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Stockholders' Equity and Earnings Per Share (Earnings Per Share Calculation) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 17, 2014
Jan. 16, 2014
Basic:            
Net income $ 159,537 $ 171,416 $ 403,713 $ 485,820    
Basic weighted-average number of shares outstanding (in shares) 141,498,000 145,559,000 142,595,000 145,455,000    
Basic EPS (in dollars per share) $ 1.13 $ 1.18 $ 2.83 $ 3.34    
Diluted:            
Net income $ 159,537 $ 171,416 $ 403,713 $ 485,820    
Basic weighted-average number of shares outstanding (in shares) 141,498,000 145,559,000 142,595,000 145,455,000    
Diluted potential common shares (in shares) 545,000 561,000 487,000 633,000    
Diluted weighted-average number of shares outstanding (in shares) 142,043,000 146,120,000 143,082,000 146,088,000    
Diluted EPS (in dollars per share) $ 1.12 $ 1.17 $ 2.82 $ 3.33    
Common Stock            
Diluted:            
Shares of common stock into which the warrant may be converted (in shares)         230,282  
MetroCorp | MetroCorp            
Diluted:            
Shares of common stock into which the warrant may be converted (in shares)           771,429