Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Senior Secured Credit Facility - Revolver and Term Loan (Details)

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Long-Term Debt - Senior Secured Credit Facility - Revolver and Term Loan (Details)
Jun. 30, 2015
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 28, 2019
bank
Jun. 27, 2019
May 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Line of Credit Facility [Line Items]                
Total funded debt to EBITDA covenant ratio, maximum         3.00      
Total funded debt to EBITDA ratio, minimum       3.25        
Long-term debt value, carrying value   $ 343,093,000         $ 253,873,000  
Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Long-term debt value, carrying value   50,073,000         1,696,000 $ 185,000,000
Current borrowing capacity     $ 115,000,000          
Additional borrowing capacity (up to) $ 25,000,000              
Remaining borrowing capacity   $ 29,144,000            
Commitment fee percentage 0.375%              
Stated interest rate (percent)   4.70%            
Periodic principal payment $ 1,219,000              
Maximum amount of company's consolidated stockholders' equity eligible for investment in or loan to non-core subsidiaries 0.49              
Minimum debt service coverage ratio 1.5              
Revolving Credit Facility | As of the end of each fiscal quarter ending September 30, 2016, December 31, 2016, March 31, 2017 and June 30, 2017                
Line of Credit Facility [Line Items]                
Maximum EBITDA requirement 3.25              
Revolving Credit Facility | Federal Funds Effective Rate                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 0.50%              
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 1.50%              
Revolving Credit Facility | Minimum | Base Rate                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 0.50%              
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 2.00%              
Revolving Credit Facility | Maximum                
Line of Credit Facility [Line Items]                
Current borrowing capacity $ 20,000,000              
Revolving Credit Facility | Maximum | Base Rate                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 0.25%              
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 1.75%              
Term Loan | Notes payable to banks                
Line of Credit Facility [Line Items]                
Long-term debt value, carrying value   $ 62,563,000         $ 41,500,000  
Original principal amount     65,000,000          
Debt interest rate (percent)   3.99%            
Line of Credit | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Line of credit facility, number of banks | bank       3        
Maximum borrowing capacity     115,000,000     $ 85,000,000    
Term Loan                
Line of Credit Facility [Line Items]                
Long-term debt, gross     $ 65,000,000     $ 40,000,000    
Letter of Credit                
Line of Credit Facility [Line Items]                
Long-term debt value, carrying value   $ 13,090,000