BUSINESS ACQUISITION (Fair Values and Useful Lives of Intangible Assets Acquired) (Details) - GNP $ in Thousands	Jan. 06, 2017 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Assets subject to amortization, fair value	$ 123,220
Assets subject to amortization, weighted average useful life	15 years 2 months 12 days
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Assets subject to amortization, fair value	$ 85,000
Assets subject to amortization, weighted average useful life	13 years
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Assets subject to amortization, fair value	$ 38,200
Assets subject to amortization, weighted average useful life	20 years
Non-compete agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Assets subject to amortization, fair value	$ 20
Assets subject to amortization, weighted average useful life	3 years