CONSOLIDATED CONDENSED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Preferred stock - cash dividends declared per share (in dollars per share)	$ 1,550	$ 1,550
Common stock - cash dividends declared per share (in dollars per share)	$ 0.12	$ 0.09
Common stock repurchased under share repurchase program	$ 2,185	$ 2,016