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Equity (Details) $ / shares in Units, $ in Thousands							1 Months Ended				3 Months Ended			9 Months Ended		12 Months Ended
Equity (Details) $ / shares in Units, $ in Thousands	Oct. 31, 2018 $ / shares	Aug. 01, 2018 $ / shares	May 02, 2018 $ / shares	Feb. 21, 2018 $ / shares	Feb. 02, 2018 $ / shares	Jul. 14, 2016 USD ($)	Aug. 31, 2018 USD ($) item shares	Jul. 31, 2018 shares	May 31, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) shares	Sep. 30, 2018 Vote $ / shares shares	Mar. 31, 2018 USD ($) shares	Sep. 30, 2017 $ / shares	Sep. 30, 2018 USD ($) Vote $ / shares shares	Sep. 30, 2017 USD ($) $ / shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 shares	Dec. 31, 2015	Jun. 30, 2018 USD ($)
Common stock
Shares issued in connection with exchange of convertible debt notes (in shares)														74,322,000
Proceeds from issuance of shares under public offering \| $														$ 55,908	$ 76,225
Payment to internalize the management team and terminate the existing management agreement using the proceed from public offering \| $															$ 25,000
Noncontrolling Interest
Preferred stock, par value (in dollars per share) \| $ / shares											$ 0.01			$ 0.01		$ 0.01
OP Units redeemed by cash \| $														$ (6,845)
Distributions
Cash dividend declared (in dollars per share) \| $ / shares											$ 0.25		$ 0.18	$ 0.71	$ 0.53
Chief executive officer \| Restricted common stock
Deferred Compensation
Number of fully vested shares issued												63,584
Total grant date fair value \| $												$ 600
Vesting percentage												25.00%
Chief executive officer \| Restricted common stock \| First Anniversaries
Deferred Compensation
Vesting percentage												25.00%
Chief executive officer \| Restricted common stock \| Second Anniversaries
Deferred Compensation
Vesting percentage												25.00%
Chief executive officer \| Restricted common stock \| Third Anniversaries
Deferred Compensation
Vesting percentage												25.00%
Chief executive officer \| Performance-based restricted stock
Deferred Compensation
Granted of restricted stock units that vest at the end of four-year performance period (in shares)							294,985					381,503
Vesting period (in years)														4 years		4 years	4 years	4 years
Total grant date fair value \| $							$ 3,400					$ 800
Chief executive officer \| Employee compensation and benefits \| Restricted common stock
Deferred Compensation
Share-based compensation expense \| $												100
Chief executive officer \| Employee compensation and benefits \| Performance-based restricted stock
Deferred Compensation
Share-based compensation expense \| $							$ 200
Chief executive officer \| Employee compensation and benefits \| Performance-based restricted stock \| Maximum
Deferred Compensation
Share-based compensation expense \| $												$ 100
Employees \| Restricted common stock
Deferred Compensation
Number of fully vested shares issued										265,444
Total grant date fair value \| $										$ 2,300
Vesting percentage										33.00%
Employees \| Restricted common stock \| March, 2019
Deferred Compensation
Vesting percentage										33.00%
Employees \| Restricted common stock \| March 2020
Deferred Compensation
Vesting percentage										33.00%
Employees \| Employee compensation and benefits \| Restricted common stock
Deferred Compensation
Share-based compensation expense \| $										$ 800
8.25% Series A preferred stock
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)														8.25%	8.25%	8.25%
7.75% Series B preferred stock
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)														7.75%	7.75%	7.75%
8.50% Series C preferred stock
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)														8.50%	8.50%	8.50%
Common Stock
Common stock
Shares issued in connection with exchange of convertible debt notes (in shares)								6,820,196
Number of common stock sold under public offering (in shares)														6,452,700
Aggregate amount of debt securities, common stock, preferred stock, depositary shares and warrants filed under shelf registration statement \| $																			$ 500,000
Distributions
Cash dividend declared (in dollars per share) \| $ / shares	$ 0.27	$ 0.25	$ 0.25	$ 0.21
Common Stock \| Non-management members of the Board of Directors
Deferred Compensation
Number of fully vested shares issued										58,620
Common Stock \| Non-management members of the Board of Directors \| Selling and administrative expense
Deferred Compensation
Share-based compensation expense \| $										$ 500
Preferred Stock \| 8.25% Series A preferred stock
Distributions
Cash dividend declared on redeemable preferred stock (in dollars per share) \| $ / shares	$ 0.515625	0.515625	0.515625		$ 0.515625
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)	8.25%
Preferred Stock \| 7.75% Series B preferred stock
Distributions
Cash dividend declared on redeemable preferred stock (in dollars per share) \| $ / shares	$ 0.484375	0.484375	0.484375		0.484375
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)	7.75%
Preferred Stock \| 8.50% Series C preferred stock
Distributions
Cash dividend declared on redeemable preferred stock (in dollars per share) \| $ / shares	$ 0.53125	$ 0.53125	$ 0.53125		$ 0.53125
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)	8.50%
ACM Acquisition \| ACM / Our "Former Manager"
Noncontrolling Interest
Consideration in stock to be paid with operating partnership units (in shares)							577,185							14,873,236		5,780,348	21,230,769
Number of preferred stock shares paired with each OP units																	1
Number of partners in consideration \| item							2
OP units outstanding (in shares)											20,653,584			20,653,584
5.375% Convertible Notes
Common stock
Interest rate (as a percent)								5.375%			5.375%			5.375%
6.50% Convertible Notes
Common stock
Interest rate (as a percent)								6.50%			6.50%			6.50%
Operating Partnership Units
Noncontrolling Interest
Consideration in stock to be paid with operating partnership units (in shares)																	21,230,769
Value of operating partnership units issues as consideration \| $						$ 154,800
Conversion ratio for operating partnership units to common stock shares														1
Operating Partnership Units \| Special voting preferred shares
Noncontrolling Interest
Number of preferred stock shares paired with each OP units														1
Number of vote per share of Special Voting Preferred Shares \| Vote											1			1
Preferred stock, par value (in dollars per share) \| $ / shares											$ 0.01			$ 0.01
Voting power of outstanding stock (as a percent)														21.40%
Public offering \| Common Stock
Common stock
Number of common stock sold under public offering (in shares)									5,500,000
Issued price per share (in dollars per share) \| $ / shares									$ 8.72
Proceeds from issuance of shares under public offering \| $									$ 47,800
At-The-Market \| Common Stock
Common stock
Number of common stock sold under public offering (in shares)														952,700
Number of shares to issue and sell											7,500,000			7,500,000
Proceeds from issuance of shares under public offering \| $														$ 8,100
Number of shares available under an "At-The-Market" equity offering with JMP Securities LLC											6,500,000			6,500,000