Employee Benefit Programs (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
SERP contribution	$ 1,693,000	$ 915,000	$ 234,000
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer contributions	$ 1,031,000	$ 594,000	$ 561,000
Board of Director's [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
SERP contribution percentage	100.00%
Officer's [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
SERP contribution percentage	50.00%
SERP Vesting Period	5