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Derivatives (Summary Of The Change In Fair Value Of The Equity Index Put Option Contracts Found On The Company's Statement Of Operations And Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Option Indexed to Issuer's Equity [Line Items]
Net derivative gain (loss)	$ (1,661)	$ 15,285
Equity Index Put Option Contracts [Member] \| Derivatives Not Designated As Hedging Instruments [Member]
Option Indexed to Issuer's Equity [Line Items]
Net derivative gain (loss)	$ (1,661)	$ 15,285

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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