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Debt Senior Unsecured Notes (Details Textual) (Details) - USD ($)
12 Months Ended
Oct. 04, 2018
Aug. 21, 2018
Dec. 09, 2016
Apr. 14, 2015
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]              
Senior unsecured notes payable         $ 1,040,998,000 $ 1,039,416,000  
Proceeds from issuance of debt     $ 181,500,000        
Loss on extinguishment of debt   $ (31,200,000)     0 0 $ 31,226,000
Borrowings under Credit Agreement         440,000,000.0 $ 255,000,000  
Unsecured Debt | Senior Notes [Member]              
Debt Instrument [Line Items]              
Long-term debt         $ 1,050,000,000.00    
Unsecured Debt | Senior Notes Due 2023              
Debt Instrument [Line Items]              
Senior unsecured notes payable     $ 175,000,000.0 $ 400,000,000.0      
Stated interest rate       6.875%      
Effective interest rate         5.50%    
Proceeds from issuance of debt       $ 391,000,000.0      
Repayments of debt   $ 30,400,000          
Unsecured Debt | Senior Notes Due 2023 | Debt Instrument, Redemption, Period One              
Debt Instrument [Line Items]              
Percentage of principal amount redeemed   105.156% 105.50%        
Unsecured Debt | 2026 Notes Offering              
Debt Instrument [Line Items]              
Senior unsecured notes payable   $ 750,000,000.0          
Stated interest rate   5.875%          
Proceeds from issuance of unsecured debt   $ 740,000,000.0          
Unsecured Debt | Additional 2026 Notes              
Debt Instrument [Line Items]              
Senior unsecured notes payable $ 300,000,000.0            
Stated interest rate 5.875%            
Percentage of principal amount redeemed 100.50%            
Proceeds from issuance of unsecured debt $ 297,300,000            
Unsecured Debt | Additional 2026 Notes | Debt Instrument, Redemption, Period One              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.50%            
Threshold percentage of principle 25.00%            
Default period 30 days            
Period after notice to comply 180 days            
Period after notice to comply with other agreements 60 days            
Maximum aggregate payment defaults and accelerations $ 50,000,000.0            
Maximum outstanding judgments $ 50,000,000.0            
Maximum outstanding judgements, payment period 60 days            
Unsecured Debt | Senior Notes Due 2026 | Debt Instrument, Redemption, Period One              
Debt Instrument [Line Items]              
Percentage of principal amount redeemed 35.00%            
Debt redemption price, percentage 105.875%            
Threshold percentage of outstanding principal remaining 65.00%            
Unsecured Debt | Senior Notes Due 2026 | Debt Instrument, Redemption, Period Two              
Debt Instrument [Line Items]              
Debt redemption price, percentage 104.406%            
Redemption period 180 days