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Debt - Unsecured Senior Notes - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2017
Apr. 30, 2015
Dec. 31, 2018
Oct. 30, 2019
May 31, 2019
Apr. 19, 2018
Dec. 31, 2017
Apr. 01, 2016
Debt Instrument [Line Items]                
Debt financing costs     $ 1,000,000       $ 900,000  
Revolving Credit Facility and Senior Notes | Subsequent Event                
Debt Instrument [Line Items]                
Debt instrument, interest rate         7.50%      
Unsecured Senior Notes                
Debt Instrument [Line Items]                
Debt instrument, interest rate               6.50%
Legal fees $ 100,000              
Consent fee $ 200,000   $ 300,000     $ 300,000 200,000  
Unsecured Senior Notes | Subsequent Event                
Debt Instrument [Line Items]                
Consent fee       $ 300,000        
Unsecured Senior Notes | 5.50% Senior Notes                
Debt Instrument [Line Items]                
Debt instrument, face amount   $ 55,000,000            
Debt instrument, interest rate   5.50% 8.50%          
Proceeds from issuance of long-term debt   $ 53,500,000            
Debt financing costs   $ 1,500,000            
Accrued unpaid interest     $ 800,000       $ 600,000  
Unsecured Senior Notes | 5.50% Senior Notes | Before May 1, 2016                
Debt Instrument [Line Items]                
Redemption price, percentage     101.00%