Equity (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013
Equity [Abstract]
stock offering		11,100,000
Share Price			$ 29.50
Common Stock, Discount on Shares			$ 0.96
Equity Forward Sale Agreement, Settlement Threshold	10,400,000
equity forward sale agreement future settlement amount	284,000,000
Option Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value	$ 52,000,000
Net share settlement	1,603,711