Earnings Per Share - Basic and Diluted Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income - Basic and Diluted	$ 11,041	$ 8,440	$ 23,058	$ 16,205
Weighted average common shares outstanding - Basic	54,645	51,086	54,299	49,841
Assumed conversions:
Incremental common shares from warrants	0	1,429	243	1,421
Incremental common shares from stock options	878	1,174	916	1,167
Incremental common shares from restricted stock units	10	24	15	16
Weighted average common shares outstanding - Diluted	55,533	53,713	55,473	52,445
Basic earnings per common share	$ 0.20	$ 0.17	$ 0.42	$ 0.33
Diluted earnings per common share	$ 0.20	$ 0.16	$ 0.42	$ 0.31