Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000		50,000,000
Preferred stock, dividend rate, percentage	8.75%	8.75%	8.75%
Preferred stock, liquidation preference, value	$ 25		$ 25
Preferred stock, shares issued (in shares)	0		1,610,000
Preferred stock, shares outstanding (in shares)	0		1,610,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	450,000,000		450,000,000
Common stock, shares issued (in shares)	23,687,664		23,687,664
Common stock, shares outstanding (in shares)	23,687,664		23,687,664