Leases, Supplemental Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease Description, [Line Items]
Weighted average remaining lease term, Operating lease	6 years 8 months 12 days
Weighted average discount rate, Operating lease	4.50%
Operating cash flows from operating leases	$ 9,574
Right of use asset obtained in exchange for operating lease liability	$ 23,680
Minimum [Member]
Lessee, Lease Description, [Line Items]
Remaining lease terms, Operating Lease	1 year
Maximum [Member]
Lessee, Lease Description, [Line Items]
Remaining lease terms, Operating Lease	19 years