LONG-TERM DEBT - Payments Applicable to Reduction of Principal (Details) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Payments applicable to reduction of principal amounts
2018	$ 7,300,000
2020	75,000,000
2021	66,000,000
Thereafter	30,000,000
Total Long-Term Debt - Face Value	178,300,000
Current maturities
Face amount of debt	178,300,000
UBS Mortgage Note Payable
Payments applicable to reduction of principal amounts
Total Long-Term Debt - Face Value	7,300,000	$ 7,300,000
Current maturities
Face amount of debt	$ 7,300,000