Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases:
Operating lease right-of-use assets	$ 57,848	$ 60,600	$ 0
Accrued liabilities and other	14,071	12,000
Operating lease liabilities	45,993	$ 50,700	$ 0
Total operating lease liabilities	$ 60,064