Employee Benefit Plans Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Retirement Age To Be Attained To Receive Postretirement Benefits	65
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 11,684	$ 12,120	$ 12,792
Retirement Age Needed To Be Attained For Years Of Service To Scale to initiate	40
Deferred Profit Sharing [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Employer Contributions Maximum Percentage Of Eligible Employee’s Covered Compensation	5.00%
Defined Benefit Plans Number Of Years To Vest	5
401k Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	11,271	11,378	11,118
Defined Benefit Plan Employer Contributions Maximum Percentage Of Eligible Employee’s Covered Compensation	5.00%
Defined Benefit Plans Percentage Of Plan Vested	100.00%
Defined Benefit Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 413	$ 742	$ 1,674