Leases Supplemental Balance Sheet Information Related To Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease assets	$ 85,327	$ 0
Accrued liabilities	17,923
Long-term operating lease liabilities	79,091	$ 0
Operating lease liability	97,014
Other long-lived assets, at cost	848
Accumulated depreciation	(443)
Other long-lived assets, net	$ 405