Quarterly Consolidated Financial Data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Consolidated Financial Data (unaudited) [Abstract]
Revenues	$ 49,591	$ 46,960	$ 43,018	$ 41,649	$ 44,485	$ 44,044	$ 46,059	$ 41,650	$ 181,218	$ 176,238	$ 218,486
Gross Profit	25,655	24,960	23,304	21,569	22,873	22,470	23,515	21,874	95,488	90,732	115,675
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	2,510	2,835	(10,995)	(1,041)	419	37	1,332	(255)	(6,691)	1,533	29,407
Net Income (Loss) Attributable to Parent	$ 1,494	$ (998)	$ (4,412)	$ (724)	$ 2,054	$ 252	$ 759	$ 393	$ (4,640)	$ 3,458	$ 43,865
Earnings Per Share, Basic	$ 0.05	$ (0.03)	$ (0.13)	$ (0.02)	$ 0	$ 0	$ 0	$ 0	$ (0.14)	$ 0.11	$ 1.36
Earnings Per Share, Diluted	$ 0.04	$ (0.03)	$ (0.13)	$ (0.02)	$ 0	$ 0	$ 0	$ 0	$ (0.14)	$ 0.10	$ 1.34
Weighted Average Number of Shares Outstanding, Basic	32,882	33,237	33,240	33,092	32,951	32,897	32,567	32,523	33,124	32,783	32,226
Weighted Average Number of Shares Outstanding, Diluted	33,504	33,237	33,240	33,092	33,539	33,426	33,155	33,239	33,124	33,388	32,853