Net Income Per Share (Computation Of Basic And Diluted Net Income Per Share) (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
Numerator (basic and diluted):
Net income	$ 3,098	$ 4,113	$ 4,587	$ 6,444	$ 5,320	$ 7,751	$ 3,992	$ 4,636	$ 18,242	$ 21,699	$ 10,499
Accretion of redemption premium											(2,301)
Net income attributable to common stockholders									18,242	21,699	8,198
Add back: accretion of redemption premium related to dilutive redeemable preferred stock											(260)
Net income attributable to common stockholders for diluted EPS									$ 18,242	$ 21,699	$ 7,938
Denominator (basic):
Weighted average common shares outstanding	35,393	35,234	35,117	34,831	34,638	34,134	33,473	32,226	35,145	33,626	18,138
Denominator (diluted):
Dilutive stock options									1,185	1,651	1,377
Weighted average common shares from stock warrants											403
Weighted average common shares from preferred stock											4,496
Diluted weighted average common shares outstanding	36,517	36,152	36,340	36,303	36,313	35,785	35,047	33,841	36,330	35,277	24,414
Net income per share attributable to holders of common stock:
Basic	$ 0.09	$ 0.12	$ 0.13	$ 0.19	$ 0.15	$ 0.23	$ 0.12	$ 0.14	$ 0.52	$ 0.65	$ 0.45
Diluted	$ 0.08	$ 0.11	$ 0.13	$ 0.18	$ 0.15	$ 0.22	$ 0.11	$ 0.14	$ 0.50	$ 0.62	$ 0.33