ACQUISITIONS (Fair Values and Useful Lives of Intangible Assets Acquired) (Details) - Continuum $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated fair value of intangible assets acquired	$ 14,850
Favorable lease
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	11 years 11 months
Estimated fair value of intangible assets acquired	$ 5,900
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	6 years 7 months
Estimated fair value of intangible assets acquired	$ 5,800
Contract royalties
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	8 years
Estimated fair value of intangible assets acquired	$ 1,900
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	5 years
Estimated fair value of intangible assets acquired	$ 1,250