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Debt - $350 Million 5% Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Loss on extinguishment of debt   $ 494,000 $ 494,000    
Unamortized deferred financing costs     2,833,000 $ 1,956,000  
Senior Notes [Member] | $350 Million 5% Senior Notes [Member]          
Debt Instrument [Line Items]          
Face amount $ 350,000,000 $ 350,000,000 $ 350,000,000   $ 350,000,000
Stated interest rate (as a percent) 5.00% 5.00% 5.00%    
Redemption price of per thousand $ 1,002.50        
Aggregate tendered amount $ 197,500,000 $ 197,500,000 $ 197,500,000    
Loss on extinguishment of debt   500,000 500,000    
Senior Notes [Member] | $350 Million 5% Senior Notes [Member] | Interest Expense [Member]          
Debt Instrument [Line Items]          
Unamortized deferred financing costs   $ 1,700,000 $ 1,700,000