QUARTERLY CONSOLIDATED FINANCIAL DATA (UNAUDITED) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 90,246	$ 104,877	$ 130,261	$ 137,225	$ 79,233	$ 90,570	$ 111,052	$ 122,228	$ 462,609	$ 403,083	$ 358,086
Gross margin	45,853	53,128	67,691	71,356	40,785	46,527	56,911	59,807	238,028	204,030
Net income	$ 3,806	$ 7,309	$ 12,085	$ 2,943	$ 5,308	$ 5,076	$ 8,703	$ 224	$ 26,143	$ 19,311	$ 7,370
Basic income per common share (in Dollars per Share)	$ 0.13	$ 0.25	$ 0.42	$ 0.10	$ 0.18	$ 0.18	$ 0.30	$ 0.01	$ 0.90	$ 0.67	$ 0.26
Diluted income per common share (in Dollars per Share)	$ 0.13	$ 0.25	$ 0.41	$ 0.10	$ 0.18	$ 0.17	$ 0.30	$ 0.01	$ 0.89	$ 0.66	$ 0.25