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SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Thousands									3 Months Ended	12 Months Ended
	Feb. 25, 2020 USD ($) $ / shares shares	Feb. 24, 2020 USD ($) item	Feb. 03, 2020 USD ($)	May 15, 2019 shares	Mar. 04, 2019 shares	May 15, 2018 shares	Feb. 27, 2018 shares	May 17, 2017 shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Feb. 28, 2019 USD ($)	Dec. 31, 2016 USD ($)
Subsequent Events
Dividends declared per share of common stock | $ / shares									$ 0.50	$ 0.50
Restricted cash									$ 6,045	$ 6,045	$ 4,947	$ 7,234		$ 8,242
Secured Debt | $495 Million Credit Facility
Subsequent Events
Maximum borrowing capacity									$ 495,000	$ 495,000	$ 495,000		$ 495,000
2015 EIP Plan | Restricted Stock Units
Subsequent Events
Granted (in shares) | shares				29,580	106,079	14,268	37,436	25,197		140,914	51,704	317,595
Vesting period of awards										3 years
2015 EIP Plan | Stock Options
Subsequent Events
Options to purchase (in shares) | shares					240,540		122,608			240,540	122,608	133,000
Vesting percentage of awards					33.33%		33.33%
Vesting period of awards					3 years		3 years
Subsequent Event
Subsequent Events
Number of vessels to be disposed | item		10
Dividends declared per share of common stock | $ / shares	$ 0.175
Dividend payable	$ 7,400
Subsequent Event | Genco Charger
Subsequent Events
Sale of assets		$ 5,150	$ 5,150
Broker commission (as a percent)		1.00%	1.00%
Subsequent Event | Secured Debt | $495 Million Credit Facility | Genco Charger
Subsequent Events
Restricted cash		$ 3,471
Period for which sales proceeds from vessels will remain as restricted cash		180 days
Subsequent Event | 2015 EIP Plan | RSUs and Stock Options
Subsequent Events
Vesting percentage of awards	33.33%
Vesting period of awards	3 years
Subsequent Event | 2015 EIP Plan | Restricted Stock Units
Subsequent Events
Granted (in shares) | shares	173,749
Subsequent Event | 2015 EIP Plan | Stock Options
Subsequent Events
Options to purchase (in shares) | shares	344,568
Exercise price (in dollars per share) | $ / shares	$ 7.06

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