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Line of Credit (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 01, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]            
Amount outstanding under line of credit $ 95,000,000   $ 95,000,000     $ 101,500,000
Interest expense on borrowings $ 1,200,000 $ 1,400,000 $ 2,500,000 $ 2,500,000    
Line of Credit | US Bank            
Line of Credit Facility [Line Items]            
Effective interest rate 4.16%   4.16%      
Line of Credit | US Bank | LIBOR | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate     1.25%      
Line of Credit | US Bank | LIBOR | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate     1.75%      
Line of Credit | US Bank | Base Rate | Minimum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate     0.00%      
Line of Credit | US Bank | Base Rate | Maximum            
Line of Credit Facility [Line Items]            
Basis spread on variable rate     0.50%      
Line of Credit | US Bank | Enson            
Line of Credit Facility [Line Items]            
Ownership interest used to secure obligations 65.00%   65.00%      
Line of Credit | Second Amended Credit Agreement            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 130,000,000   $ 130,000,000      
Commitment fees     0      
Line of Credit | Second Amended Credit Agreement | Forecast            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity         $ 125,000,000  
Letter of Credit            
Line of Credit Facility [Line Items]            
Letter of credit outstanding amount $ 2,700,000   $ 2,700,000