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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Common Stock Activity [Roll Forward] |  |
Beginning balance | $ 229,127 |
Ending balance | 232,167 |
Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Beginning balance | 229,127 | $ 211,806
Stock compensation expense | 3,522 | 2,745
Ending balance | 232,167 | 213,099
Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Beginning balance | 303,566 | 296,390
Stock compensation expense | 0 | 0
Ending balance | 328,081 | 300,919
Restricted and performance stock awards | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Restricted and performance stock awards | 2,239 | 2,411
Restricted and performance stock awards | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Restricted and performance stock awards | 2,239 | 2,411
Stock options exercised | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Stock compensation expense | 1,757 | 959
Stock options exercised | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Stock compensation expense | 976 | 506
Treasury shares purchased | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Treasury shares purchased | 0 | 0
Treasury shares purchased | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Treasury shares purchased | (7,617) | (7,446)
Share repurchase program | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Treasury shares purchased | 0 | 0
Share repurchase program | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Treasury shares purchased | $ (20,113) | $ 0

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