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Debt - Long-term Debt (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Gross long-term debt	$ 375,397,000	$ 443,035,000
Less - Current maturities of long-term debt	(77,434,000)	(42,473,000)
Less - Unamortized debt issuance costs	(6,714,000)	(9,935,000)
Long-term debt	291,249,000	390,627,000
Other debt
Debt Instrument [Line Items]
Gross long-term debt	10,397,000	805,000
Secured Debt | Term Loan Facility
Debt Instrument [Line Items]
Gross long-term debt	355,000,000	400,000,000
Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Gross long-term debt	0	20,000,000
Secured Debt | Credit Facility
Debt Instrument [Line Items]
Gross long-term debt	355,000,000	420,000,000
Notes Payable | Plateau
Debt Instrument [Line Items]
Gross long-term debt	$ 10,000,000	$ 10,000,000

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Long-term Debt, Current Maturities, Gross

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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.

+ References

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-Publisher FASB
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-Topic 470
-SubTopic 20
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Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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