Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 60,363	$ 32,772
Finite-lived intangible assets, accumulated amortization	(30,900)	(27,181)
Finite-lived intangible assets, net	29,463	5,591
Indefinite-lived intangible assets, gross carrying amount	542	476
Indefinite-lived intangible assets, other intangible asset, net	541	476
Total intangible assets, gross carrying amount	60,905	33,248
Total intangible assets, net	30,004	6,067
Technology-based intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	15,596	5,766
Finite-lived intangible assets, accumulated amortization	(4,427)	(3,873)
Finite-lived intangible assets, net	11,169	1,893
Customer-related intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	42,903	25,158
Finite-lived intangible assets, accumulated amortization	(24,679)	(21,962)
Finite-lived intangible assets, net	18,224	3,196
Employment related intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	1,864	1,848
Finite-lived intangible assets, accumulated amortization	(1,794)	(1,346)
Finite-lived intangible assets, net	70	502
Permits and licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross carrying amount	542	476
Indefinite-lived intangible assets, other intangible asset, net	$ 541	$ 476