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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2016	Dec. 31, 2015
FAIR VALUE MEASUREMENTS
Corporate & municipal bonds and money market funds		$ 21,870	$ 12,615
Property plant and equipment at fair value		560
Impairment charge recorded to reduce the carrying value of assets to fair value			183
Gearing
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value			506
Impairment charge recorded to reduce the carrying value of assets to fair value		0
Gearing equipment
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value		353	506
Level 3 | Gearing
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value			506
Recurring | Corporate & municipal bonds and money market funds
FAIR VALUE MEASUREMENTS
Corporate & municipal bonds and money market funds		5,049	8,001
Recurring | Level 2 | Corporate & municipal bonds and money market funds
FAIR VALUE MEASUREMENTS
Corporate & municipal bonds and money market funds		5,049	8,001
Nonrecurring
FAIR VALUE MEASUREMENTS
Total assets at fair value		6,417	12,964
Nonrecurring | Gearing
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value		353
Nonrecurring | Services
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value		455	3,343
Nonrecurring | Clintonville, WI facility
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value			554
Impairment charge recorded to reduce the carrying value of assets to fair value	$ 288
Additional asset impairment charges			186
Nonrecurring | Gearing Cicero Ave. facility | Gearing
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value		560	560
Nonrecurring | Level 2
FAIR VALUE MEASUREMENTS
Total assets at fair value		5,049	8,001
Nonrecurring | Level 3
FAIR VALUE MEASUREMENTS
Total assets at fair value		1,368	4,963
Nonrecurring | Level 3 | Gearing
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value		353
Nonrecurring | Level 3 | Services
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value		455	3,343
Nonrecurring | Level 3 | Clintonville, WI facility
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value			554
Nonrecurring | Level 3 | Gearing Cicero Ave. facility | Gearing
FAIR VALUE MEASUREMENTS
Property plant and equipment at fair value		$ 560	$ 560

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