INCOME TAXES - Income Tax Reconciliation (Details) - USD ($) $ 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
Reconciliation from the tax computed at statutory income tax rates to the Company's income tax expense
Tax computed at statutory U.S. federal income tax rates									$ 1,275	$ 11,286	$ 16,644
Non-controlling interest									(648)	(1,114)	(2,887)
Foreign tax rate differential									(1,820)	(2,716)	(6,621)
Over (under) provided in prior periods									(244)	(4,683)	(18)
Nondeductible expenses									3,781	1,610	929
Capitalized transactions costs									19	62	53
Change in tax reserves									3,883	10,657	4,433
State Taxes, net of federal benefit									(429)	1,674	1,075
Change in valuation allowance									(35)	1,539	6,137
Investment tax credit									(1,215)
Refund Claim for Domestic Production Deduction										235	(3,382)
Tax Cuts and Jobs Act of 2017										(148)	(10,639)
Capital loss										15	(6,990)
Deferred income tax revaluation									(513)
Other, net									51	453	(75)
Total income tax expense (benefit)	$ 1,332	$ 1,834	$ (274)	$ 1,213	$ 5,851	$ 7,010	$ 2,088	$ 3,921	$ 4,105	$ 18,870	$ (1,341)