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Segment Information - Components of Adjusted Capital Expenditures (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting [Abstract]        
Additions to property and equipment $ 75,401 $ 89,639 $ 242,811 $ 254,232
Capitalized implementation costs 16,524 21,309 47,968 64,577
Adjusted Capital Expenditures $ 91,925 $ 110,948 $ 290,779 $ 318,809