Revenue - Contract Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Change in Contract with Customer, Asset [Abstract]
Balance at December 31, 2020	$ 3,529
Estimated lifetime value of insurance policies sold by carriers	3,816
Cash receipts	(966)
Balance at June 30, 2021	6,379
Contract assets	6,379
Long-term accounts receivable	6,140
Accounts Receivable Current
Change in Contract with Customer, Asset [Abstract]
Balance at June 30, 2021	239
Contract assets	$ 239