Long-Term Debt and Senior Subordinated Credit Facility (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended			0 Months Ended		1 Months Ended		0 Months Ended			0 Months Ended		12 Months Ended	0 Months Ended								9 Months Ended				9 Months Ended		0 Months Ended								0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Committed Incremental Term Loan	Jun. 03, 2013 New Credit Agreement	Jul. 03, 2013 New Credit Agreement Term Loan Facility	Jun. 03, 2013 New Credit Agreement Term Loan Facility	Sep. 30, 2013 New Credit Agreement Term Loan Facility	Sep. 30, 2014 New Credit Agreement Term Loan Facility	Oct. 11, 2013 New Credit Agreement Committed Incremental Term Loan	Dec. 02, 2013 New Credit Agreement Committed Incremental Term Loan	Nov. 07, 2013 New Credit Agreement Committed Incremental Term Loan	Jun. 03, 2013 New Credit Agreement Delayed Draw	Jun. 03, 2013 New Credit Agreement Senior notes	Dec. 31, 2013 New Credit Agreement Senior notes	Jun. 03, 2013 New Credit Agreement Revolving Credit Facility	Sep. 30, 2014 New Credit Agreement Revolving Credit Facility	Jun. 03, 2013 New Credit Agreement Letter of Credit	Jun. 03, 2013 New Credit Agreement Uncommitted Incremental Loan Facility	Sep. 30, 2014 Maximum	Jun. 03, 2013 Maximum Revolving Credit Facility	Sep. 30, 2014 Maximum New Credit Agreement Term Loan Facility	Jun. 03, 2013 Maximum New Credit Agreement Term Loan Facility	Sep. 30, 2014 Maximum New Credit Agreement Committed Incremental Term Loan	Sep. 30, 2014 Minimum	Jun. 03, 2013 Minimum Revolving Credit Facility	Sep. 30, 2014 Minimum New Credit Agreement Term Loan Facility	Sep. 30, 2014 Minimum New Credit Agreement Committed Incremental Term Loan	Jun. 03, 2013 LIBOR Revolving Credit Facility	Jun. 03, 2013 LIBOR New Credit Agreement	Jun. 03, 2013 LIBOR New Credit Agreement Term Loan Facility	Oct. 11, 2013 LIBOR New Credit Agreement Committed Incremental Term Loan	Jun. 03, 2013 LIBOR New Credit Agreement Revolving Credit Facility	Jun. 03, 2013 LIBOR Maximum New Credit Agreement Revolving Credit Facility	Jun. 03, 2013 LIBOR Minimum New Credit Agreement Revolving Credit Facility	Jun. 03, 2013 Base Rate Term Loan Facility	Jun. 03, 2013 Base Rate Revolving Credit Facility	Jun. 03, 2013 Base Rate New Credit Agreement	Jun. 03, 2013 Base Rate New Credit Agreement Term Loan Facility	Oct. 11, 2013 Base Rate New Credit Agreement Committed Incremental Term Loan	Jun. 03, 2013 Base Rate Maximum New Credit Agreement Revolving Credit Facility	Jun. 03, 2013 Base Rate Minimum New Credit Agreement Revolving Credit Facility
Debt Instrument [Line Items]
Term loan facility borrowing capacity								$ 340,000,000	$ 340,000,000			$ 70,000,000	$ 70,000,000	$ 70,000,000	$ 80,000,000			$ 50,000,000		$ 20,000,000	$ 100,000,000
Debt, leverage ratio																							0.005	4.90	3.25			0.00375								0.0325	0.03						0.0225	0.02
Debt floor interest rate (percent)																															2.00%			1.00%	1.00%			4.25%	5.25%
Debt term (years)									6 years									5 years
Components of long-term debt
Long-term debt, gross																80,000,000
Long-term debt, including current portion	505,282,000		505,282,000		529,674,000
Long-term debt	486,794,000		486,794,000		514,608,000
Discount rate on debt (percent)																8.25%
Repayments of long-term debt			3,675,000	341,485,000				80,000,000
Loss on extinguishment of debt	0	(5,132,000)	0	(22,201,000)	(17,069,000)												(1,522,000)
Gains (Losses) on Extinguishment of Debt, Related Call Premium Expense																	3,200,000
Basis spread on variable rate (percent)																																1.00%	3.25%	3.25%						0.50%	2.25%	2.25%
Debt description of variable rate basis																																one-month LIBOR
Debt, quarterly payments at debt capacity															1,050,000
Ownership percentage of subsidiaries							50.00%															50.00%					15.00%
Covenant ratio of consolidated total debt to Consolidated Adjusted EBITDA, current year																								4.95					4.30
Principal amount repurchased										8,772,000
Unamortized deferred cost expensed										160,000
Accretion of discount on long-term debt			334,000	890,000						251,000
Annual cash interest savings expected												5,000,000
Percentage of principal amount funded												99.00%
Revolving credit facility											484,050,000		70,000,000						0
Actual ratio of consolidated total debt to Consolidated Adjusted EBITDA											3.62
Debt Instrument, Periodic Payment																										$ 1,225,000				$ 1,050,000
Debt instrument, period quarterly amortization payments required															5 years 9 months
Percent of subsidiary owned to qualify for loan guarantee						50.00%