Financial Commitments (Reconciliation of Outstanding Debt Balance to Reported Debt Balance) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 1,021,023	$ 834,476
Term Loan B
Debt Instrument [Line Items]
Outstanding Debt	425,000
Unamortized Discount and Issuance Costs	(15,973)
Total debt	409,027
Convertible Notes
Debt Instrument [Line Items]
Outstanding Debt	69,918	200,000
Unamortized Discount and Issuance Costs	(3,115)	(17,708)
Total debt	66,803	182,292
2017 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Outstanding Debt	500,000	500,000
Unamortized Discount and Issuance Costs	(4,961)	(5,635)
Total debt	$ 495,039	$ 494,365

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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