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Geographic Information (Tables)
12 Months Ended
Dec. 31, 2014
Segments, Geographical Areas [Abstract]  
Revenues By Geographic Areas
Revenues
2014
 
2013
 
2012
United States
$
3,308,226

 
2,951,673

 
2,798,124

Canada
238,590

 
227,756

 
218,570

Other foreign countries
186,691

 
146,677

 
116,883

 
$
3,733,507

 
3,326,106

 
3,133,577

Long-Lived Assets By Geographic Areas
Long-Lived Assets
2014
 
2013
 
2012
United States
$
725,189

 
632,783

 
495,609

Canada
37,580

 
22,572

 
15,954

Other foreign countries
13,068

 
11,968

 
17,613

 
$
775,837

 
667,323

 
529,176