Financial Commitments (Reconciliation Of Outstanding Debt Balance To Reported Debt Balance) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized Discount and Issuance Cost	$ (63,297)	$ (6,697)
Total debt	800,521	817,684
Revolver [Member]
Debt Instrument [Line Items]
Outstanding Long-Term Debt	154,000	158,000
Unamortized Discount and Issuance Cost	(5,930)	(2,185)
Total debt	148,070	155,815
Term Loan [Member]
Debt Instrument [Line Items]
Outstanding Long-Term Debt	87,500	223,750
Unamortized Discount and Issuance Cost	(3,589)	(1,630)
Total debt	83,911	222,120
Senior Notes [Member]
Debt Instrument [Line Items]
Outstanding Long-Term Debt	300,000	300,000
Unamortized Discount and Issuance Cost	(2,384)	(2,882)
Total debt	297,616	297,118
Convertible Notes [Member]
Debt Instrument [Line Items]
Outstanding Long-Term Debt	200,000
Unamortized Discount and Issuance Cost	(51,394)
Total debt	$ 148,606