Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract]
Operating cash outflow from finance leases	$ 8,306	$ 9,861
Financing cash outflow from finance leases	8,323	6,759
Operating cash outflow from operating leases	$ 911	906
Right-of-use assets obtained in exchange for new operating lease liabilities		$ 613