ACQUISITIONS AND DISPOSALS (Summary of Purchase Price and Net Assets Acquired) (Details) - USD ($) $ in Thousands	Apr. 03, 2017	Feb. 28, 2017	Sep. 30, 2018	Dec. 31, 2017
Cash:
Held in escrow account			$ 28,750	$ 28,750
Fair value of net assets acquired:
Goodwill			106,323	$ 107,954	[1]
Nowait, Inc
Cash:
Distributed to stockholders		$ 31,892
Held in escrow account		7,945
Total purchase consideration		39,837
Fair value of net assets acquired:
Cash and cash equivalents		1,004
Intangible assets		12,670
Goodwill		25,959
Other assets		1,065
Total assets acquired		40,698
Liabilities assumed		(861)
Total liabilities assumed		(861)
Net assets acquired		$ 39,837
Turnstyle Analytics Inc
Cash:
Distributed to stockholders	$ 16,648
Held in escrow account	3,093		$ 3,000
Total purchase consideration	19,741
Fair value of net assets acquired:
Cash and cash equivalents	30
Intangible assets	4,252
Goodwill	16,048
Other assets	250
Total assets acquired	20,580
Deferred tax liability	(450)
Liabilities assumed	(389)
Total liabilities assumed	(839)
Net assets acquired	$ 19,741

[1] As of January 1, 2018, the Company adopted Accounting Standards Update 2014-09, "Revenue from Contracts with Customers (Topic 606)" ("ASC 606"), using the full retrospective method. Accordingly, the Company has recast certain amounts in the prior period presented. See Note 1 below for additional discussion.