Employee Benefits (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Compensation And Retirment Disclosure [Abstract]
Periodic pension cost recognized in period	$ 500,000	$ 965,000	$ 1,500,000	$ 2,900,000
Pension contribution for current period	0	0	0	0
Pension Contributions, Maximum Allowable	23,000,000		23,000,000
Pension Contributions Minimum Required	$ 0		$ 0