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Statements Of Changes In Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Capital In Excess Of Par Value [Member]
--- | --- | --- | --- | ---
Balance, in shares at Dec. 31, 2014 |  | 86,094 |  |
Balance at Dec. 31, 2014 | $ 1,494,064 | $ 8,609 | $ 1,351,054 | $ 134,401
Net income | 304,690 |  | 304,690 |
Stock Repurchased During Period, Shares |  | (1,682) |  |
Stock Repurchased and Retired During Period, Value | (114,117) | $ (168) | (113,949) |
Balance, in shares at Dec. 31, 2015 |  | 84,412 |  |
Balance at Dec. 31, 2015 | 1,684,637 | $ 8,441 | 1,541,795 | 134,401
Net income | 295,765 |  | 295,765 |
Stock Repurchased During Period, Shares |  | (2,063) |  |
Stock Repurchased and Retired During Period, Value | (130,316) | $ (206) | (130,110) |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 68 |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures |  | $ 7 |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition |  |  |  | 1,065
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 1,072 |  |  |
Balance, in shares at Dec. 31, 2016 |  | 82,417 |  |
Balance at Dec. 31, 2016 | 1,851,158 | $ 8,242 | 1,707,450 | 135,466
Net income | 463,774 |  | 463,774 |
Stock Repurchased During Period, Shares |  | (92) |  |
Stock Repurchased and Retired During Period, Value | (8,013) | $ (9) | (8,004) |
Payments of Ordinary Dividends, Common Stock | (32,963) |  | (32,963) |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 51 |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures |  | $ 5 |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition |  |  |  | 2,893
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 2,898 |  |  |
Balance, in shares at Dec. 31, 2017 |  | 82,376 |  |
Balance at Dec. 31, 2017 | $ 2,276,854 | $ 8,238 | $ 2,130,257 | $ 138,359

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