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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2016
Equity [Abstract] |
Activity Relating to Common Shares | The following table summarizes the activity relating to shares of the Company’s common stock during the six months ended June 30, 2016 (in thousands):
| Issued |  |  | Treasury |  |  | Outstanding |
| Shares |  |  | Shares |  |  | Shares |
Balance, as of December 31, 2015 |  | 45,525 |  |  |  | (10,415 | ) |  |  | 35,110 |
Shares repurchased |  | — |  |  |  | (367 | ) |  |  | (367 | )
Shares reissued |  | — |  |  |  | 584 |  |  |  | 584 |
Shares acquired through cashless exercise (1) |  | — |  |  |  | (263 | ) |  |  | (263 | )
Shares cancelled |  | (263 | ) |  |  | 263 |  |  |  | — |
Balance, as of June 30, 2016 |  | 45,262 |  |  |  | (10,198 | ) |  |  | 35,064 |
(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 restricted stock 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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