Segment and Geographic Area Information Geographic Area Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 2,000,401	$ 1,639,012	$ 1,568,643
Percent of total operating revenues	100.00%	100.00%	100.00%
Property and equipment, net	$ 4,215,063	$ 3,788,482
Percent of total property and equipment	100.00%	100.00%
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 1,143,056	$ 1,188,084	$ 1,100,334
Percent of total operating revenues	57.10%	72.50%	70.20%
Property and equipment, net	$ 3,202,963	$ 3,003,299
Percent of total property and equipment	76.00%	79.30%
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 242,952	$ 313,270	$ 324,796
Percent of total operating revenues	12.10%	19.10%	20.70%
Property and equipment, net	$ 465,123	$ 506,154
Percent of total property and equipment	11.00%	13.40%
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 98,759	$ 116,677	$ 128,838
Percent of total operating revenues	5.00%	7.10%	8.20%
Property and equipment, net	$ 230,706	$ 266,305
Percent of total property and equipment	5.50%	7.00%
U.K. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 340,747	$ 0	$ 0
Percent of total operating revenues	17.00%	0.00%	0.00%
Property and equipment, net	$ 303,210	$ 0
Percent of total property and equipment	7.20%	0.00%
Netherlands [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 119,421	$ 17,693	$ 12,687
Percent of total operating revenues	6.00%	1.10%	0.80%
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 55,466	$ 3,288	$ 1,988
Percent of total operating revenues	2.80%	0.20%	0.10%
Property and equipment, net	$ 13,061	$ 12,724
Percent of total property and equipment	0.30%	0.30%
Non-US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 857,345	$ 450,928	$ 468,309
Percent of total operating revenues	42.90%	27.50%	29.80%
Property and equipment, net	$ 1,012,100	$ 785,183
Percent of total property and equipment	24.00%	20.70%