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Leases - Lease Income and Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Lease income from operating leases - fixed $ 2,149 $ 6,219
Operating lease expense 18,151 51,811
Amortization of lease assets 158 399
Interest on finance lease liabilities 14 59
Subtotal finance lease cost 172 458
Total lease expense $ 18,323 $ 52,269