Net Income per Share of Common Stock (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator for earnings per share:
Net income that is available to common shareholders	$ 28,459	$ 6,966	$ 23,641
Denominator for basic earnings per share:
Weighted average shares outstanding	21,216,780	20,875,959	20,169,638
Effect of stock options and restricted stock units	525,393	439,252	492,557
Effect of warrants	0	0	145,882
Total effect of dilutive securities	525,393	439,252	638,439
Denominator for diluted earnings per share:
Adjusted weighted average shares and assumed conversions	21,742,173	21,315,211	20,808,077
Basic earnings per share	$ 1.34	$ 0.33	$ 1.17
Diluted earnings per share	$ 1.31	$ 0.33	$ 1.14