Financial Commitments (Reconciliation Of Outstanding Debt Balance To Reported Debt Balance) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Outstanding Debt	$ 1,047,714
Unamortized Discounts and Issuance Costs	(22,249)
Total debt	1,025,465	$ 834,476
Convertible Debt
Debt Instrument [Line Items]
Outstanding Debt	69,918	200,000
Unamortized Discounts and Issuance Costs	(2,040)	(17,708)
Total debt	67,878	182,292
Term Loan B
Debt Instrument [Line Items]
Outstanding Debt	423,938
Unamortized Discounts and Issuance Costs	(15,480)
Total debt	408,458
2017 Senior Notes \| 2017 Senior Notes
Debt Instrument [Line Items]
Outstanding Debt	500,000	500,000
Unamortized Discounts and Issuance Costs	(4,729)	(5,635)
Total debt	$ 495,271	$ 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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 470
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-Section 50
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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
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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