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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Feb. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Contract compliance      
Loss Contingencies [Line Items]      
Contracts loss contingency accrual   $ 7,800 $ 5,800
Subsequent event      
Loss Contingencies [Line Items]      
Payments for legal settlements $ 3,750