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Segment Information - Components of Adjusted Capital Expenditures (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting [Abstract]        
Additions to property and equipment $ 89,639 $ 75,108 $ 254,232 $ 203,071
Capitalized implementation costs 21,309 20,081 64,577 49,642
Adjusted Capital Expenditures $ 110,948 $ 95,189 $ 318,809 $ 252,713