Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases:
Operating lease right-of-use assets	$ 60,149	$ 60,600	$ 0
Accrued liabilities and other	12,659	12,000
Operating lease liabilities	49,632	$ 50,700	$ 0
Total operating lease liabilities	62,291
Finance leases:
Property, plant and equipment	875
Accumulated depreciation	(664)
Net property, plant and equipment	211
Accrued liabilities and other	147
Other liabilities	48
Total finance lease liabilities	$ 195