Summary of Significant Accounting Policies - Adjustments Made to the Consolidated Balance Sheet Following Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	$ 25,572	$ 29,759	$ 0
Inventories, net	144,350	138,759	162,589
Prepaid expenses and other current assets	11,638	11,513	11,687
Deferred income tax assets	1,833	10,485	7,913
Accounts payable and other current liabilities	279,856	337,035	332,935
Deferred income taxes	930	4,545	4,423
Retained earnings	282,788	270,864	266,780
As reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	0		0
Inventories, net	164,974		162,589
Prepaid expenses and other current assets	11,610		11,687
Deferred income tax assets	1,889		7,913
Accounts payable and other current liabilities	278,106		332,935
Deferred income taxes			4,423
Retained earnings	279,087		$ 266,780
ASU 2014-09 | Adjustments due to ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	25,572	29,759
Inventories, net	(20,624)	(23,830)
Prepaid expenses and other current assets	28	(174)
Deferred income tax assets	(56)	2,572
Accounts payable and other current liabilities	1,750	4,100
Deferred income taxes		122
Retained earnings	$ 3,701	$ 4,084