Employee Benefit Plans Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 years	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 13,817	$ 11,684	$ 12,120
Retirement Age To Be Attained To Receive Postretirement Benefits	65
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 Contribution Plan Employer Contributions Maximum Percentage Of Eligible Employee’s Covered Compensation	5.00%
Defined Contribution Plans Number Of Years To Vest	5
401k Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	11,983	11,271	11,378
Defined Contribution Plan Employer Contributions Maximum Percentage Of Eligible Employee’s Covered Compensation	5.00%
Defined Contribution Plans Percentage Of Plan Vested	100.00%
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,834	$ 413	$ 742