Leases - Lease Assets and Liabilities Recorded in Statement of Financial Position (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other assets
Assets And Liabilities Lessee [Line Items]
Operating lease assets	$ 22,401	$ 0
Accounts payable and accrued liabilities
Assets And Liabilities Lessee [Line Items]
Operating lease liabilities - current	11,289	0
Other long-term liabilities
Assets And Liabilities Lessee [Line Items]
Operating lease liabilities - long-term	10,665	0
Total liabilities
Assets And Liabilities Lessee [Line Items]
Total operating lease liabilities	$ 21,954	$ 0