Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Long-Term Debt - Senior Secured Credit Facility - Revolver and Term Loan (Details)
Jun. 30, 2015
USD ($)
bank
Dec. 31, 2017
USD ($)
Jun. 01, 2017
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Line of Credit Facility [Line Items]            
Long-term debt value, carrying value   $ 202,168,000     $ 165,413,000  
Remaining borrowing capacity   38,928,000        
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Line of credit facility, number of banks | bank 2          
Additional borrowing capacity (up to) $ 25,000,000          
Current borrowing capacity $ 75,000,000          
Amount outstanding   $ 27,580,000     15,033,000  
Commitment fee percentage 0.375%          
Debt interest rate   5.00%        
Periodic principal payment $ 1,500,000          
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 [Member]            
Line of Credit Facility [Line Items]            
Maximum EBITDA requirement 2.75          
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            
Line of Credit Facility [Line Items]            
Additional borrowing capacity (up to)           $ 20,000,000
Current borrowing capacity     $ 75,000,000 $ 60,000,000   $ 30,000,000
Term loan | Notes payable to banks            
Line of Credit Facility [Line Items]            
Original principal amount $ 30,000,000          
Long-term debt value, carrying value   $ 22,500,000     $ 28,500,000  
Debt interest rate   3.45%