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Leases (Schedule of Lease Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets    
Operating lease right-of-use assets $ 228,131 $ 0
Finance lease right-of-use asset 10,816  
Total lease assets 238,947  
Liabilities    
Operating lease liabilities, current 48,776 0
Finance lease liabilities, current 4,524  
Operating lease liabilities, long-term 191,226 $ 0
Finance lease liabilities, long-term 6,386  
Total lease liabilities $ 250,912