ACQUISITIONS (Purchase Price Allocation) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition
Goodwill		$ 236,981	$ 199,609
Headwater Companies
Business Acquisition
Cash	$ 2,700
Receivables	32,600
Inventory	56,000
Other current assets	4,900
Total current assets	96,200
Property, plant, and equipment	9,800
Intangible assets	5,700
Goodwill	34,000
Other assets	200
Total assets	145,900
Accounts payable	(22,800)
Accrued liabilities and other current liabilities	(10,800)
Current maturities of long-term debt	(31,600)
Total current liabilities	(65,200)
Long-term debt	(2,000)
Other long-term liabilities	(700)
Total liabilities	(67,900)
Total	78,000
Less: Fair value of original equity interest	(20,600)
Total purchase price	$ 57,400