Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 32,772	$ 34,771
Finite-lived intangible assets, accumulated amortization	(27,181)	(24,213)
Finite-lived intangible assets, net	5,591	10,558
Indefinite-lived intangible assets, gross carrying amount	476	493
Total intangible assets, gross carrying amount	33,248	35,264
Total intangible assets, net	6,067	11,051
Technology-based intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	5,766	5,077
Finite-lived intangible assets, accumulated amortization	(3,873)	(3,600)
Finite-lived intangible assets, net	1,893	1,477
Customer-related intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	25,158	28,069
Finite-lived intangible assets, accumulated amortization	(21,962)	(19,638)
Finite-lived intangible assets, net	3,196	8,431
Employment related intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	1,848	1,625
Finite-lived intangible assets, accumulated amortization	(1,346)	(975)
Finite-lived intangible assets, net	502	650
Permits and licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross carrying amount	$ 476	$ 493