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Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating Lease, Cost $ 29,635  
Short-term Lease, Cost 336  
Operating Lease, Payments 29,720  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 3,710  
Operating Lease, Right-of-Use Asset 919,583 $ 0
Operating Lease, Liability, Current 63,815 0
Operating Lease, Liability, Noncurrent 855,768 $ 0
Operating Lease, Liability $ 919,583  
Operating Lease, Weighted Average Remaining Lease Term 20 years 2 months  
Operating Lease, Weighted Average Discount Rate, Percent 9.30%