Stock-Based Compensation (Details 1) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Director Group [Member]
Summary of nonvested stock awards granted
Vesting Period		1 year or less
Vesting Period	1 year
Weighted Average Grant Date Fair Value	$ 3.97	$ 4.06
Director Group [Member] | 2008 Equity Incentive Plan [Member] | Restricted Stock and Restricted Stock Units [Member]
Summary of nonvested stock awards granted
Grantee Type	Director group	Director group
No. of Shares Granted	51,276	65,801
Vesting Period		1 year or less
Vesting Period	1 year
Weighted Average Grant Date Fair Value	$ 7.53	$ 7.23
Director group [Member]
Summary of nonvested stock awards granted
Vesting Period		3 years
Weighted Average Grant Date Fair Value		$ 3.98
Director group [Member] | 2008 Equity Incentive Plan [Member] | Restricted Stock and Restricted Stock Units [Member]
Summary of nonvested stock awards granted
Grantee Type		Director group
No. of Shares Granted		17,237
Vesting Period		3 years
Weighted Average Grant Date Fair Value		$ 6.34
Employee group [Member]
Summary of nonvested stock awards granted
Vesting Period	3 years	2 years
Weighted Average Grant Date Fair Value	$ 4.15	$ 3.72
Employee group [Member] | 2008 Equity Incentive Plan [Member] | Restricted Stock and Restricted Stock Units [Member]
Summary of nonvested stock awards granted
Grantee Type		Employee group
No. of Shares Granted		60,000
Vesting Period		2 years
Weighted Average Grant Date Fair Value		$ 6.09
Employee group [Member]
Summary of nonvested stock awards granted
Vesting Period		3 years
Weighted Average Grant Date Fair Value		$ 4.33
Employee group [Member] | 2008 Equity Incentive Plan [Member] | Restricted Stock and Restricted Stock Units [Member]
Summary of nonvested stock awards granted
Grantee Type	Employee group	Employee group
No. of Shares Granted	471,286	455,064
Vesting Period	3 years	3 years
Weighted Average Grant Date Fair Value	$ 7.65	$ 7.41