Long-Term Debt and Interest Expense (Schedule Of Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Long-Term Debt and Interest Expense [Abstract]
Cash payments for interest			$ 49,628	$ 49,689
Commitment and other fees paid			1,818	1,719
Amortization of debt issuance costs and discount or premium on notes			2,637	2,232
Change in accrued interest			(3,076)	(3,413)
Other			(62)	26
Total interest expense	$ 17,242	$ 16,828	$ 50,945	$ 50,253