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Contingencies (Details) - USD ($)
$ in Thousands
Nov. 19, 2018
Feb. 14, 2018
Case No I6CV02338 Div. 4    
Shareholder Derivative Litigation    
Settlement amount   $ 19,900
Attorney’s fees plus nominal costs associated with notice to shareholders   $ 6,100
Case No. 17-2365 D. Kan    
Shareholder Derivative Litigation    
Settlement amount $ 4,875