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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Common Shares in Treasury and Common Shares Outstanding |
| Shares in Treasury |  | Shares Outstanding
Balance at January 1, 2017 | 23,577,411 |  |  | 93,013,031 |
Shares tendered as payment for option rights exercised | 16,545 |  |  | (16,545 | )
Shares issued for exercise of option rights |  |  | 969,936 |
Shares tendered in connection with vesting of restricted stock units | 82,777 |  |  | (82,777 | )
Balance at December 31, 2017 | 23,676,733 |  |  | 93,883,645 |
Shares tendered as payment for option rights exercised | 1,159 |  |  | (1,159 | )
Shares issued for exercise of option rights |  |  | 661,599 |
Shares tendered in connection with vesting of restricted stock units | 52,144 |  |  | (52,144 | )
Net shares issued for vesting of restricted stock units |  |  | 149,821 |
Treasury stock purchased | 1,525,000 |  |  | (1,525,000 | )
Balance at December 31, 2018 | 25,255,036 |  |  | 93,116,762 |
Shares tendered as payment for option rights exercised | 3,838 |  |  | (3,838 | )
Shares issued for exercise of option rights |  |  | 901,878 |
Shares tendered in connection with vesting of restricted stock units | 55,095 |  |  | (55,095 | )
Net shares issued for vesting of restricted stock units |  |  | 160,132 |
Treasury stock purchased | 1,675,000 |  |  | (1,675,000 | )
Shares transferred from defined benefit pension plan (1) | 300,000 |  |  | (300,000 | )
Balance at December 31, 2019 | 27,288,969 |  |  | 92,144,839 |
(1) Shares were transferred from the Company's terminated domestic defined benefit pension plan surplus assets in connection with the plan's termination. See Note 8. In accordance with ASC 715, the transferred shares are treated as treasury stock.

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