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Capital Stock and Share Based Compensation Plans - Schedule of stock compensation costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based compensation, net of tax | $ 9,907 | $ 8,100 | $ 7,717
Discontinued Operations |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total share-based compensation | 0 | 227 | 465
Continuing Operations |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total share-based compensation | 13,308 | 10,781 | 12,495
Restricted Stock Units (RSUs) |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total share-based compensation | $ 13,308 | $ 11,008 | $ 12,960

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