Unaudited Condensed Consolidated Statement of Equity - USD ($) $ in Thousands	Total	Stockholders' Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2015	$ 221,697	$ 220,775	$ 205	$ 194,437	$ 26,133	$ 922
Beginning Balance, Shares at Dec. 31, 2015			20,543,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,575	1,695			1,695	(120)
Noncontrolling interest distribution	(725)					725
Stock-based compensation expense	1,742	1,742		1,742
Shares net settled with the Company to satisfy minimum employee personal income tax liabilities resulting from share based compensation plans	(647)	(647)		(647)
Excess tax provision from stock-based compensation	(97)	(97)		(97)
Shares issued through stock plans	0	0	$ 2	(2)
Shares issued through stock plans, shares			168,822
Ending balance at Jun. 30, 2016	223,545	223,468	$ 207	195,433	27,828	77
Ending Balance, Shares at Jun. 30, 2016			20,711,952
Beginning balance at Dec. 31, 2016	$ 244,624	244,523	$ 207	197,161	47,155	101
Beginning Balance, Shares at Dec. 31, 2016	20,712,166		20,712,166
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 2,353	2,363			2,363	(10)
Stock-based compensation expense	1,306	1,306		1,306
Shares net settled with the Company to satisfy minimum employee personal income tax liabilities resulting from share based compensation plans	(584)	(584)		(584)
Shares issued through stock plans	102	102	$ 2	100
Shares issued through stock plans, shares			163,500
Ending balance at Jun. 30, 2017	$ 247,801	$ 247,710	$ 209	$ 197,983	$ 49,518	$ 91
Ending Balance, Shares at Jun. 30, 2017	20,875,666		20,875,666