CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Preferred Stock, dividend rate (as a percent)	7.50%	7.50%
Common Stock
Amount surrendered for tax purposes, equity-based compensation awards	$ 169	$ 480
Shares for tax withholding, equity-based compensation awards	22,148	64,012
Preferred Stock | Series B 7.50% Cumulative Redeemable - Liquidation Preference $25.00 per Share
Preferred Stock, dividend rate (as a percent)	7.50%
Preferred Stock, Liquidation Preference per Share (in dollars per share)	$ 25.00