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Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accounting Policies [Abstract]
Net foreign exchange transaction gains (loss)	$ (400)	$ (800)	$ (1,231)	$ (1,659)
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset impairment	870	41,032	870	41,032
Goodwill impairment	1,389	$ 45,390	1,389	$ 45,390
Goodwill	$ 261,757		$ 261,757		$ 260,715
Fyfe
Finite-Lived Intangible Assets [Line Items]
Percentage of fair value in excess of carrying value		45.00%		45.00%
Goodwill impairment		$ 45,400
Goodwill					$ 9,600
Fyfe \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset impairment		3,400
Fyfe \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset impairment		20,800
Fyfe \| Patents
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible asset impairment		$ 16,800