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Fair Value of Financial Instruments (Available-for-sale securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value of Financial Instruments [Abstract]    
Amortized cost $ 455,084 $ 1,040,850
Gross unrealized gains (losses) 1,464 (2,712)
Fair market value $ 456,548 $ 1,038,138