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EQUITY INCENTIVES - Stock Options and Stock Appreciation Rights (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2016
May 31, 2010
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity incentives          
Increase in number of shares authorized 5,000,000 4,500,000      
Authorized shares 14,600,000 9,600,000      
Shares available for issuance     5,975,856    
Total unrecognized compensation cost related to share-based compensation arrangements     $ 800    
Expected weighted-average recognition period in years     2 years 4 months 24 days    
Contractual term     5 years    
Maximum          
Equity incentives          
Vesting period     3 years    
Stock Options and Stock Appreciation Rights          
Equity incentives          
Contractual term     5 years    
Aggregate intrinsic value of outstanding and exercisable     $ 0    
Weighted average remaining contractual term of outstanding and exercisable     1 year 6 months    
Total intrinsic value of options exercised     $ 0 $ 0 $ 0
Stock Options and Stock Appreciation Rights | Minimum          
Equity incentives          
Vesting period     0 years    
Stock Options and Stock Appreciation Rights | Maximum          
Equity incentives          
Vesting period     3 years    
Stock Appreciation Rights          
Equity incentives          
Aggregate intrinsic value of SARS exercised     $ 0 $ 0 $ 0