Annual report pursuant to Section 13 and 15(d)

Changes In Capitalization (Details)

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Changes In Capitalization (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 31, 2018
Jan. 31, 2018
Class of Stock [Line Items]              
Stock repurchase program, authorized amount           $ 200,000,000 $ 100,000,000
Stock repurchase program, additional authorized amount           $ 100,000,000  
Stock repurchased and retired during period (in shares)         20,700,000    
Stock repurchased and retired during period, net of tax         $ 200,000,000.0    
Stock repurchase program, period in force 24 months            
Value of shares repurchased     $ 236,000 $ 30,688,000 $ 200,251,000    
Share purchased to satisfy tax withholding requirements (in shares)     200,000 100,000      
Tax withholding requirement     $ 200,000 $ 700,000      
Common Stock              
Class of Stock [Line Items]              
Stock repurchased and retired during period (in shares)     243,054 3,951,198 20,746,536    
Value of shares repurchased     $ 3,000 $ 40,000 $ 207,000    
Share Repurchase Program | Common Stock              
Class of Stock [Line Items]              
Stock repurchased and retired during period (in shares)   0   3,800,000      
Value of shares repurchased       $ 30,000,000