Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details)

v3.3.1.900
Stockholders' Equity Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Unrealized Gains $ 405,177 $ 891,820
Available-for-sale Securities, Unrealized Losses (46,116) (36,031)
Accumulated other comprehensive income $ 359,061 $ 855,789