Subsequent Event Subsequent Event Details (Details) (Subsequent Event [Member], USD $)	Feb. 09, 2015
Subsequent Event [Member]
Subsequent Event [Line Items]
Modified Dutch Auction, Authorized Share Amount	3,652,968
Modified Dutch Auction, Authorized Amount	$ 200,000,000
Modified Dutch Auction, Minimum Share Price	$ 54.75
Modified Dutch Auction, Maximum Share Price	$ 58.50