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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 229,127 |
Ending balance | $ 233,786 |  | 233,786 |
Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance | 232,167 | $ 213,099 | 229,127 | $ 211,806
Stock compensation expense | (830) | (3,340) | (4,352) | (6,086)
Ending balance | 233,786 | 218,801 | 233,786 | 218,801
Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance | 328,081 | 300,919 | 303,566 | 296,390
Stock compensation expense | 0 | 0 | 0 | 0
Ending balance | 327,997 | 303,744 | 327,997 | 303,744
Restricted and performance stock awards | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted and performance stock awards | 226 | 232 | 2,464 | 2,643
Restricted and performance stock awards | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted and performance stock awards | 226 | 232 | 2,464 | 2,643
Stock options exercised | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | (677) | (1,372) | (2,433) | (2,330)
Stock options exercised | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | (330) | (395) | (1,307) | (902)
Treasury shares purchased | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Treasury shares purchased | 0 | 0 | 0 | 0
Treasury shares purchased | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Treasury shares purchased | (524) | (148) | (8,141) | (7,595)
Share repurchase program | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Treasury shares purchased | 0 | 0 | 0 | 0
Share repurchase program | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Treasury shares purchased | 0 | (3,347) | (20,113) | (3,347)
Stock consideration in acquisition | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | 0 | 921 | 0 | 921
Stock consideration in acquisition | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | 0 | 0 | 0 | 0
Employee stock purchase program | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | 338 | 301 | 338 | 301
Employee stock purchase program | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | $ 52 | $ 43 | $ 52 | $ 43

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