Goodwill and Other Intangible Assets, Net - Components of other intangible assets, net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 470,035	$ 210,003
Finite-Lived Intangible Assets, Accumulated Amortization	(80,125)	(61,361)
Intangible Assets, Gross (Excluding Goodwill)	502,175	242,143
Intangible Assets Accumulated Amortization	(80,125)	(61,361)
Customer Relationships [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	428,538	195,076
Finite-Lived Intangible Assets, Accumulated Amortization	(68,702)	(53,298)
Other Intangible Assets [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	41,497	14,927
Finite-Lived Intangible Assets, Accumulated Amortization	(11,423)	(8,063)
Trade Names [Member]
Goodwill [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 32,140	$ 32,140