Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 836,419	$ 834,476
Less: Current maturities	320,790	124,054
Long-term debt, net	515,629	710,422
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt	188,089	182,292
Equipment Financing And Mortgages [Member]
Debt Instrument [Line Items]
Total debt	44,917	39,159
Other Indebtedness [Member]
Debt Instrument [Line Items]
Total debt	8,603	4,660
2017 Senior Notes [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	494,810	494,365
2017 Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 100,000	$ 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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