 2013 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	$ 20,000	$ 252,000
Notes issued specified as percentage of principal amount (in hundredths)							99.00%
Interest rate of notes (in hundredths)									11.75%
Amount outstanding under revolving credit facility								0
Debt to adjusted EBITDA ratio	5.1		5.1
Maximum allowable debt to adjusted EBITDA ratio	5.5		5.5
Floor rate of loan (in hundredths)					1.25%	2.25%
Margin rate for borrowings (in hundredths)					4.75%	3.75%
Interest rate under credit agreement (in hundredths)	6.00%		6.00%
Increase in interest rate in case of default (in hundredths)			2.00%
Interest rate cap, period	2 years
Interest rate cap (in hundredths)	3.00%		3.00%
Percentage of total amount of principal outstanding (in hundredths)	50.00%
Interest rate cap, cost	65
Capitalization of debt issuance costs	4,588		4,588
Required principal payment	638
Additional voluntary payment of term loan	6,000
Interest expense	4,149	8,094	17,303	24,217
Amortization of notes issuance costs	124	520	901	1,512
Amortization of net debt discount	70	171	342	498
Unamortized debt issuance costs	5,235		5,235
Unamortized net debt discount	1,724		1,724
Early retirement costs associated with the extinguishment of the Notes			$ 16,863	$ 0