Leases Supplemental lease information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Lease, Cost	$ 3,166
Operating lease right-of-use assets	13,168	$ 7,600	$ 0
Short-term Lease, Cost	$ 159
Operating Lease, Weighted Average Remaining Lease Term	7 years 2 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	3.50%
Operating Lease, Payments, Use	$ 18,034