QUARTERLY SUPPLEMENTARY FINANCIAL INFORMATION (UNAUDITED) (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
Continuing Operations [Abstract]
Total revenues	$ 293,374	$ 298,055	$ 304,197	$ 305,539	$ 252,062	$ 291,910	$ 275,399	$ 250,795	$ 1,201,165	$ 1,070,166	$ 1,052,737
Income (loss) before income taxes	(28,699)	(4,528)	(4,571)	54,677	(41,512)	12,598	(1,809)	21,573	16,879	(9,150)	15,650
Net income (loss)	$ (23,163)	$ (2,342)	$ (4,196)	$ 44,521	$ (29,336)	$ 11,070	$ 157	$ 20,364	$ 14,820	$ 2,255	$ 44,870
Basic earnings (loss) per share (in dollars per share)	$ (0.93)	$ (0.09)	$ (0.17)	$ 1.77	$ (1.17)	$ 0.44	$ 0.01	$ 0.82	$ 0.59	$ 0.09	$ 1.79
Diluted earnings (loss) per share (in dollars per share)	$ (0.93)	$ (0.09)	$ (0.17)	$ 1.74	$ (1.17)	$ 0.43	$ 0.01	$ 0.80	$ 0.58	$ 0.09	$ 1.75
Discontinued Operations [Abstract]
Total revenues	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 24,755	$ 0	$ 24,755
Income (loss) before income taxes	0	0	0	0	0	0	0	(1,349)	0	(1,349)
Net income (loss)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (1,912)	$ 0	$ (1,912)	$ 6,153
Basic earnings (loss) per share (in dollars per share)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (0.08)	$ 0	$ (0.08)	$ 0.24
Diluted earnings (loss) per share (in dollars per share)	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ (0.07)	$ 0	$ (0.07)	$ 0.24

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