Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investments at Fair Value	$ 108,230	$ 110,066
Treasury Stock [Member]
Treasury Stock, Shares	(186,218,042)	(171,695,908)
Common Stock [Member]
Common Stock, Par Value	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	2,010,000,000	2,010,000,000
Common Stock, Shares, Issued	743,577,187	736,531,771
Common Stock, Shares, Outstanding	557,359,145	564,835,863