Commitments And Contingencies - Additional Information (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 28, 2014 sqft	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Total rent expense, net of sublease income		$ 9.7	$ 12.3	$ 13.5
Sublease income			0.7	1.3
Subsequent Event [Line Items]
Square Feet of Office Space Vacated	47,592
Subsequent Event [Member]
Subsequent Event [Line Items]
Operating Leases, Future Reduction in Lease Payments	$ 6.3