Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Lease payments, leases not yet commenced	$ 34,700
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	35 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Right-of-use asset		$ 210,000
Lease liabilities		$ 210,000