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Debt and Credit Facility - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 18, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
May 01, 2020
Apr. 28, 2020
Dec. 31, 2019
Nov. 26, 2019
May 15, 2016
Debt Instrument                    
Interest expense capitalized   $ 200,000 $ 400,000 $ 500,000 $ 900,000          
Revolving Credit Facility                    
Debt Instrument                    
Line of credit facility, maximum borrowing capacity   375,000,000.0   375,000,000.0            
Senior Notes Due 2025 | Senior Notes                    
Debt Instrument                    
Debt instrument contractual rate (percent)           6.50% 6.50%      
Debt issuance, percentage of principal amount           101.00% 100.00%      
Debt principal amount   350,000,000.0   350,000,000.0   $ 50,000,000.0 $ 300,000,000.0      
Unamortized debt issuance costs   5,900,000   5,900,000            
Interest expense   $ 4,200,000   $ 4,200,000            
Effective interest rate (percent)   6.80%   6.80%            
Debt instrument, payment terms       Interest accrues on the 6.50% Senior Notes beginning April 28, 2020 at a rate of 6.50% per annum and is payable semiannually on May 1 and November 1 of each year. The first interest payment date is November 1, 2020            
Debt instrument, frequency of interest payment       semiannually            
Debt Instrument, first interest payment date       Nov. 01, 2020            
Fair value of outstanding debt   $ 365,500,000   $ 365,500,000            
Senior Notes Due 2025 | Senior Notes | On or After May 1, 2022                    
Debt Instrument                    
Redemption price as percentage of principal (percent)       103.25%            
Senior Notes Due 2025 | Senior Notes | On or After May 1, 2023                    
Debt Instrument                    
Redemption price as percentage of principal (percent)       101.625%            
Senior Notes Due 2025 | Senior Notes | On or After May 1, 2024                    
Debt Instrument                    
Redemption price as percentage of principal (percent)       100.00%            
Senior Notes Due 2025 | Senior Notes | Prior to May 1, 2022                    
Debt Instrument                    
Redemption price as percentage of principal (percent)       106.50%            
Percentage of principal that can be redeemed (percent)       40.00%            
Senior Notes Due 2028 | Senior Notes                    
Debt Instrument                    
Debt instrument contractual rate (percent)                 4.625%  
Debt issuance, percentage of principal amount                 100.00%  
Debt principal amount                 $ 500,000,000.0  
Unamortized debt issuance costs   7,000,000.0   $ 7,000,000.0            
Interest expense   $ 6,000,000.0   $ 12,000,000.0            
Effective interest rate (percent)   4.80%   4.80%            
Fair value of outstanding debt   $ 482,200,000   $ 482,200,000       $ 513,500,000    
Senior Notes Due 2024 | Senior Notes                    
Debt Instrument                    
Debt instrument contractual rate (percent)                   5.875%
Debt issuance, percentage of principal amount                   100.00%
Debt principal amount                   $ 375,000,000.0
Interest expense     $ 5,700,000   $ 11,400,000          
Effective interest rate (percent)     6.10%   6.10%          
Senior Notes Due 2024 | Senior Notes | On or After May 15, 2019                    
Debt Instrument                    
Redemption price as percentage of principal (percent) 104.406%