Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 1,025,465	$ 834,476
Less: Current maturities	100,188	124,054
Long-term debt, net	925,277	710,422
Restricted cash held to repay outstanding debt	69,900
Convertible Debt
Debt Instrument [Line Items]
Total debt	67,878	182,292
Equipment financing and mortgages
Debt Instrument [Line Items]
Total debt	47,594	39,159
Other indebtedness
Debt Instrument [Line Items]
Total debt	6,264	4,660
Term Loan B
Debt Instrument [Line Items]
Total debt	408,458
2017 Senior Notes \| 2017 Senior Notes
Debt Instrument [Line Items]
Total debt	495,271	494,365
2017 Credit Facility \| Credit Facility
Debt Instrument [Line Items]
Total debt		$ 114,000
Credit Facility 2020
Debt Instrument [Line Items]
Total debt	$ 0

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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