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Stockholders' Equity - Additional Information (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 19, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2014 | Apr. 30, 2014
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 90,000,000 | 90,000,000 |  |  |
Common stock, par value (usd per share) |  | $ 1 | $ 1 |  |  |
Common stock, shares issued |  | 66,100,000 | 65,400,000 |  |  |
Common stock, shares outstanding |  | 60,000,000 | 59,600,000 |  |  |
Preference stock, shares authorized |  | 800,000 |  |  |  |
Preference stock, par value (usd per share) |  | $ 1 |  |  |  |
Cash dividends declared per common share (usd per share) |  | $ 0.28 | $ 0.28 | $ 0.25 |  |
Share repurchase program, authorized amount |  |  |  |  |  | $ 15,000,000
Shares acquired |  |  |  | 724,792 |  |
Stock repurchase program, amount acquired |  |  | $ 37,800,000 | $ 10,600,000 |  |
Cash dividends paid to stockholders |  | $ 16,800,000 | $ 16,900,000 | $ 15,600,000 |  |
Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends declared per common share (usd per share) | $ 0.07 |  |  |  |  |
November 2014 Repurchase Program [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  | $ 75,000,000 |
Shares acquired |  | 0 | 2,961,007 |  |  |
Stock repurchase program, amount acquired |  |  | $ 37,800,000 |  |  |

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