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Leases (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]    
Option to extend, additional periods 5 years  
Operating lease payments related to options to extend lease terms $ 2,085,168  
Operating minimum lease payments 137,000 $ 90,484
Future sublease income $ 9,704 11,790
Number of sale leaseback transactions | item 6  
Financing liability $ 2,263 $ 2,390
Minimum [Member]    
Operating Leased Assets [Line Items]    
Lessee, Operating Lease, Term of Contract 1 year  
Maximum [Member]    
Operating Leased Assets [Line Items]    
Lessee, Operating Lease, Term of Contract 20 years