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Long-Term Debt (Details) - USD ($)	1 Months Ended			12 Months Ended
	Feb. 28, 2021	Aug. 31, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 16, 2021	Jul. 15, 2021	Dec. 31, 2016	Apr. 30, 2014	Feb. 28, 2013
Debt Instrument
Repayments of long-term debt				$ 333,790,000	$ 333,637,000	$ 724,000,000
Total long-term debt				498,871,000	513,387,000
Less: current portion				0	(28,790,000)
Total long-term debt, net of current portion				498,871,000	484,597,000
Current installments of finance lease obligations				280,000	2,707,000
Finance lease obligations				9,000	289,000
Total finance lease obligations				$ 289,000	2,996,000
Applicable margins (percent)				4.00%
Gain on retirement of senior unsecured notes				$ 0	3,484,000	$ 0
Revolving Loan Facility
Debt Instrument
Maximum borrowing capacity				$ 275,000,000			$ 275,000,000	$ 300,000,000
Weighted average interest rate				5.00%
Unamortized debt issuance costs				$ 2,613,000	3,826,000
Total long-term debt				$ 156,887,000	144,174,000
Revolving Loan Facility | LIBOR
Debt Instrument
Interest rate floor (percent)				1.00%
Revolving Loan Facility | Minimum | LIBOR
Debt Instrument
Applicable margins (percent)				2.75%
Revolving Loan Facility | Minimum | Prime Rate
Debt Instrument
Applicable margins (percent)				1.75%
Revolving Loan Facility | Maximum | LIBOR
Debt Instrument
Applicable margins (percent)				4.00%
Revolving Loan Facility | Maximum | Prime Rate
Debt Instrument
Applicable margins (percent)				3.00%
Senior Notes | Senior Notes 7.250%
Debt Instrument
Unamortized debt issuance costs				$ 0	0
Face amount				$ 400,000,000						$ 150,000,000	$ 250,000,000
Fixed rate cost				7.25%
Unamortized premium				$ 0	344,000
Amount of debt repurchased			$ 9,344,000	9,344,000					$ 26,200,000
Debt refinanced		$ 335,666,000
Repayments of long-term debt	$ 28,790,000
Total long-term debt				0	28,790,000
Gain on retirement of senior unsecured notes			$ 3,484,000
Senior Notes | 2024 Notes
Debt Instrument
Unamortized debt issuance costs				2,433,000	3,577,000
Face amount				$ 53,750,000
Fixed rate cost				10.00%
Total long-term debt				$ 51,317,000	50,173,000
Senior Notes | 2025 Notes
Debt Instrument
Unamortized debt issuance costs				1,303,000	1,720,000
Face amount				$ 291,970,000
Fixed rate cost				11.50%
Total long-term debt				$ 290,667,000	$ 290,250,000

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