Profit Sharing Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Compensation Arrangements [Abstract]
Maximum percentage of compensation employee is allowed to contribute	15.00%
Matching contributions	$ 8.1	$ 7.2	$ 7.2
Value of shares authorized to repurchase for ESOP allocation	$ 0