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Shareholders' Equity-Common Stock Rollforward (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 01, 2016
Preferred Stock, Shares Authorized | 2,000,000 |  |  |
Stock Repurchase Program, Authorized Amount | $ 600,000 |  |  | $ 400,000
Stock Repurchase Program, Dollar Value of Shares Repurchased | 0 |  |  | 271,388
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 600,000 |  |  | $ 128,612
Common Stock Issued [Member] |  |  |  |
Common stock outstanding, Beginning balance | 125,424 | 125,424 | 125,424 |
Shares issued for stock-based compensation awards | 0 | 0 | 0 |
Repurchases of common stock | 0 | 0 | 0 |
Common stock outstanding, Ending balance | 125,424 | 125,424 | 125,424 |
Treasury Stock |  |  |  |
Common stock outstanding, Beginning balance | 37,733 | 36,511 | 34,501 |
Shares issued for stock-based compensation awards | (709) | (1,097) | (1,372) |
Repurchases of common stock | 3,209 | 2,319 | 3,382 |
Common stock outstanding, Ending balance | 40,233 | 37,733 | 36,511 |
Common Stock at Par Value |  |  |  |
Common stock outstanding, Beginning balance | 87,691 | 88,913 | 90,923 |
Shares issued for stock-based compensation awards | 709 | 1,097 | 1,372 |
Repurchases of common stock | (3,209) | (2,319) | (3,382) |
Common stock outstanding, Ending balance | 85,191 | 87,691 | 88,913 |

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