Derivatives (Summary Of The Fair Value Of The Equity Index Put Options Found On The Company's Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Option Indexed to Issuer's Equity [Line Items]
Equity index put option liability	$ 37,083	$ 35,423
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	$ 37,083	$ 35,423