Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ 334,030	$ 372,576	$ 416,080	$ 335,145
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	(31,060)	(28,837)	$ (12,769)	$ (4,373)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	(32,880)	(31,695)
Unrealized gain on hedging activity
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	1,876
Unrealized gain on hedging activity
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity		2,914
Pension and other postretirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' equity	$ (56)	$ (56)