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Segment Information - Components of Adjusted Capital Expenditures (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting [Abstract]    
Additions to property and equipment $ 88,318 $ 75,472
Capitalized implementation costs 17,096 19,957
Adjusted Capital Expenditures $ 105,414 $ 95,429