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Leases (Schedule of Lease Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Assets    
Operating lease right-of-use assets $ 233,173 $ 0
Finance lease right-of-use assets 10,125  
Total lease assets 243,298  
Liabilities    
Operating lease liabilities, current 49,970 0
Finance lease liabilities, current 4,379  
Operating lease liabilities, long-term 195,149 $ 0
Finance lease liabilities, long-term 5,897  
Total lease liabilities $ 255,395