Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,939,693	$ 1,848,529	$ 1,793,214	$ 1,748,163	$ 1,729,150	$ 1,724,418	$ 1,703,744	$ 1,629,672	$ 7,329,599	$ 6,786,984	$ 6,571,893
Long-lived assets:	9,131,966				8,893,592				9,131,966	8,893,592	8,899,705
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									6,378,784	5,892,384	5,603,697
Long-lived assets:	7,935,167				7,854,845				7,935,167	7,854,845	7,817,628
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									428,252	387,713	408,325
Long-lived assets:	623,576				532,403				623,576	532,403	504,027
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									321,375	339,420	391,339
Long-lived assets:	527,869				472,027				527,869	472,027	545,630
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									170,398	139,176	139,583
Long-lived assets:	44,997				33,979				44,997	33,979	31,993
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									30,790	28,291	28,949
Long-lived assets:	357				338				357	338	427
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									950,815	894,600	968,196
Long-lived assets:	$ 1,196,799				$ 1,038,747				$ 1,196,799	$ 1,038,747	$ 1,082,077