Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (shares)	31,156,000	9,561,000
Common stock, shares outstanding (shares)	31,156,000	9,561,000
Series B
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, per share liquidation value (usd per share)	$ 29	$ 29
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (shares)	44,000	44,000
Preferred stock, shares outstanding (in shares)	44,258	44,258
Series E
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, redemption shares (in shares)	0	1,551,000