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Marketable Investment Securities (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Unrealized Gains (Losses) on Available-For-Sale Securities    
Amortized Cost $ 1,201,166 $ 454,716
Unrealized Gains 502 0
Unrealized Losses (535) (216)
Total debt securities 1,201,133 454,500
Available-for-sale Securities, Debt Maturities [Abstract]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 711,200  
Available For Sale Securities Debt Maturities After Next Rolling Twelve Months Fair Value 490,000  
Corporate bonds    
Unrealized Gains (Losses) on Available-For-Sale Securities    
Amortized Cost 1,028,554 368,291
Unrealized Gains 502 0
Unrealized Losses (535) (208)
Total debt securities 1,028,521 368,083
Other debt securities    
Unrealized Gains (Losses) on Available-For-Sale Securities    
Amortized Cost 172,612 86,425
Unrealized Gains 0 0
Unrealized Losses 0 (8)
Total debt securities $ 172,612 $ 86,417