Description of Business and Significant Accounting Policies (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Significant Accounting Policies [Line Items]
Revenue	$ 155,399								$ 583,290	$ 515,160	$ 509,208
Revenue		$ 139,005	$ 149,413	$ 139,473	$ 132,871	$ 123,566	$ 133,691	$ 125,032	583,290	515,160	509,208
Cost of revenue									494,077	437,417	427,181
Total gross profit	23,309	21,667	22,959	21,278	18,292	19,199	22,573	17,679	89,213	77,743	82,027
Restructuring charges									1,639	2,930	3,317
Gain on change in fair value of contingent consideration, net									677	4,438	1,620
Operating Income (Loss)									28,010	19,605	22,911
Interest Expense											3,132
Other income (expense) (including interest income of $50 in 2019, $8 in 2018 and $43 in 2017)									417	(1,897)	(90)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest									22,369	14,763	19,689
Income tax expense									7,180	4,927	6,798
Net Income (Loss) Attributable to Parent	$ 9,495	$ 2,141	$ 3,219	$ 334	$ 385	$ 3,244	$ 3,575	$ 2,632	$ 15,189	$ 9,836	$ 12,891
Weighted Average Number of Shares Outstanding, Basic									16,827	16,608	16,748
Weighted Average Number of Shares Outstanding, Diluted									16,861	16,696	16,873
Basic earnings per share (in dollars per share)	$ 0.56	$ 0.13	$ 0.19	$ 0.02	$ 0.02	$ 0.20	$ 0.22	$ 0.16	$ 0.90	$ 0.59	$ 0.77
Diluted earnings per share (in dollars per share)	$ 0.56	$ 0.13	$ 0.19	$ 0.02	$ 0.02	$ 0.20	$ 0.22	$ 0.16	$ 0.90	$ 0.59	$ 0.76
Prepaid expenses and other current assets	$ 19,115				$ 19,048				$ 19,115	$ 19,048
Deferred tax assets	1,121				1,077				1,121	1,077
Contract with Customer, Liability	23,234				23,704				23,234	23,704
Retained earnings	131,228				116,039				131,228	116,039
Assets	448,902				434,738				448,902	434,738
Accounts payable and accrued expenses	92,332				93,254				92,332	93,254
Liabilities and Equity	$ 448,902				$ 434,738				$ 448,902	$ 434,738
Leasehold Improvements [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Estimated Useful Lives									Shorter of asset life or term of lease
Building Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									40 years
Building Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									5 years
Machinery, Equipment, and Furniture and Fixtures [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									10 years
Machinery, Equipment, and Furniture and Fixtures [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									3 years
Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption												$ 396
Accounting Standards Update 2014-09 [Member] | Retained Earnings
Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption												$ 396
Single Automotive Customer [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage									13.00%
Sales Revenue, Net [Member] | Automotive Industry [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage									28.00%	23.00%