Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 H	Dec. 31, 2011	Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Mandotory work hours per year	1,000
Mandatory 401(k) match	$ 0.25
Maximum annual employer 401(k) contribution	6.00%
Amount expensed for 401(k) contributions	620,000	721,000	732,000
Contributions to Supplemental Executive Retirement Plan	240,000	335,000	328,000
Accrued liability for plan	1,500,000	1,300,000
Increase in non-qualified deferred compensation plan	330,000	132,000	59,000
Aggregate payout under Profit Sharing Plan	894,000	786,000
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued liability for plan	$ 3,100,000	$ 2,900,000