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Capital Stock - Schedule of Common Stock Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 211,806 |
Ending balance | $ 223,412 |  | 223,412 |
Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance | 218,801 | $ 204,171 | 211,806 | $ 194,953
Stock compensation expense | 4,044 | 1,904 | 10,130 | 9,595
Stock consideration in acquisition |  |  | 921 | 0
Ending balance | 223,412 | 207,315 | 223,412 | 207,315
Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance | 303,744 | 296,870 | 296,390 | 296,081
Stock compensation expense | 0 | 0 | 0 | 0
Stock consideration in acquisition |  |  | 0 | 0
Ending balance | 303,500 | 296,713 | 303,500 | 296,713
Restricted and performance stock awards | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted and performance stock awards | 70 | 93 | 2,713 | 1,594
Restricted and performance stock awards | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted and performance stock awards | 70 | 93 | 2,713 | 1,594
Stock options exercised | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | 637 | 1,333 | 2,967 | 4,124
Stock options exercised | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock compensation expense | 292 | 528 | 1,194 | 2,030
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 | (118) | (464) | (7,713) | (4,299)
Employee stock purchase program | Common Stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Employee stock purchase program | 0 | 0 | 301 | 237
Employee stock purchase program | Treasury Cost |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Employee stock purchase program | $ 0 | $ 0 | 43 | 43
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 |  |  | $ (3,347) | $ 0

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