Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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)	32,717,000	32,560,000
Common stock, shares outstanding (shares)	32,717,000	32,560,000
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)	44,000	44,000