Long-Term Debt (Schedule Of Interest Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Long-Term Debt [Abstract]
Cash payments for interest	$ 61,587	$ 61,873	$ 62,609
Commitment and other fees paid	2,484	2,767	1,905
Amortization of debt issuance costs and premium on senior secured notes	3,362	2,934	2,878
Change in accrued interest	563	(269)	129
Capitalized Interest	(139)	(349)	(354)
Other	107	86	40
Total interest expense	$ 67,964	$ 67,042	$ 67,207