Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets			$ 3,600	$ 5,000	$ 5,500
Impairment of Intangible Assets, Finite-lived	$ 13,800	$ 100	$ 18,121	0	$ 70
LATAM SEF [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	600
EMEA [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	$ 13,200
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets			14 years
Amortization of intangible assets			$ 64,500	47,800
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets			13 years
Amortization of intangible assets			$ 2,000	$ 1,800
Patents
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets			9 years