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Reportable Operating Segments (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Revenues and total assets by geographic area          
Revenue $ 515,291 $ 445,013 $ 985,365 $ 855,008  
% of Revenue 100.00% 100.00% 100.00% 100.00%  
Total Assets 1,055,006   1,055,006   1,050,693
United States
          
Revenues and total assets by geographic area          
Revenue     974,735 845,461  
% of Revenue     98.90% 98.90%  
Total Assets 1,043,406   1,043,406   1,039,322
Non-United States
          
Revenues and total assets by geographic area          
Revenue     10,630 9,547  
% of Revenue     1.10% 1.10%  
Total Assets $ 11,600   $ 11,600   $ 11,371