Stock-Based Compensation (Details 4) (USD $)	3 Months Ended
	Mar. 31, 2013
Summary of Stock Option Activity
Options outstanding, beginning balance, shares	1,099,106
Options Outstanding Granted	1,500
Options Outstanding Exercised	(10,194)
Options outstanding Expired or cancelled	(72,537)
Options outstanding Forfeited	(19,000)
Options outstanding, ending balance, shares	998,875
Options exercisable, ending balance, shares	957,356
Options outstanding, beginning balance, Weighted Average Exercise Price	$ 9.06
Weighted Average Exercise Price Granted	$ 7.71
Weighted Average Exercise Price Exercised	$ 7.19
Weighted Average Exercise Price Expired or Cancelled	$ 7.57
Weighted Average Exercise Price Forfeited	$ 6.30
Options outstanding, ending balance, Weighted Average Exercise Price	$ 9.24
Options outstanding, Exercisable at End of Year, Weighted Average Exercise Price	$ 9.35