Common Stock and Stock Compensation (Details Textual) (USD $)	12 Months Ended			1 Months Ended		5 Months Ended			12 Months Ended		1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012 2007 Plan [Member]	May 31, 2011 2007 Plan [Member]	May 31, 2012 2007 Plan [Member]	Dec. 31, 2012 2007 Plan [Member]	Dec. 31, 2007 2007 Plan [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Stock Options [Member] 2007 Plan [Member]	Mar. 18, 2011 Odd Lot Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount											$ 1,000,000
Stock Repurchased During Period, Shares											4,868
Treasury Stock Acquired, Weighted-Average Cost Per Share											$ 26.01
Stock Repurchased and Retired During Period, Value											127,000
Shares authorized								525,000
Additional shares authorized					200,000
Shares available for grant							289,606
Ratio of restricted stock unit grants that reduce the number of shares available for issuance				100.00%		200.00%
Term of award										10 years
Period from termination of employment to exercise awards										90 days
Exercises in period, intrinsic value	$ 100,000	$ 0	$ 3,600,000
Granted, weighted average grant date fair value	$ 7.42	$ 13.72	$ 8.70
Award vesting period									3 years