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Lease Accounting Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
lease
Jun. 30, 2018
USD ($)
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Lease liabilities   $ 126,740    
ROU assets   $ 110,880    
Rent expense $ 5,400   $ 10,800  
Building        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number real estate leases for office locations | lease   42    
ASU 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Lease liabilities       $ 124,000
ROU assets       $ 108,000