Leases (Summary of Other Lease Information) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 44,730
Operating cash flows from finance leases	102
Financing cash flows from finance leases	160
Right-of-use assets obtained in exchange for lease obligations, Operating leases	$ 311