Basis of Presentation and Principles of Consolidation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accounts payable	$ 2,920	$ (27,390)
Net cash flows from operating activities		94,587
Purchases of property and equipment	(20,709)	(26,940)
Net cash flows from investing activities		(36,609)
Purchases of property and equipment included in ending accounts payable	2,025	7,240
As Reported [Member]
Accounts payable		(27,672)
Net cash flows from operating activities		94,305
Purchases of property and equipment		(26,658)
Net cash flows from investing activities		(36,327)
Purchases of property and equipment included in ending accounts payable		13,120
Adjustment [Member]
Accounts payable		282
Net cash flows from operating activities		282
Purchases of property and equipment		(282)
Net cash flows from investing activities		(282)
Purchases of property and equipment included in ending accounts payable		$ (5,880)