Leases (Lease Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Document Period End Date	Mar. 31, 2020
Assets
Operating lease assets	$ 110,000	$ 110,200
Current
Operating lease liabilities	36,900	34,900
Long-term
Operating lease liabilities	75,600	77,900
Finance lease liabilities	$ 14,300	$ 14,800