Quarterly report pursuant to Section 13 or 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)
 9 Months Ended
Sep. 30, 2017
USD ($)
Rate
Jun. 01, 2017
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
bank
Line of Credit Facility [Line Items]            
Number of banks | bank           2
Maximum percentage of investment allowed in non-core subsidiaries 49.00%          
Minimum debt service coverage ratio 1.5          
As of the end of each fiscal quarter ending September 30, 2016 and thereafter            
Line of Credit Facility [Line Items]            
Covenant leverage ratio (not to exceed) 2.75          
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Additional borrowing capacity           $ 25,000,000
Current borrowing capacity           75,000,000
Capacity available in Canadian Dollars, Euros, and Pounds Sterling (up to)           20,000,000
Amount outstanding $ 27,880,000     $ 15,033,000    
Commitment fee | Rate 0.375%          
Interest rate at period end 4.75%          
Revolving Credit Facility | Federal Funds Rate            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 0.50%          
Revolving Credit Facility | LIBOR            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 1.50%          
Revolving Credit Facility | Maximum | Adjusted Base Rate Applicable Margin Rate            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 0.50%          
Revolving Credit Facility | Maximum | LIBOR            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 2.00%          
Revolving Credit Facility | Minimum | Adjusted Base Rate Applicable Margin Rate            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 0.25%          
Revolving Credit Facility | Minimum | 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         $ 20,000,000  
Current borrowing capacity   $ 75,000,000 $ 60,000,000   $ 30,000,000 $ 30,000,000
Amount outstanding $ 24,000,000     $ 28,500,000    
Weighted average interest rate 3.32%          
Principal payments due in quarterly installments $ 1,500,000