Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 967,984	$ 1,025,465
Less: Current maturities	28,029	100,188
Long-term debt, net	939,955	925,277
Term Loan B
Debt Instrument [Line Items]
Total debt	406,835	408,458
Convertible Notes
Debt Instrument [Line Items]
Total debt	0	67,878
Equipment financing and mortgages
Debt Instrument [Line Items]
Total debt	54,381	47,594
Other indebtedness
Debt Instrument [Line Items]
Total debt	10,774	6,264
2017 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Total debt	495,994	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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