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(Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 08, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock based compensation plans |  |  |  |
Share-based compensation expense |  | $ 8,963 | $ 9,030 | $ 5,641
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  | 1 year 9 months 18 days |  |
2016 Triton Plan [Member] |  |  |  |
Stock based compensation plans |  |  |  |
Total unrecognized compensation cost |  | $ 7,500 |  |
Restricted stock | Common Stock [Member] | 2016 Triton Plan [Member] |  |  |  |
Stock based compensation plans |  |  |  |
Number of Shares Tendered by Plan Participants in Connection with Option Exercises | 5,000,000 |  |  |

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