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Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Realized gains on marketable investment securities and other investments          
Realized gains on marketable investment securities and other investments $ 17,967 $ 232 $ 37,430 $ 128,227  
Fair value of marketable investment securities in a loss position          
Less than 12 months 409,178   409,178   275,587
12 months or more 131,225   131,225   12,963
Total 540,403   540,403   288,550
Unrealized losses on marketable investment securities in a loss position          
Less than 12 months (421)   (421)   (288)
12 or more (401)   (401)   (19)
Total $ (822)   $ (822)   $ (307)