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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Activity Relating to Common Shares | The following table summarizes the activity relating to shares of the Company’s common stock during the nine months ended September 30, 2018 (in thousands):
| Issued |  |  | Treasury |  |  | Outstanding |
| Shares |  |  | Shares |  |  | Shares |
Balance, as of December 31, 2017 |  | 45,778 |  |  |  | (11,043 | ) |  |  | 34,735 |
Shares repurchased |  | — |  |  |  | (342 | ) |  |  | (342 | )
Vesting of performance share units |  | 127 |  |  |  | — |  |  |  | 127 |
Stock option exercises |  | 1,325 |  |  |  | — |  |  |  | 1,325 |
Restricted stock grants |  | 50 |  |  |  | — |  |  |  | 50 |
Shares acquired through cashless exercise (1) |  | — |  |  |  | (962 | ) |  |  | (962 | )
Shares cancelled |  | (962 | ) |  |  | 962 |  |  |  | — |
Balance, as of September 30, 2018 |  | 46,318 |  |  |  | (11,385 | ) |  |  | 34,933 |
(1) | All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or performance share units vested. These shares have been cancelled by the Company.
Summary of Dividends Declared and Paid | The following table summarizes the dividends declared and paid by the Company:
|  | Dividend |  | Shareholders |  | Dividend |  | Cash Dividend |
2018 |  | Declared Date |  | Record Date |  | Payable Date |  | Per Share Amount |
First Quarter |  | January 22, 2018 |  | February 28, 2018 |  | March 12, 2018 |  | $ | 0.14 |
Second Quarter |  | April 12, 2018 |  | April 27, 2018 |  | May 4, 2018 |  | $ | 0.14 |
Third Quarter |  | May 29, 2018 |  | July 2, 2018 |  | July 16, 2018 |  | $ | 0.16 |

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