CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Held for Investment, Fair Value, Total	$ 391,867	$ 414,470
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	46,994,545	47,032,259
Common stock, shares outstanding	46,983,165	46,917,735