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Debt Obligations - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Feb. 28, 2019
Dec. 31, 2018
Long Term Debt              
Loss on debt extinguishment $ 0   $ 0 $ 220,000 $ 0    
Gross amount of debt 1,279,216,000     1,279,216,000     $ 1,358,430,000
Revolving credit facility              
Long Term Debt              
Debt issuance costs, line of credit   $ 2,800,000          
Loss on debt extinguishment   200,000          
Note payable              
Long Term Debt              
Gross amount of debt 7,565,000     7,565,000   $ 8,100,000 0
Note payable at fixed interest rates ranging from 2.60% to 2.97%, maturing in July 2024, secured by an aircraft              
Long Term Debt              
Gross amount of debt $ 9,587,000     $ 9,587,000     $ 10,937,000
Fixed rate (as a percent) 3.18%     3.18%      
LIBOR | Minimum | Note payable              
Long Term Debt              
Variable rate spread       1.85%      
LIBOR | Maximum | Note payable              
Long Term Debt              
Variable rate spread       2.50%      
Revolving Credit Facility              
Long Term Debt              
Line of credit facility, maximum borrowing capacity $ 1,000,000,000.0 $ 890,000,000.0   $ 1,000,000,000.0      
Line of credit facility, maximum borrowing capacity under accordion feature $ 1,300,000,000     $ 1,300,000,000