Leases (Components of Lease Expense) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 104,007
Short-term and month-to-month lease cost	19,267
Variable lease cost	20,582
Sublease income	(20,108)
Total net lease cost	$ 123,748