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LONG-TERM DEBT - Narrative (Details) - USD ($)
Mar. 07, 2019
Mar. 06, 2019
Mar. 05, 2019
Mar. 31, 2019
Dec. 31, 2018
Apr. 30, 2018
Debt Instrument [Line Items]            
Cash and cash equivalents       $ 68,300,000 $ 87,300,000  
Revolving Credit Facility | Amended 2016 Revolving Credit Facility, Tranche B            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 41,500,000.0   41,500,000.0   $ 41,500,000.0
Potential increase of maximum borrowing capacity   5.00%        
Covenant terms, liquidity $ 35,000,000 $ 50,000,000 $ 35,000,000      
Covenant terms, percentage of maximum 10.00% 15.00% 10.00%      
Remaining borrowing capacity $ 37,300,000     0    
Borrowing Base $ 41,300,000     37,500,000    
Covenant terms, consolidated fixed charge coverage ratio   100.00%        
Covenant terms, liquidity threshold, consecutive business days     20 days      
Foreign Subsidiaries            
Debt Instrument [Line Items]            
Cash and cash equivalents       $ 63,200,000