Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt	$ 956,177	$ 761,504
Less: Current maturities	14,414	16,767
Long-term debt, net	941,763	744,737
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt	176,760	171,481
Equipment Financing And Mortgages [Member]
Debt Instrument [Line Items]
Total debt	42,961	50,904
Other Indebtedness [Member]
Debt Instrument [Line Items]
Total debt	7,521	4,598
2017 Senior Notes [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	493,935	493,521
2017 Credit Facility [Member] \| Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 235,000	$ 41,000

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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