Defined Contribution Bonus and Profit Sharing Plans Schedule of Bonus and Profit Sharing Plans Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Bonus and Profit Sharing Plans and Awards Expense	$ 25,297	$ 28,926	$ 46,782