Other Liabilities (Schedule Of Other Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Liabilities [Abstract]
Interest rate swaps, Current	$ 31,069	$ 23,117
Deferred revenue, Current	1,315	835
Asset Retirement Obligation, Current	3,166	2,834
Other, Current	47	434
Total, Current	35,597	27,220
Interest rate swaps, Noncurrent	34,509	84,973
Obligations associated with acquired unfavorable contracts, Noncurrent		964
Deferred revenue, Noncurrent	962	1,353
Other, Noncurrent	3,265	5,831
Total, Noncurrent	$ 38,736	$ 93,121