Leases (Schedule of Other Supplemental Information) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 8,798	$ 26,779
Operating cash flows from finance leases	38	125
Financing cash flows from finance leases	222	658
Right-of-use assets obtained in exchange for new lease liabilities:
Right-of-use assets obtained in exchange for lease liabilities, operating leases	2,794	17,961
Right-of-use assets obtained in exchange for lease liabilities, financing leases	$ 39	$ 265
Weighted-average remaining lease term:
Weighted-average remaining lease term, operating leases	4 years 9 months 18 days	4 years 9 months 18 days
Weighted-average remaining lease term, finance leases	16 years 1 month 6 days	16 years 1 month 6 days
Weighted-average discount rate:
Weighted-average discount rate, operating leases	3.23%	3.23%
Weighted-average discount rate, finance leases	2.75%	2.75%