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INCOME TAXES - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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									$ 11,286	$ 16,644	$ 15,782
Non-controlling interest									(1,114)	(2,887)	(2,893)
Foreign tax rate differential									(2,716)	(6,621)	(3,074)
Over (under) provided in prior periods									(4,683)	(18)	1,069
Nondeductible expenses									1,610	929	1,134
Goodwill Impairment											2,622
Capitalized transactions costs									62	53	3,138
Change in tax reserves									10,657	4,433	2,561
State Taxes, net of federal benefit									1,674	1,075	1,853
Change in valuation allowance									1,539	6,137	(7,292)
Foreign tax credit expiration											4,179
Refund Claim for Domestic Production Deduction									235	(3,382)
Tax Cuts and Jobs Act of 2017									(148)	(10,639)
Capital loss									15	(6,990)
Other, net									453	(75)	2,081
Total income tax expense (benefit)	$ 5,851	$ 7,010	$ 2,088	$ 3,921	$ (6,181)	$ (884)	$ 2,596	$ 3,128	$ 18,870	$ (1,341)	$ 21,160

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