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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 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 three months ended March 31, 2018 (in thousands):
| Issued |  |  | Treasury |  |  | Outstanding |
| Shares |  |  | Shares |  |  | Shares |
Balance, as of December 31, 2017 |  | 45,778 |  |  |  | (11,043 | ) |  |  | 34,735 |
Shares repurchased |  | — |  |  |  | (93 | ) |  |  | (93 | )
Vesting of performance share units |  | 127 |  |  |  | — |  |  |  | 127 |
Stock option exercises |  | 804 |  |  |  | — |  |  |  | 804 |
Restricted stock grants |  | 50 |  |  |  | — |  |  |  | 50 |
Shares acquired through cashless exercise (1) |  | — |  |  |  | (611 | ) |  |  | (611 | )
Shares cancelled |  | (611 | ) |  |  | 611 |  |  |  | — |
Balance, as of March 31, 2018 |  | 46,148 |  |  |  | (11,136 | ) |  |  | 35,012 |
(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.

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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