Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 1,025,671	$ 1,025,465
Less: Current maturities	101,020	100,188
Long-term debt, net	924,651	925,277
Term Loan B
Debt Instrument [Line Items]
Total debt	407,889	408,458
Convertible Notes
Debt Instrument [Line Items]
Total debt	68,977	67,878
Equipment financing and mortgages
Debt Instrument [Line Items]
Total debt	49,783	47,594
Other indebtedness
Debt Instrument [Line Items]
Total debt	3,514	6,264
2017 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Total debt	495,508	495,271
2020 Revolver
Debt Instrument [Line Items]
Total debt	$ 0	$ 0

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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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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