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 |