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Leases - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Renewal term 10 years    
Right-of-use assets, net $ 327,419    
Total lease liabilities, net 371,904    
Operating lease, cost 34,100    
Short-term and variable lease cost $ 9,000    
Rental expense   $ 127,100  
Minimum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease term 14 years    
Accounting Standards Update 2016-02      
Lessee, Lease, Description [Line Items]      
Right-of-use assets, net     $ 343,000
Total lease liabilities, net     $ 390,000