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LONG-TERM DEBT - (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 28, 2017
Dec. 02, 2017
Dec. 31, 2016
Mar. 17, 2015
Senior Unsecured Floating Rate Notes, Due December 31, 2027 [Member]          
Debt Instrument [Line Items]          
Deferred financing costs $ 377,000     $ 0  
Senior Unsecured Floating Rate Notes, Due December 31, 2027 [Member] | Unsecured Debt [Member] | First two years after issuance [Member]          
Debt Instrument [Line Items]          
Redemption price, percentage 102.00%        
Maturity period of debt 2 years        
Senior Unsecured Floating Rate Notes, Due December 31, 2027 [Member] | Unsecured Debt [Member] | Third through fifth year after issuance [Member]          
Debt Instrument [Line Items]          
Redemption price, percentage 101.00%        
Senior Unsecured Floating Rate Notes, Due December 31, 2027 [Member] | Unsecured Debt [Member] | After the fifth year after issuance [Member]          
Debt Instrument [Line Items]          
Redemption price, percentage 100.00%        
Senior Unsecured Floating Rate Notes, Due December 31, 2027 [Member] | Unsecured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt instrument face amount   $ 25,000,000.0      
Basis spread on variable rate 7.00%        
Default spread on variable rate 8.00%        
Senior Unsecured Fixed Rate Notes, Due July 1, 2022 [Member]          
Debt Instrument [Line Items]          
Deferred financing costs $ 302,000     0  
Senior Unsecured Fixed Rate Notes, Due July 1, 2022 [Member] | Unsecured Debt [Member]          
Debt Instrument [Line Items]          
Debt instrument face amount     $ 20,000,000.0    
Redemption price, percentage 102.00%        
Interest rate percentage     8.375%    
Default rate, increase in fixed rate 0.50%        
Other Consolidated Debt from VIE, Due March 17, 2021 [Member]          
Debt Instrument [Line Items]          
Deferred financing costs $ 70,000     $ 91,000  
Other Consolidated Debt from VIE, Due March 17, 2021 [Member] | Other debt [Member] | Monarch Delaware Holdings LLC [Member]          
Debt Instrument [Line Items]          
Debt instrument face amount         $ 5,000,000.0
Interest rate percentage         6.00%