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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 03, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 02, 2016 | Jan. 06, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  | $ 1,300,000 |  |  |  |
Acquisition of treasury stock (value), total |  | 485,853 | $ 88,338 | $ 138,903 |  |
Value of common shares remaining to be repurchased |  | $ 116,394 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, additional authorized amount |  |  |  |  | $ 300,000 | $ 300,000
Acquisition of treasury stock (shares) | 609 |  |  |  |  |
Acquisition of treasury stock (value), total | $ 270,013 |  |  |  |  |
Repurchases in Accordance with Stock Award Agreements [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Acquisition of treasury stock (shares) |  | 1 | 1 | 57 |  |
Acquisition of treasury stock (value), total |  | $ 12 | $ 342 | $ 28,916 |  |
Share Repurchase Plans [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Acquisition of treasury stock (shares) |  | 839 | 154 | 336 |  |
Acquisition of treasury stock (value), total |  | $ 485,841 | $ 87,996 | $ 109,987 |  |

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