Segment and Geographic Area Information Geographic Area Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 2,001,527	$ 2,000,401	$ 1,639,012
Percent of total operating revenues	100.00%	100.00%	100.00%
Property and equipment, net	$ 4,503,319	$ 4,215,063
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	$ 1,142,141	$ 1,143,056	$ 1,188,084
Percent of total operating revenues	57.10%	57.10%	72.50%
Property and equipment, net	$ 3,353,296	$ 3,202,963
Percent of total property and equipment	74.40%	76.00%
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 222,586	$ 242,952	$ 313,270
Percent of total operating revenues	11.10%	12.10%	19.10%
Property and equipment, net	$ 634,148	$ 465,123
Percent of total property and equipment	14.10%	11.00%
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 94,623	$ 98,759	$ 116,677
Percent of total operating revenues	4.70%	5.00%	7.10%
Property and equipment, net	$ 237,328	$ 230,706
Percent of total property and equipment	5.30%	5.50%
U.K. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 378,551	$ 340,747	$ 0
Percent of total operating revenues	18.90%	17.00%	0.00%
Property and equipment, net	$ 264,954	$ 303,210
Percent of total property and equipment	5.90%	7.20%
Netherlands [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 101,837	$ 119,421	$ 17,693
Percent of total operating revenues	5.10%	6.00%	1.10%
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 61,789	$ 55,466	$ 3,288
Percent of total operating revenues	3.10%	2.80%	0.20%
Property and equipment, net	$ 13,593	$ 13,061
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	$ 859,386	$ 857,345	$ 450,928
Percent of total operating revenues	42.90%	42.90%	27.50%
Property and equipment, net	$ 1,150,023	$ 1,012,100
Percent of total property and equipment	25.60%	24.00%