Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 1,021,023	$ 834,476
Less: Current maturities	99,504	124,054
Long-term debt, net	921,519	710,422
Term Loan B
Debt Instrument [Line Items]
Total debt	409,027
Convertible Notes
Debt Instrument [Line Items]
Total debt	66,803	182,292
Equipment financing and mortgages
Debt Instrument [Line Items]
Total debt	43,819	39,159
Other indebtedness
Debt Instrument [Line Items]
Total debt	6,335	4,660
2017 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Total debt	495,039	494,365
2020 Revolver
Debt Instrument [Line Items]
Total debt	$ 0
2017 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Total debt		$ 114,000

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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