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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Common Stock Activity [Roll Forward] |  |
Beginning balance | $ 242,693 |
Ending balance | 245,887 |
Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Beginning balance | 242,693 | $ 229,127
Stock compensation expense | (3,293) | (3,522)
Ending balance | 245,887 | 232,167
Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Beginning balance | 326,156 | 303,566
Stock compensation expense | 0 | 0
Ending balance | 329,615 | 328,081
Restricted and performance stock awards | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Restricted and performance stock awards | 1,333 | 2,239
Restricted and performance stock awards | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Restricted and performance stock awards | 1,333 | 2,239
Stock options exercised | Common Stock |  |
Common Stock Activity [Roll Forward] |  |
Stock compensation expense | (1,234) | (1,757)
Stock options exercised | Treasury Cost |  |
Common Stock Activity [Roll Forward] |  |
Stock compensation expense | (556) | (976)
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 | (5,348) | (7,617)
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 | $ 0 | $ (20,113)

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