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Leases Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease, Cost $ 3,800 $ 7,600    
Operating Lease, Payments   8,100    
Lessee Operating Lease Leases Not Yet Commenced Amount 16,600 16,600    
Right-of-use leased assets $ 54,189 $ 54,189 $ 50,800 $ 0
Operating Lease, Weighted Average Remaining Lease Term 6 years 6 years    
Operating Lease, Liability, Current $ 14,241 $ 14,241    
Operating lease liabilities, net of current 54,617 54,617   $ 0
Landlord funded tenant improvements 10,555 10,555    
Deferred Rent Credit, Noncurrent $ 4,114 $ 4,114    
Operating Lease, Weighted Average Discount Rate, Percent 4.70% 4.70%    
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 8,578 $ 8,578    
Lessee, Operating Lease, Liability, Payments, Due Year Two 16,035 16,035    
Lessee, Operating Lease, Liability, Payments, Due Year Three 13,185 13,185    
Lessee, Operating Lease, Liability, Payments, Due Year Four 11,637 11,637    
Lessee, Operating Lease, Liability, Payments, Due Year Five 9,286 9,286    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 20,606 20,606    
Lessee, Operating Lease, Liability, Payments, Due 79,327 79,327    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 10,469 10,469    
Operating Lease, Liability $ 68,858 $ 68,858 $ 63,700  
Minimum [Member]        
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 4 years 4 years    
Maximum [Member]        
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 7 years 7 years