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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