Segment and Geographic Area Information Property and Equipment by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Property & equipment	$ 3,396,295	$ 1,643,589	$ 1,444,177
Percent of Total Property and Equipment	100.00%	100.00%	100.00%
United States [Member]
Segment Reporting Information [Line Items]
Property & equipment	2,487,782	993,665	892,295
Percent of Total Property and Equipment	73.20%	60.50%	61.80%
Australia [Member]
Segment Reporting Information [Line Items]
Property & equipment	629,602	523,468	443,827
Percent of Total Property and Equipment	18.50%	31.80%	30.70%
Canada [Member]
Segment Reporting Information [Line Items]
Property & equipment	263,828	110,719	91,434
Percent of Total Property and Equipment	7.80%	6.70%	6.30%
Europe [Member]
Segment Reporting Information [Line Items]
Property & equipment	15,083	15,737	16,621
Percent of Total Property and Equipment	0.50%	1.00%	1.20%
Total Non-United States
Segment Reporting Information [Line Items]
Property & equipment	$ 908,513	$ 649,924	$ 551,882
Percent of Total Property and Equipment	26.80%	39.50%	38.20%