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Stock and Stockholders' Equity (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 24, 2020
USD ($)
dividendPeriod
day
director
$ / shares
Rate
shares
Feb. 28, 2021
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Feb. 28, 2017
USD ($)
Class of Stock [Line Items]              
Shares sold in offering (in shares) | shares 41,071,429            
Offering proceeds $ 275,000,000            
Accrued preferred stock dividends [1]       $ 7,659,000      
Dividends paid on preferred stock       $ 5,850,000 $ 0 $ 0  
Common stock cash dividend paid (in dollars per share) | $ / shares       $ 0.14 $ 0.14 $ 0.14  
Cash dividends paid to common stockholders       $ 38,544,000 $ 153,508,000 $ 154,080,000  
Authorized to repurchase             $ 500,000,000
Number of shares repurchased (in shares) | shares       0 3,673,768 1,075,255  
Value of shares repurchased         $ 77,636,000 $ 26,281,000  
Remaining authorized amount     $ 287,000,000 $ 287,000,000      
Series A Mandatory Convertible Preferred Stock              
Class of Stock [Line Items]              
Shares sold in offering (in shares) | shares 3,340,000            
Annual percentage rate 6.50%     6.50%      
Offering proceeds $ 323,000,000            
Liquidation preference (in dollars per share) | $ / shares $ 100            
Annual liquidation preference (in dollars per share) | $ / shares $ 6.50            
Accrued preferred stock dividends     $ 7,659,000 $ 8,000,000      
Number of consecutive trading days | day 20            
Number of dividend periods with no stock declared or paid | dividendPeriod 6            
Number of new directors to elect | director 2            
Series A Mandatory Convertible Preferred Stock | Subsequent Event              
Class of Stock [Line Items]              
Preferred dividend declared (in dollars per share) | $ / shares   $ 1.625          
Series A Mandatory Convertible Preferred Stock | Minimum              
Class of Stock [Line Items]              
Conversion rate | Rate 1190.48%            
Shares issued at conversion (in shares) | shares 40,000,000            
Series A Mandatory Convertible Preferred Stock | Maximum              
Class of Stock [Line Items]              
Conversion rate | Rate 1428.57%            
Shares issued at conversion (in shares) | shares 48,000,000            
[1] Our mandatory convertible preferred stock accumulates cumulative dividends at an annual rate of 6.50%.