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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Other Income Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Other Income (Expense)    
Marketable investment securities - gains (losses) on sales/exchanges $ 2,272 $ 78,653
Derivative financial instruments - net realized and/or unrealized gains (losses)   (11,673)
Other 2,473 (63)
Total $ 4,745 $ 66,917