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Leases - Other Information Related to Leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Leases [Abstract]    
Operating cash flows from operating leases $ 20,100  
Operating cash flows from finance leases 55  
Financing cash flows from finance leases 232 $ 0
Lease liabilities arising from new ROU assets, Operating leases 7,679  
Lease liabilities arising from new ROU assets, Finance leases $ 81  
Weighted Average remaining lease term, Operating leases 9 years 6 months  
Weighted Average remaining lease term, Finance leases 2 years 8 months 12 days  
Weighted Average Discount Rate, Operating leases 5.70%  
Weighted Average Discount Rate, Finance leases 4.60%