Debt - Long-term debt schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument
Long-term Debt, Gross	$ 945,000	$ 1,095,000
Unamortized discount and debt issuance costs	7,973	9,217
Total long-term debt	937,027	1,085,783
Less current maturities of long-term debt	0	0
Long-term debt less current maturities	937,027	1,085,783
Senior Unsecured Notes 2029
Debt Instrument
Long-term Debt, Gross	400,000	0
Senior Unsecured Notes 2028
Debt Instrument
Long-term Debt, Gross	400,000	400,000
Senior secured term loan facility due 2025
Debt Instrument
Long-term Debt, Gross	145,000	145,000	$ 400,000
Senior unsecured notes due 2026
Debt Instrument
Long-term Debt, Gross	$ 0	$ 550,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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