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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jul. 23, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 2,600,000 |  |  |  | $ 2,600,000 |
Acquisition of treasury stock (value) | 58,512 | $ 62,854 | $ 28,675 | $ 72,025 |  |
Value of common shares remaining to be repurchased | $ 46,589 |  |  |  | $ 46,589 |
Repurchases in Accordance with Stock Award Agreements [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Acquisition of treasury stock (shares) |  |  |  |  | 17 |
Acquisition of treasury stock (value) |  |  |  |  | $ 10,398 |
Subsequent Event [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 100,000

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