Leases and Lease Commitments - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Dec. 31, 2017
Lessee Lease Description [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 1,041,528	$ 1,090,701	$ 1,096,162		$ 1,294,461
Operating lease liabilities	1,110	1,314		$ 1,600
Operating lease liabilities, long-term	5,845	3,801		3,900
Lease expense recognize on a straight-line basis	2,200
Lease expense incurred	$ 3,800	$ 3,800	$ 5,400
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-02
Lessee Lease Description [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ 5,500