Intangible Assets Intangible Assets (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 49,238
Finite-Lived Intangible Assets, Amortization Expense, Year Two	91,008
Finite-Lived Intangible Assets, Amortization Expense, Year Three	72,467
Finite-Lived Intangible Assets, Amortization Expense, Year Four	48,104
Finite-Lived Intangible Assets, Amortization Expense, Year Five	31,274
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	33,443
Finite-Lived Intangible Assets, Amortization Expense, Year Two	62,836
Finite-Lived Intangible Assets, Amortization Expense, Year Three	52,282
Finite-Lived Intangible Assets, Amortization Expense, Year Four	34,637
Finite-Lived Intangible Assets, Amortization Expense, Year Five	19,464
Customer Relationships [Member]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	8,182
Finite-Lived Intangible Assets, Amortization Expense, Year Two	16,399
Finite-Lived Intangible Assets, Amortization Expense, Year Three	13,906
Finite-Lived Intangible Assets, Amortization Expense, Year Four	11,750
Finite-Lived Intangible Assets, Amortization Expense, Year Five	10,689
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	7,613
Finite-Lived Intangible Assets, Amortization Expense, Year Two	11,773
Finite-Lived Intangible Assets, Amortization Expense, Year Three	6,279
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1,717
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 1,121