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LONG-TERM DEBT - (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Mar. 05, 2019
Mar. 31, 2018
Feb. 28, 2018
Dec. 31, 2017
Dec. 29, 2017
Dec. 28, 2017
Dec. 02, 2017
Senior Unsecured Floating Rate Notes, Due December 31, 2027 [Member]                  
Debt Instrument [Line Items]                  
Deferred financing costs (less than) $ 348,000         $ 377,000      
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 (less than) $ 248,000         302,000      
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 (less than) $ 0         $ 70,000      
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        
Deferred financing costs (less than)       $ 100,000          
Subsequent Event [Member] | Senior Unsecured Fixed Rate Notes, Due 2029 [Member] | Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Debt instrument face amount     $ 100,000,000            
Interest rate percentage     7.50%            
Forecast [Member] | Subsequent Event [Member] | Senior Unsecured Fixed Rate Notes, Due 2029 [Member] | Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Debt instrument face amount   $ 100,000,000              
Interest rate percentage   7.50%