Savings and Retirement Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Contribution Pension [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred Compensation Arrangement with Individual, Employer Contribution Per Employee, Matching Percent	50.00%	50.00%	50.00%
Deferred Compensation Arrangement with Individual, Employer Contribution	$ 365,000	$ 596,000	$ 282,000
Non-Qualified Deferred Compensation Plan [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability	5,900,000	5,700,000
Maximum [Member] | Defined Contribution Pension [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred Compensation Arrangement with Individual,Eligible Contribution By Participants Amount	$ 16,500	$ 16,500	$ 16,500
Deferred Compensation Arrangement with Individual, Employer Contribution, Percent Of Eligible Earnings	5.00%	5.00%	5.00%