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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Common stock, par value (in usd per share) | $ 0.001 |  | $ 0.001 |
Treasury stock (in shares) | 24,672,932 |  | 24,721,372 |
Common stock |  |  |  |
Common stock, par value (in usd per share) |  |  | $ 0.001 | $ 0.001
Options exercised (in shares) | 107,148 | 127,774 |  |
Conversion of common stock units (in shares) | 30,368 | 15,981 |  |
Conversion of restricted stock units (in shares) | 163,835 | 280,341 |  |
Retained earnings |  |  |  |
Cash dividends (in usd per share) | $ 0.57 | $ 0.55 |  |
Treasury stock, at cost |  |  |  |
Treasury stock (in shares) | 24,723,533 | 24,672,932 | 24,721,372 | 24,672,932
Treasury stock, acquisitions (in shares) | 2,161 | 0 |  |

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