Income Taxes - Provision and Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 0	$ 0	$ 0
State	680	3,361	2,327
Foreign	350	0	593
Current tax	1,030	3,361	2,920
Deferred:
Foreign	(1,971)	13,850	(127)
Deferred tax	(1,971)	13,850	(127)
Income tax provision (benefit)	$ (941)	$ 17,211	$ 2,793
Effective Income Tax Rate Reconciliation, Percent
Taxes at statutory U.S. federal income tax rate	21.00%	21.00%	21.00%
Nontaxable income of SVC	(21.00%)	(21.00%)	(21.00%)
State and local income taxes, net of federal tax benefit	(0.10%)	(1.10%)	0.70%
Foreign taxes	0.30%	(4.40%)	0.10%
Effective tax rate	0.20%	(5.50%)	0.80%