Derivatives (Summary Of The Fair Value Of The Equity Index Put Options Found On The Company's Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 52,247	$ 47,022
Equity Index Put Option Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 52,247	$ 47,022