Segments and Operations by Geographic Area (Reconciliation of EBITDA to Income from Continuing Operations) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Reconciling Item [Line Items]
Interest expense, net	$ (12,666,000)	$ (9,446,000)	$ (34,549,000)	$ (27,883,000)
Depreciation			(103,111,000)	(65,767,000)
Income from continuing operations before provision for income taxes	81,633,000	59,576,000	170,608,000	130,186,000
Continuing Operations [Member]
Segment Reporting, Reconciling Item [Line Items]
EBITDA	132,100,000	91,700,000	308,300,000	223,200,000
Interest expense, net	(12,700,000)	(9,400,000)	(34,500,000)	(27,900,000)
Depreciation	(37,756,000)	(22,645,000)	(103,111,000)	(65,125,000)
Amortization	(5,800,000)	(2,800,000)	(15,200,000)	(8,500,000)
Continuing Operations [Member] | Property and Equipment [Member]
Segment Reporting, Reconciling Item [Line Items]
Depreciation	$ (32,000,000)	$ (19,800,000)	$ (87,900,000)	$ (56,600,000)