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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 8) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other Income (Expense)    
Marketable investment securities - gains (losses) on sales/exchanges $ 5,637 $ 557
Marketable investment securities - unrealized gains (losses) on investments accounted for at fair value 4,276 4,266
Derivative financial instruments - net realized gains (losses) (5,304) 8,358
Marketable investment securities - other-than-temporary impairments (6,130) (1,919)
Other (3,668) 138
Total $ (5,189) $ 11,400