Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings per share
Weighted average shares outstanding									10,073,304	10,393,766	10,302,525
Shares attributable to stock options and restricted stock									309,583	345,408	343,579
Weighted average shares attributable to stock options and restricted stock									10,382,887	10,739,174	10,646,104
Net earnings per share:
Basic	$ (0.06)	$ 0.61	$ 0.21	$ 0.40	$ (0.67)	$ 0.56	$ 0.39	$ 0.76	$ 1.18	$ 1.04	$ 2.96
Diluted	$ (0.06)	$ 0.60	$ 0.21	$ 0.39	$ (0.67)	$ 0.54	$ 0.38	$ 0.73	$ 1.14	$ 1.01	$ 2.87