Leases (Schedule of Lease Costs) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Finance lease amortization expense	$ 3,396
Finance lease interest expense	325
Operating lease expense	49,408
Short-term lease expense	108,930
Variable lease expense	3,358
Total lease expense	$ 165,417