Employee Benefit Programs (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
SERP contribution	$ 915,000	$ 234,000	$ 1,170,000
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer contributions	$ 594,000	$ 561,000	$ 525,000
Board of Director's
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
SERP contribution percentage	100.00%
Officer contributions
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
SERP contribution percentage	50.00%
Vesting period	5