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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Shareholders' Equity, shares beginning of period (shares) at Dec. 31, 2016   319,090      
Shareholders' Equity beginning of period at Dec. 31, 2016 $ 4,659,363 $ 3,191 $ 3,116,490 $ (526) $ 1,540,208
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of accounting change (see Note 1) 18,237   (406)   18,643
Stock option exercises (shares)   961      
Stock option exercises 11,118 $ 10 11,108    
Stock issuances, net of cancellations (shares)   677      
Stock issuances, net of cancellations 3,566 $ 10 3,556    
Dividends declared (28,838)       (28,838)
Share repurchases (shares)   (4,696)      
Share repurchases (105,522) $ (50)     (105,472)
Share-based compensation 10,682   10,682    
Net income 91,518       91,518
Other comprehensive income 21     21  
Shareholders' Equity, shares end of period (shares) at Mar. 31, 2017   316,032      
Shareholders' Equity end of period at Mar. 31, 2017 4,660,145 $ 3,161 3,141,430 (505) 1,516,059
Shareholders' Equity, shares beginning of period (shares) at Dec. 31, 2017   286,752      
Shareholders' Equity beginning of period at Dec. 31, 2017 4,154,026 $ 2,868 3,171,542 (445) 980,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of accounting change (see Note 1) 22,411   0   22,411
Stock option exercises (shares)   284      
Stock option exercises 2,723 $ 3 2,720    
Stock issuances, net of cancellations (shares)   783      
Stock issuances, net of cancellations 3,485 $ 8 3,477    
Dividends declared (26,051)       (26,051)
Share repurchases (shares)   (1,941)      
Share repurchases (59,491) $ (20)     (59,471)
Share-based compensation 6,782   6,782    
Net income 170,751       170,751
Other comprehensive income 21     21  
Shareholders' Equity, shares end of period (shares) at Mar. 31, 2018   285,878      
Shareholders' Equity end of period at Mar. 31, 2018 $ 4,274,657 $ 2,859 $ 3,184,521 $ (424) $ 1,087,701