Long-Term Debt and Interest Expense (Schedule Of Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Long-Term Debt and Interest Expense [Abstract]
Cash payments for interest	$ 18,875	$ 18,933
Commitment and other fees paid	407	585
Amortization of debt issuance costs and discount or premium on notes	681	740
Change in accrued interest	(2,989)	(3,405)
Other	(111)	6
Total interest expense	$ 16,863	$ 16,859