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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Cumulative Convertible Preferred Stock | The following table provides certain information for the convertible Series A preferred stock as of the dates presented (in thousands, except conversion factor):
|  | As of December 31,
|  | 2018 |  | 2017
Shares issued and outstanding |  | 10 |  |  | 10 |
Conversion factor |  | 2.50 |  |  | 2.50 |
Common shares resulting if converted |  | 25 |  |  | 25 |
Activity Relating to Common Shares | The following table summarizes the activity relating to shares of the Company’s Common Stock during the periods presented (in thousands):
|  | Issued Shares |  | Treasury Shares |  | Outstanding Shares
Balance, as of December 31, 2015 |  | 45,525 |  |  | (10,415 | ) |  | 35,110 |
Shares repurchased |  | — |  |  | (441 | ) |  | (441 | )
Shares reissued |  | — |  |  | 584 |  |  | 584 |
Options exercised |  | 124 |  |  | — |  |  | 124 |
Shares acquired through cashless exercise (1) |  | — |  |  | (325 | ) |  | (325 | )
Shares cancelled |  | (325 | ) |  | 325 |  |  | — |
Balance, as of December 31, 2016 |  | 45,324 |  |  | (10,272 | ) |  | 35,052 |
Shares repurchased |  | — |  |  | (771 | ) |  | (771 | )
Vesting of performance share units |  | 115 |  |  | — |  |  | 115 |
Options exercised |  | 804 |  |  | — |  |  | 804 |
Common stock issued |  | 26 |  |  | — |  |  | 26 |
Shares acquired through cashless exercise (1) |  | — |  |  | (491 | ) |  | (491 | )
Shares cancelled |  | (491 | ) |  | 491 |  |  | — |
Balance, as of December 31, 2017 |  | 45,778 |  |  | (11,043 | ) |  | 34,735 |
Shares repurchased |  | — |  |  | (688 | ) |  | (688 | )
Vesting of performance share units |  | 127 |  |  | — |  |  | 127 |
Options exercised |  | 1,890 |  |  | — |  |  | 1,890 |
Restricted stock grant |  | 80 |  |  | — |  |  | 80 |
Shares acquired through cashless exercise (1) |  | — |  |  | (1,361 | ) |  | (1,361 | )
Shares cancelled |  | (1,361 | ) |  | 1,361 |  |  | — |
Balance, as of December 31, 2018 |  | 46,514 |  |  | (11,731 | ) |  | 34,783 |
(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 or restricted stock (as defined in “—Note 9 (Share-Based Compensation)”) vested. These shares have been canceled by the Company.
Summary of Dividends Declared on its Outstanding Shares of Common Stock to its Shareholders | The Company declared dividends on its outstanding shares of common stock to its shareholders of record as follows for the periods presented (in thousands, except per share amounts):
|  | For the Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
|  | Per Share Amount |  | Aggregate Amount (1) |  | Per Share Amount |  | Aggregate Amount (1) |  | Per Share Amount |  | Aggregate Amount
First Quarter |  | $ | 0.14 |  |  | $ | 4,904 |  |  | $ | 0.14 |  |  | $ | 4,932 |  |  | $ | 0.14 |  |  | $ | 4,915 |
Second Quarter |  | $ | 0.14 |  |  | $ | 4,920 |  |  | $ | 0.14 |  |  | $ | 4,887 |  |  | $ | 0.14 |  |  | $ | 4,913 |
Third Quarter |  | $ | 0.16 |  |  | $ | 5,592 |  |  | $ | 0.14 |  |  | $ | 4,830 |  |  | $ | 0.14 |  |  | $ | 4,903 |
Fourth Quarter |  | $ | 0.29 |  |  | $ | 10,130 |  |  | $ | 0.27 |  |  | $ | 9,392 |  |  | $ | 0.27 |  |  | $ | 9,461 |
(1) Includes dividend equivalents due to certain employees who hold Performance Share Units which are subject to time-vesting conditions.

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