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Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue $ 288,907 $ 265,855 $ 842,520 $ 771,940
United States [Member]
       
Revenue 237,259 218,313 694,670 626,019
Canada [Member]
       
Revenue 34,129 34,753 100,612 109,475
Other Geographical Location [Member]
       
Revenue $ 17,519 $ 12,789 $ 47,238 $ 36,446