Accumulated Other Comprehensive Loss - Summary of the Tax Effects Allocated to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Loss
Reclassification adjustment for net gain included in earnings before-tax amount	$ (15)	$ (4)
Reclassification adjustment for net gain included in earnings, Tax (expense) or benefit	4	1
Reclassification adjustment for net gain included in earnings net-of-tax amount	(11)	(3)
Total before income taxes	351	(743)
Other comprehensive loss, Tax (expense) or benefit	(89)	188
Total other comprehensive income (loss), net of tax	262	(555)
Accumulated Other Comprehensive Loss.
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Net-of-tax amount	273
Reclassification adjustment for net gain included in earnings net-of-tax amount	(11)
Total other comprehensive income (loss), net of tax	262	(555)
Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Net-of-tax amount	(1)
Reclassification adjustment for net gain included in earnings net-of-tax amount	(11)
Total other comprehensive income (loss), net of tax	(12)
Unrealized loss Cash flow hedge, Interest rate swap
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Net-of-tax amount	274
Total other comprehensive income (loss), net of tax	274
Unrealized loss Cash flow hedge, Interest rate swap | Interest rate swap
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount	157	(729)
Unrealized loss on investments, Tax (expense) or benefit	(40)	185
Unrealized loss on investments, Net-of-tax amount	117	(544)
Unrealized loss Cash flow hedge, Interest rate swap | Interest rate swap, unconsolidated affiliates
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount	211
Unrealized loss on investments, Tax (expense) or benefit	(54)
Unrealized loss on investments, Net-of-tax amount	157
Unrestricted available-for-sale, Debt securities | Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount	(2)
Unrealized loss on investments, Tax (expense) or benefit	1
Unrealized loss on investments, Net-of-tax amount	$ (1)
Restricted | Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount		(10)
Unrealized loss on investments, Tax (expense) or benefit		2
Unrealized loss on investments, Net-of-tax amount		$ (8)