Goodwill and Other Intangible Assets, Net - Components of other intangible assets, net (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 464,769	$ 210,003
Finite-Lived Intangible Assets, Accumulated Amortization	(72,472)	(61,361)
Intangible Assets, Gross (Excluding Goodwill)	496,909	242,143
Intangible Assets Accumulated Amortization	(72,472)	(61,361)
Customer Relationships [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	423,923	195,076
Finite-Lived Intangible Assets, Accumulated Amortization	(62,522)	(53,298)
Other Intangible Assets [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	40,846	14,927
Finite-Lived Intangible Assets, Accumulated Amortization	(9,950)	(8,063)
Trade Names [Member]
Goodwill [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 32,140	$ 32,140