Long-term Debt (Details)					12 Months Ended
	Dec. 09, 2013 USD ($)	Feb. 15, 2013 USD ($) amendment	Dec. 06, 2012 USD ($)	Aug. 08, 2012 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2012 USD ($)
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity				$ 390,000,000
Percent of assets pledged for secured debt				100.00%
Amortization of debt discount							$ 900,000
Deferred finance costs							5,700,000
Loss on extinguishment of debt					$ 0	$ 0	15,918,000
Amortization of debt issuance costs and accretion of original issue discount					$ 122,000	122,000	2,511,000
Effective interest rate					3.75%
Commitment fee percentage					0.50%
Interest expense, debt						15,900,000	22,900,000
Interest costs capitalized						2,000,000	2,300,000
Covenant terms, maximum indebtedness exclusions					$ 40,000,000
Secured leverage ratio					3.75
Long-term Debt, by Current and Noncurrent [Abstract]
Term loan					$ 387,097,000	391,057,000
Less current maturities					(3,960,000)	(3,960,000)		$ (3,960,000)
Total long-term debt					383,137,000	387,097,000		$ 383,137,000
Term Facility [Member]
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity				$ 350,000,000
Unamortized discount									$ 7,000,000
Payments of special dividend				350,000,000
Long-term debt, fair value					$ 385,200,000	$ 386,200,000
Effective interest rate					3.87%	3.75%
Periodic principal payment					$ 1,000,000
Periodic payment, balloon payment to be paid					$ 373,200,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity				40,000,000
Effective interest rate						4.03%
Interest rate, stated percentage						4.25%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity				10,000,000
Swing Line Facility [Member]
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity				$ 5,000,000
Federal Funds Effective Swap Rate [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					0.50%
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					0.50%
London Interbank Offered Rate (LIBOR) [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					1.00%
Interest rate, variable rate					2.75%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					1.00%
Interest rate, variable rate					3.25%
Base Rate [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Interest rate, variable rate					1.75%
Base Rate [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate, stated percentage					2.25%
First Amended Credit Facility [Member]
Line of Credit Facility [Line Items]
Payments of special dividend			$ 50,000,000
First Amended Credit Facility [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Additional borrowings			50,000,000
Deferred finance costs			$ 1,200,000
Second Amended Credit Facility [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Deferred finance costs		$ 4,700,000
Number of amendments | amendment		2
Line of credit, principal amount		$ 399,000,000
Variable rate decrease		(1.50%)
Basis spread on variable rate decrease in floor		0.00%
Second Amended Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit, principal amount							0
Variable rate decrease		(1.50%)
Second Amended Credit Facility [Member] | Interest Expense [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Debt instrument, fee amount							$ 500,000
Third Amended Credit Facility [Member]
Line of Credit Facility [Line Items]
Loss on extinguishment of debt	$ 15,900,000
Amortization of debt issuance costs and accretion of original issue discount	9,200,000
Unamortized discount, net	5,700,000
Debt issuance cost	1,000,000
Third Amended Credit Facility [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Line of credit, principal amount	$ 396,000,000
Basis spread on variable rate decrease in floor	(0.75%)
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					1.00%
Minimum [Member] | Base Rate [Member] | Term Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate					2.00%