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Chief Executive Officer Succession Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 6 Months Ended
Nov. 05, 2018
Dec. 31, 2018
Nov. 04, 2018
Dec. 31, 2018
CEO [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash separation payment   $ 9,080 $ 34,295 $ 33,051
Continuation costs     $ 208  
Former CEO [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Consulting fees $ 975      
Former CEO [Member] | Chief Executive Officer Succession Plan expense, net        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Consulting fees   $ 650   $ 650