CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Preferred Stock, dividend rate	7.50%	7.50%
Common Stock
Amount surrendered for tax purposes, equity-based compensation awards	$ 465	$ 721
Shares for tax withholding, equity-based compensation awards	42,357	94,073
Preferred Stock | Series B 7.50% Cumulative Redeemable - Liquidation Preference $25.00 per Share
Preferred Stock, dividend rate	7.50%	7.50%
Preferred Stock, liquidation preference per share (in dollars per share)	$ 25.00	$ 25.00