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, 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 of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Debt Obligations - Future Maturities (Details) - USD ($)		12 Months Ended
	Feb. 19, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2021
Scheduled Principal Payments
2021		$ 47,160,000
2022		138,060,000
2023		49,160,000
2024		49,160,000
2025		49,500,000
Thereafter		317,000,000
Total		650,040,000
Other information
Payments on debt		68,160,000	$ 159,667,000	$ 138,866,000
Outstanding Balance		649,382,000	693,388,000
Bank Borrowings
Scheduled Principal Payments
2022		89,900,000
Total		89,900,000
Other information
Payments on debt		28,000,000	126,000,000	100,700,000
Outstanding Balance		89,900,000	93,900,000
Bank Borrowings \| Subsequent Event
Other information
Outstanding Balance					$ 98,900,000
Senior Unsecured Notes
Scheduled Principal Payments
2021		47,160,000
2022		48,160,000
2023		49,160,000
2024		49,160,000
2025		49,500,000
Thereafter		317,000,000
Total		560,140,000
Other information
Payments on debt	$ 7,000,000	40,160,000	33,667,000	$ 38,166,000
Outstanding Balance	552,482,000	$ 559,482,000	$ 599,488,000
Senior Unsecured Notes \| Subsequent Event
Other information
Payments on debt	7,000,000
Outstanding Balance	$ 552,482,000