Basis of Presentation and Significant Accounting Policies - New Guidance (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Receivables, net	$ 267,179	$ 257,425	$ 265,866
Inventories	189,109	170,819	165,336
Deferred tax liabilities	36,978	35,386	31,580
Retained earnings	$ 123,743	$ 116,611	123,375
ASU 2014-09 | Difference between revenue guidance in effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Receivables, net			(8,400)
Inventories			5,500
Deferred tax liabilities			(679)
Retained earnings			(2,279)
ASU 2016-16
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred tax liabilities			4,485
Retained earnings			$ (4,500)