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Stockholders' Equity (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | May 24, 2018 | Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock shares | 1,100,000 |  | 1,200,000
Treasury stock, Cost basis | $ 23.8 |  | $ 25.5
Restricted Stock [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares nonvested | 1,500,000 |  | 1,500,000
2018 Stock Buyback Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares authorized for repurchase |  | 5.00% |
Number of shares authorized for repurchase |  | 4,300,000 |
Shares repurchased | 0 |  |

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