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Segment Information - Components of Adjusted Capital Expenditures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting [Abstract]        
Additions to property and equipment $ 66,051 $ 56,812 $ 127,963 $ 106,470
Capitalized implementation costs 15,234 9,944 29,561 17,597
Adjusted Capital Expenditures $ 81,285 $ 66,756 $ 157,524 $ 124,067