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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | May 24, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock shares | 800,000 | 900,000 |
Treasury stock, Cost basis | $ 14.2 | $ 18.5 |
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 | 200,000 |  |
Shares purchased price per share | $ 41.30 |  |
Restricted Stock [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Number of shares nonvested | 1,300,000 | 1,300,000 |

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