ACCRUED AND OTHER LIABILITIES - Environmental Reserves (Details) $ in Thousands		3 Months Ended		6 Months Ended	12 Months Ended		18 Months Ended	24 Months Ended	42 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($) a	Jun. 30, 2017 USD ($)	Dec. 31, 2015 USD ($) a	Dec. 31, 2014 USD ($) a	Jun. 30, 2017 USD ($)	Dec. 31, 2015 USD ($) a	Jun. 30, 2017 USD ($)
Wetlands restoration
Environmental reserves
Estimated cost	$ 2,000	$ 2,000		$ 2,000
Accrued restoration cost			$ 1,700	950	$ 1,700		$ 950	$ 1,700	$ 950
Area of previously disposed land subject to remediation | a			148.4		148.4			148.4
Increase in accrual of remediation costs		$ 300
Environmental costs funded							1,100
Acres | a			148.4		148.4			148.4
Environmental Reserve for Monitoring Environmental Remediation Work Previously Performed
Environmental reserves
Additional environmental reserve accrued					$ 500	$ 110		$ 610
Environmental costs funded									446
Environmental reserve accrued				$ 164			$ 164		$ 164
Minimum | Wetlands restoration
Environmental reserves
Estimated cost			$ 1,700
Minimum | Environmental Reserve for Monitoring Environmental Remediation Work Previously Performed
Environmental reserves
Estimated cost					500
Maximum | Wetlands restoration
Environmental reserves
Estimated cost			$ 1,900
Maximum | Environmental Reserve for Monitoring Environmental Remediation Work Previously Performed
Environmental reserves
Estimated cost					$ 1,000
Acres | a						1