Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Total current assets	$ 145,159	$ 279,761
Total property and equipment, net	2,255,147	1,794,215
Investment in subsidiaries	0	0
Other assets	40,528	36,784
Total Assets	2,440,834	2,110,760
Current liabilities	373,526	322,835
Long-term liabilities	1,105,429	946,321
Total shareholders’ equity	961,879	841,604
Total Liabilities and Shareholders’ Equity	2,440,834	2,110,760
Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Total current assets	(1,995,596)	(1,709,026)
Total property and equipment, net	26,666	20,807
Investment in subsidiaries	(209,557)	(61,619)
Other assets	(75,607)	(32,902)
Total Assets	(2,254,094)	(1,782,740)
Current liabilities	(1,995,597)	(1,709,026)
Long-term liabilities	(61,949)	(23,585)
Total shareholders’ equity	(196,548)	(50,129)
Total Liabilities and Shareholders’ Equity	(2,254,094)	(1,782,740)
Parent Company [Member] | Reportable Legal Entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Total current assets	1,884,949	1,820,069
Total property and equipment, net	21,518	2,797
Investment in subsidiaries	209,557	61,619
Other assets	116,135	69,686
Total Assets	2,232,159	1,954,171
Current liabilities	245,703	201,486
Long-term liabilities	1,037,586	922,571
Total shareholders’ equity	948,870	830,114
Total Liabilities and Shareholders’ Equity	2,232,159	1,954,171
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Total current assets	255,806	168,718
Total property and equipment, net	2,179,872	1,768,553
Investment in subsidiaries	0	0
Other assets	0	0
Total Assets	2,435,678	1,937,271
Current liabilities	2,096,326	1,828,314
Long-term liabilities	129,792	47,335
Total shareholders’ equity	209,560	61,622
Total Liabilities and Shareholders’ Equity	2,435,678	1,937,271
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Total current assets	0	0
Total property and equipment, net	27,091	2,058
Investment in subsidiaries	0	0
Other assets	0	0
Total Assets	27,091	2,058
Current liabilities	27,094	2,061
Long-term liabilities	0	0
Total shareholders’ equity	(3)	(3)
Total Liabilities and Shareholders’ Equity	$ 27,091	$ 2,058