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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Common stock, par value (in usd per share) | $ 0.001 |  | $ 0.001 |
Treasury stock (in shares) | 24,721,372 |  | 24,672,932 |
Common stock |  |  |  |
Common stock, par value (in usd per share) |  |  | $ 0.001 | $ 0.001
Options exercised (in shares) | 156,211 | 114,507 |  |
Conversion of common stock units (in shares) | 15,981 | 15,629 |  |
Conversion of restricted stock units (in shares) | 293,002 | 188,207 |  |
Retained earnings |  |  |  |
Cash dividends (in usd per share) | $ 0.825 | $ 0.795 |  |
Treasury stock, at cost |  |  |  |
Treasury stock (in shares) | 24,721,372 | 24,672,932 | 24,672,932 | 23,971,522
Treasury stock, acquisitions (in shares) | 48,440 | 701,410 |  |

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