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Changes in Stockholders' Equity (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Purchases and retirement of common stock | $ 7,100,000
Stock repurchase program, outstanding balance authorized to be repurchased | 324,300,000
Stock repurchase program, value of remaining number of shares authorized to be repurchased | $ 31,400,000
Open Market Transaction [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Repurchased and Retired During Period, Shares | shares | 110,132
Purchases and retirement of common stock | $ 7,100,000
Stock Repurchased and Retired During Period, Average Cost Per Share | $ / shares | $ 64.35
December 2016 ASR Program [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock repurchase program, authorized amount | $ 292,900,000.0

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