EQUITY STRUCTURE AND ACCOUNTS - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
AOCI Attributable to Parent [Roll Forward]
Balance at the beginning of the year	$ (3,556)
Other comprehensive income (loss)	8,519	$ (36,545)	$ 18,016
Exchange of capital for common stock			0
Exchange of noncontrolling interest for common stock	0	0	0
Balance at the end of the year	1,365	(3,556)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent [Roll Forward]
Balance at the beginning of the year	(3,556)	15,656	0
Other comprehensive income (loss)	3,420	(20,046)	488
Exchange of capital for common stock			14,874
Exchange of noncontrolling interest for common stock	1,202	645	324
Rebalancing of ownership percentage between Company and Operating Partnership	299	189	(30)
Balance at the end of the year	1,365	(3,556)	15,656
Accumulated Other Comprehensive Income of Noncontrolling Interests
AOCI Attributable to Parent [Roll Forward]
Balance at the beginning of the year	(2,839)	14,494	12,134
Other comprehensive income (loss)	5,099	(16,499)	17,528
Exchange of capital for common stock			(14,874)
Exchange of noncontrolling interest for common stock	(1,202)	(645)	(324)
Rebalancing of ownership percentage between Company and Operating Partnership	(299)	(189)	30
Balance at the end of the year	759	(2,839)	14,494
Total Accumulated Other Comprehensive Income
AOCI Attributable to Parent [Roll Forward]
Balance at the beginning of the year	(6,395)	30,150	12,134
Other comprehensive income (loss)	8,519	(36,545)	18,016
Exchange of capital for common stock			0
Exchange of noncontrolling interest for common stock	0	0	0
Rebalancing of ownership percentage between Company and Operating Partnership	0	0	0
Balance at the end of the year	$ 2,124	$ (6,395)	$ 30,150