Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Earnings Per Share, Basic	$ 0.69	$ 0.49	$ 0.31
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	850,133	2,149,044	1,833,574
Earnings Per Share, Basic [Abstract]
Net income	$ 23,979	$ 16,178	$ 10,389
Weighted Average Number of Shares Outstanding, Basic	34,736,000	33,307,000	33,123,000
Earnings Per Share, Diluted [Abstract]
Net income	$ 23,979	$ 16,178	$ 10,389
Weighted Average Number of Shares Outstanding, Basic	34,736,000	33,307,000	33,123,000
Incremental Common Shares Attributable to Share-based Payment Arrangements	1,041,000	906,000	980,000
Weighted Average Number of Shares Outstanding, Diluted	35,777,000	34,213,000	34,103,000
Net income per share - diluted	$ 0.67	$ 0.47	$ 0.30