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Senior Notes (Details)
3 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
May 13, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Accumulated Amortization, Debt Premium             $ 221,000
Accumulated Amortization, Debt Issuance Costs   $ 1,242,000   $ 1,242,000     819,000
Credit Facility amortization of debt issuance costs       459,000 $ 592,000    
Gain (Loss) on Extinguishment of Debt   $ 0 $ (6,000) (23,807,000) (6,000)    
Debt Issuance Costs, Gross           $ 800,000  
Write-off Of Unamortized Debt Issuance Costs       1,800,000      
Write-off Of Unamortized Debt Premium       (1,400,000)      
Write off of Deferred Debt Issuance Cost       $ 3,400,000      
Redemption period       180 days      
Minimum [Member] | Ratio Actual [Member]              
Debt Instrument [Line Items]              
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)   0.25   0.25      
Senior Notes [Member]              
Debt Instrument [Line Items]              
Principal amount   $ 400,000,000   $ 400,000,000      
Accumulated amortization, debt discount   181,000   181,000     1,293,000
Accumulated Amortization, Debt Issuance Costs   51,000   51,000     496,000
Long-term Debt, Fair Value   403,200,000   403,200,000      
Acquisition debt imputed interest expense   4,250,000 6,625,000 17,517,000 19,875,000    
Credit Facility amortization of debt issuance costs   34,000 $ 72,000 $ 161,000 $ 208,000    
Senior Notes [Member] | Period One              
Debt Instrument [Line Items]              
Percentage of principal amount redeemed 40.00%            
Senior Notes [Member] | Period Two              
Debt Instrument [Line Items]              
Redemption price percentage 102.13%            
Percentage of principal amount redeemed 50.00%            
Senior Notes [Member] | Period Three              
Debt Instrument [Line Items]              
Redemption price percentage 101.06%            
Senior Notes [Member] | Period Four              
Debt Instrument [Line Items]              
Redemption price percentage 104.25%            
Senior Notes [Member] | Period Five              
Debt Instrument [Line Items]              
Redemption price percentage       101.00%      
Senior Notes [Member] | Period Six              
Debt Instrument [Line Items]              
Redemption price percentage       100.00%      
Senior Notes [Member] | Senior Note One [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate During Period         6.69%    
Debt Instrument, Discount Rate     6.87% 4.42%      
Accretion of debt discount, net of debt premium on senior notes   $ 118,000 $ 133,000 $ 384,000 $ 393,000    
Senior Notes [Member] | Senior Note Two [Member]              
Debt Instrument [Line Items]              
Stated interest rate percentage   6.625%   6.625%      
Debt Instrument, Interest Rate During Period       4.30% 6.90%    
Debt Instrument, Discount Rate     6.20%        
Accretion of debt discount, net of debt premium on senior notes   $ 0 $ 56,000 $ 85,000 $ 165,000    
Senior Notes [Member] | Senior Notes Due 2026              
Debt Instrument [Line Items]              
Principal amount             $ 400,000,000
Acquisition debt imputed interest expense       13,250,000      
Proceeds from Issuance of Senior Long-term Debt       395,500,000      
Debt Issuance Costs, Gross   1,300,000   1,300,000      
Debt Instrument, Unamortized Discount   $ 4,500,000   $ 4,500,000      
Debt Instrument, Unamortized Discount In Percent       1.125%      
Early Repayment of Senior Debt       $ 19,900,000      
Senior Notes [Member] | Senior Notes Due 2026 | Period One              
Debt Instrument [Line Items]              
Redemption price percentage 104.97%            
Senior Notes 4.25%              
Debt Instrument [Line Items]              
Debt Instrument, Term       92 months      
Gain (Loss) on Extinguishment of Debt       $ 23,700,000      
Senior Notes 4.25% | Senior Note Two [Member]              
Debt Instrument [Line Items]              
Stated interest rate percentage   4.25%   4.25%