Quarterly Consolidated Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Consolidated Financial Data (unaudited) [Abstract]
Revenues	$ 54,076	$ 61,641	$ 62,701	$ 54,362	$ 51,057	$ 58,597	$ 59,466	$ 52,570	$ 232,780	$ 221,690	$ 181,218
Gross Profit	27,864	32,449	34,193	29,045	26,644	31,912	31,884	28,966	123,551	119,406	95,488
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	6,744	12,970	10,593	19,561	4,179	10,880	8,656	3,097	49,868	26,812	(6,691)
Net Income (Loss) Attributable to Parent	$ 6,126	$ 9,286	$ 7,601	$ 13,939	$ 2,883	$ 7,198	$ 6,027	$ 1,848	$ 36,952	$ 17,956	$ (4,640)
Earnings Per Share, Basic	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1.19	$ 0.57	$ (0.14)
Earnings Per Share, Diluted	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 1.16	$ 0.56	$ (0.14)
Weighted Average Number of Shares Outstanding, Basic	31,085	30,988	30,779	30,957	31,016	31,526	31,663	31,928	31,128	31,408	33,124
Weighted Average Number of Shares Outstanding, Diluted	32,018	31,459	31,754	31,654	32,075	32,204	32,339	32,549	31,790	32,166	33,124