Leases (Schedule of Other Supplemental Information) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 9,175
Operating cash flows from finance leases	46
Financing cash flows from finance leases	217
Right-of-use assets obtained in exchange for new lease liabilities:
Right-of-use assets obtained in exchange for lease liabilities, operating leases	$ 3,678
Weighted-average remaining lease term:
Weighted-average remaining lease term, operating leases	5 years
Weighted-average remaining lease term, finance leases	16 years 1 month 6 days
Weighted-average discount rate:
Weighted-average discount rate, operating leases	3.24%
Weighted-average discount rate, finance leases	3.29%