Long-Term Debt (Schedule Of Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Long-Term Debt [Abstract]
Cash payments for interest			$ 31,612	$ 28,236
Commitment and other fees paid			893	807
Amortization of debt issuance costs and discount or premium on notes			1,404	1,290
Change in accrued interest			9	4
Capitalized Interest			(314)	(293)
Other			10	11
Total interest expense	$ 16,806	$ 14,832	$ 33,614	$ 30,055