Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating leases:
Operating lease right-of-use assets	$ 57,924	$ 60,600	$ 0
Accrued liabilities and other	12,652	12,000
Operating lease liabilities	47,398	$ 50,700	$ 0
Total operating lease liabilities	$ 60,050