Stock-Based Compensation (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Director Group [Member]
Summary of stock option grants
Grantee Type	Director group	Director group
No. of Options Granted	51,276	65,801
Vesting Period	1 year
Vesting Period		1 year or less
Weighted Average Exercised Price	$ 7.53	$ 7.23
Weighted Average Grant Date Fair Value	$ 3.97	$ 4.06
Director group [Member]
Summary of stock option grants
Grantee Type		Director group
No. of Options Granted		16,237
Vesting Period		3 years
Weighted Average Exercised Price		$ 6.32
Weighted Average Grant Date Fair Value		$ 3.98
Employee group [Member]
Summary of stock option grants
Grantee Type	Employee group	Employee group
No. of Options Granted	642,250	140,000
Vesting Period	3 years	2 years
Weighted Average Exercised Price	$ 7.61	$ 6.09
Weighted Average Grant Date Fair Value	$ 4.15	$ 3.72
Employee group [Member]
Summary of stock option grants
Grantee Type		Employee group
No. of Options Granted		475,064
Vesting Period		3 years
Weighted Average Exercised Price		$ 7.38
Weighted Average Grant Date Fair Value		$ 4.33