Financial Commitments (Long-Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 15, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 970,244		$ 1,025,465
Debt, Current	36,941		100,188
Long-term debt, net	933,303		925,277
Term Loan B
Debt Instrument [Line Items]
Total debt	408,414		408,458
Current principal amount	422,875		423,938
Convertible Notes
Debt Instrument [Line Items]
Total debt	0		67,878
Current principal amount	0	$ 69,900	69,918
Equipment financing and mortgages
Debt Instrument [Line Items]
Total debt	48,781		47,594
Other indebtedness
Debt Instrument [Line Items]
Total debt	17,300		6,264
2017 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Total debt	495,749		495,271
Current principal amount	500,000		500,000
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, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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