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Shareholders' Equity Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Cross Currency Swap interest portion recognized in income | $ 800 |  |
Common Stock, Shares Authorized | 125,000,000 | 125,000,000 |
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |
Common Stock, Voting Rights | one |  |
Common Stock Reserved for Issuance to the Stock Option Plans | 3,252,712 |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |
Preferred Stock, Shares Authorized | 10,000,000 | 10,000,000 |
Preferred Stock, Par Value | $ 0.01 | $ 0.01 |
Share Repurchase Program and Treasury Stock [Abstract] |  |  |
Treasury Stock Acquired, Repurchase Authorization | 2.0 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 2,100,000 |  |
Shares Repurchased Under Share Repurchase Program | 27,500,000 |  |
Share Repurchase Program, Total Cost Program to Date | $ 4,400,000 |  |
Repurchases of Common Stock, Value | $ (474,999) | $ (399,997) | $ (499,992)
Repurchases of Common Stock, Shares | (802,809) | (749,254) |
Treasury Stock Acquired, Average Cost Per Share | $ 591.65 | $ 533.84 |
Exercise of stock options and restricted stock units, shares | 183,379 | 270,413 |
Cross Currency Swap Revaluation Portion Recognized in Earnings | $ 3,000 |  |

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