BUSINESS ACQUISITION BUSINESS ACQUISITION (Details) - USD ($)		3 Months Ended
	Nov. 17, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Nov. 16, 2016
Business Acquisition
Initial cash consideration to acquire business	$ 80,700,000
Contingent consideration range, maximum					$ 45,000,000
Purchase price consideration on acquisition date	$ 103,800,000
Contingent consideration on acquisition date		$ 31,800,000			23,100,000
Current contingent consideration		19,399,000		$ 0
Non-current contingent consideration		12,947,000		23,600,000
Change in fair value of contingent consideration		8,746,000	$ 0
Goodwill		56,457,000		$ 56,457,000
Acquisition-related costs		100,000
Pro forma revenue		110,293,000
Pro forma net income from continuing operations		5,445,000
Iron Horse Holdings, LLC [Member]
Business Acquisition
Non-current contingent consideration		12,400,000
Accounts receivable		3,538,000
Iintangible assets with definite lives, net		55,400,000
Goodwill		52,450,000
Accounts payable and accrued liabilities		(7,638,000)
Total purchase price		$ (103,750,000)
Earnout Payment for One Contingent Earnout [Member]
Business Acquisition
Contingent consideration range, minimum					0
Contingent consideration range, maximum					$ 22,500,000