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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Beginning of year at Dec. 31, 2012   $ 79,380 $ 0 $ 1,763,117
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options   1,884 (438)  
Share-based compensation expense   125 849  
Tax benefit on sales of incentive stock options $ 202 202    
Net income 112,143     112,143
Dividends paid to shareholders       (134,776)
End of year at Dec. 31, 2013 1,822,486 81,591 411 1,740,484
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options   6,824 (577)  
Share-based compensation expense   142 3,970  
Tax benefit on sales of incentive stock options 148 148    
Net income 177,949     177,949
Dividends paid to shareholders       (135,496)
End of year at Dec. 31, 2014 1,875,446 88,705 3,804 1,782,937
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Exercise of stock options   2,111 0  
Share-based compensation expense   142 5,066  
Tax benefit on sales of incentive stock options 27 27    
Net income 74,479     74,479
Dividends paid to shareholders       (136,386)
End of year at Dec. 31, 2015 $ 1,820,885 $ 90,985 $ 8,870 $ 1,721,030