Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at federal statutory rate	$ (663)	$ 9,929	$ 5,639
Nondeductible executive compensation	756	1,165	768
Nondeductible goodwill impairment	2,401	0	0
Other nondeductible expenses	1,506	1,216	1,368
Stock-based compensation	(248)	(786)	472
Different rates on earnings of foreign operations	463	912	(2,139)
Dividend taxes on unremitted earnings	1,609	3,023	1,506
U.S. tax on foreign earnings	1,215	333	0
Change in valuation allowance	1,272	(790)	240
State tax expense (benefit), net	430	1,298	(283)
Net impact of Tax Act	0	(1,613)	(3,387)
Other items, net	1,047	310	709
Total provision for income taxes	$ 9,788	$ 14,997	$ 4,893