Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 801,324	$ 736,276
Less: Current maturities	20,601	30,748
Long-term debt, net	780,723	705,528
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt	168,932	161,635
Equipment Financing And Mortgages [Member]
Debt Instrument [Line Items]
Total debt	56,227	76,820
Other Indebtedness [Member]
Debt Instrument [Line Items]
Total debt	4,846	5,087
2017 Senior Notes [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Total debt	493,319	$ 492,734
2017 Credit Facility [Member] \| Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 78,000

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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