BUSINESS SEGMENT INFORMATION - Geographic (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment information:
Total revenues	$ 116,588	$ 293,240	$ 449,665	$ 986,412
United States
Segment information:
Total revenues	110,823	275,928	421,323	933,583
International
Segment information:
Total revenues	$ 5,765	$ 17,312	$ 28,342	$ 52,829