Employee Benefit Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefit Plan [Abstract]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	6000.00%
Defined Contribution Plan, Percentage of Participant's Contributions Matched by Employer	6000.00%
Defined Contribution Plan, Employer Matching Contribution, Percent	800.00%
Defined Contribution Plan, Employer Contributions	$ 321,000	$ 297,000	$ 302,000