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Commitments and Contingencies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
individual
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 1998
individual
Loss Contingency [Abstract]          
Number of individuals with benefits | individual 2       3
Supplemental unemployment benefits, severance benefits $ 9,000        
Operating Leases, Future Minimum Payments Due [Abstract]          
2019 16,267        
2020 12,572        
2021 9,774        
2022 7,955        
2023 4,938        
Thereafter 14,815        
Total commitments 66,321        
Rent expense $ 20,800 $ 20,900 $ 20,300    
Forecast [Member] | Accounting Standards Update 2016-02 [Member]          
Loss Contingency [Abstract]          
Lease, asset       $ 77,000  
Lease, liability       $ 77,000