Leases (Components of Lease Cost) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lease cost:
Amortization of right-of-use assets	$ 1,912
Interest expense on lease liabilities	543
Total lease cost	22,632
Cost of sales and merchandising revenues
Lease cost:
Operating lease cost	13,120
Operating, administrative and general expenses
Lease cost:
Operating lease cost	6,834
Other lease cost	199
Interest expense
Lease cost:
Other lease cost	$ 24