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Shareholders' Equity | 6 Months Ended
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Jun. 30, 2018
Stockholders' Equity Note [Abstract] |
Shareholders' Equity | Shareholders' Equity During each quarter of 2017 and the first and second quarters of 2018, our Board of Directors declared a cash dividend of $0.15 per share of common stock. The Company expects to continue to pay regular quarterly cash dividends, though each subsequent quarterly dividend is subject to review and approval by the Board of Directors. On July 21, 2016, our Board of Directors approved a stock repurchase authorization for up to three million shares of the Company’s common stock. The following table summarizes our share repurchases for the three and six months ended June 30, 2018 and 2017.
| Three months ended |  | Six months ended
| June 30, 2018 |  |  | June 30, 2017 |  |  | June 30, 2018 |  |  | June 30, 2017 |
Shares repurchased | 132,880 |  |  | 42,055 |  |  | 497,166 |  |  | 246,864 |
Cost of shares repurchased | $ | 8,172 |  |  | $ | 1,999 |  |  | $ | 28,165 |  |  | $ | 11,995 |
Average cost per share | $ | 61.50 |  |  | $ | 47.54 |  |  | $ | 56.65 |  |  | $ | 48.59 |
As of June 30, 2018, 1,321,499 shares were available to be purchased under the 2016 Plan.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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