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Leases (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 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 $ 2,082,123  
Operating minimum lease payments 87,500 $ 90,484
Minimum sublease income $ 9,672 11,790
Number of sale leaseback transactions | item 6  
Financing liability $ 2,327 $ 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