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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Leases [Abstract]        
Operating Lease, Payments   $ 22,963    
Prepaid expenses and other current assets $ 31,275 31,275 $ 23,425 $ 24,483
Lessee, Operating Lease, Liability, Payments, Due 23,422 23,422    
Operating Lease, Cost 11,544 22,901    
Short-term Lease, Cost 9 16    
Sublease Income 147 277    
Operating Lease, Right-of-Use Asset $ 179,320 $ 179,320 0 0
Operating Lease, Weighted Average Remaining Lease Term 5 years 10 months 24 days 5 years 10 months 24 days    
Operating Lease, Weighted Average Discount Rate, Percent 4.40% 4.40%    
Operating Lease, Liability, Current $ 38,652 $ 38,652 0 0
Operating Lease, Liability, Noncurrent 154,643 154,643 $ 0 $ 0
Operating Lease, Liability 193,295 193,295    
Lease, Cost 11,406 22,640    
Lessee, Operating Lease, Liability, Payments, Due Year Two 45,349 45,349    
Lessee, Operating Lease, Liability, Payments, Due Year Three 39,084 39,084    
Lessee, Operating Lease, Liability, Payments, Due Year Four 30,762 30,762    
Lessee, Operating Lease, Liability, Payments, Due Year Five 22,397 22,397    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 58,679 58,679    
Lessee, Operating Lease, Liability, Payments, Due 219,693 219,693    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 26,398 26,398    
Operating Lease, Liability $ 193,295 $ 193,295