EARNINGS PER SHARE - (Information Related to EPS Calculation) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net income	$ (1,001)	$ 30,043	$ 13,328	$ 31,925	$ 37,924	$ 23,847	$ (5,879)	$ 1,834	$ 74,295	$ 57,726	$ 166,623
Net income attributable to noncontrolling interests									(339)	(714)	1,781
Net income attributable to common stockholders	$ (1,100)	$ 29,758	$ 13,477	$ 31,821	$ 37,261	$ 23,365	$ (5,088)	$ 1,474	$ 73,956	$ 57,012	$ 168,404
Denominator:
Weighted average basic common shares outstanding (in shares)	43,190,000	43,134,000	43,113,000	43,106,000	43,075,000	43,066,000	42,573,000	42,976,000	43,136,000	43,036,000	41,364,000
Numerator:
Net income attributable to common stockholders	$ (1,100)	$ 29,758	$ 13,477	$ 31,821	$ 37,261	$ 23,365	$ (5,088)	$ 1,474	$ 73,956	$ 57,012	$ 168,404
Denominator:
Weighted average basic common shares outstanding (in shares)	43,190,000	43,134,000	43,113,000	43,106,000	43,075,000	43,066,000	42,573,000	42,976,000	43,136,000	43,036,000	41,364,000
Restricted stock and stock options (in shares)									168,000	201,000	279,000
Warrants (in shares)									4,000	0	1,446,000
Weighted average diluted common shares outstanding (in shares)	43,356,000	43,428,000	43,271,000	43,257,000	43,250,000	43,317,000	42,942,000	43,363,000	43,308,000	43,237,000	43,089,000
Basic income per share: (in dollars per share)	$ (0.03)	$ 0.69	$ 0.31	$ 0.74	$ 0.87	$ 0.54	$ (0.12)	$ 0.03	$ 1.71	$ 1.32	$ 4.07
Diluted income per share: (in dollars per share)	$ (0.03)	$ 0.69	$ 0.31	$ 0.74	$ 0.86	$ 0.54	$ (0.12)	$ 0.03	$ 1.71	$ 1.32	$ 3.91
Stock Options
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									379,608	425,908	313,500
Restricted Stock
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									235,894	205,979	161,155