BUSINESS ACQUISITIONS (Identifiable Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ / shares in Units, $ in Thousands			4 Months Ended	9 Months Ended
	Jul. 20, 2018	Nov. 22, 2017	Mar. 31, 2018	Dec. 31, 2018
Allocable purchase price:
Less: Cash acquired			$ 0	$ 1,496
Assets acquired and liabilities assumed:
Goodwill			$ 153,368	225,450
ESM Holdings Limited
Allocable purchase price:
Purchase consideration		$ 280,000
Less: Cash acquired		21,357
Purchase consideration		258,643
Assets acquired and liabilities assumed:
Property, plant and equipment, net				27,715
Equity affiliates		$ 10,830		2,030
Goodwill				162,168
Other current and non-current assets (including restricted cash)				150,718
Trade payables				(17,516)
Borrowings				(24,893)
Accrued expenses and other current liabilities				(107,939)
Non-controlling interests				(45,720)
Total purchase price				258,643
Aegis
Allocable purchase price:
Stock consideration (based on shares outstanding immediately prior the closing date)	16,226,392
Closing share price on July 20, 2018	$ 6.81
Purchase consideration	$ 110,502
Assets acquired and liabilities assumed:
Cash and cash equivalents	1,496
Other current assets	46,094
Property, plant and equipment, net	15,930
Identifiable intangible assets	28,960
Goodwill	63,282
Other non-current assets	3,204
Current liabilities	(21,485)
Non-current liabilities	(26,979)
Total purchase price	$ 110,502
Software | ESM Holdings Limited
Assets acquired and liabilities assumed:
Identifiable intangible assets				9,980
Customer relationships | ESM Holdings Limited
Assets acquired and liabilities assumed:
Identifiable intangible assets				52,600
Brand | ESM Holdings Limited
Assets acquired and liabilities assumed:
Identifiable intangible assets				$ 49,500