Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,656,316	$ 1,687,150	$ 1,684,571	$ 1,610,737	$ 1,617,729	$ 1,634,540	$ 1,603,999	$ 1,563,017	$ 6,638,774	$ 6,419,285	$ 6,256,967
Long-lived assets	7,694,042				7,124,663				7,694,042	7,124,663	6,379,461
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									5,614,037	5,411,376	5,231,899
Long-lived assets	6,583,508				5,996,646				6,583,508	5,996,646	5,261,622
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									435,280	455,440	477,495
Long-lived assets	530,316				529,880				530,316	529,880	557,351
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									400,853	372,209	384,105
Long-lived assets	553,467				568,850				553,467	568,850	534,728
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									158,481	161,279	143,282
Long-lived assets	26,230				29,008				26,230	29,008	24,973
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									30,123	18,981	20,186
Long-lived assets	521				279				521	279	787
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,024,737	1,007,909	1,025,068
Long-lived assets	$ 1,110,534				$ 1,128,017				$ 1,110,534	$ 1,128,017	$ 1,117,839