Accumulated Other Comprehensive Loss - Summary of the Tax Effects Allocated to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount	$ (3)
Unrealized loss on investments, Tax (expense) or benefit	1
Unrealized loss on investments, Net-of-tax amount	(2)
Reclassification adjustment for net loss (gain) included in earnings before-tax amount	82		$ 98	$ (4)
Reclassification adjustment for net loss (gain) included in earnings, Tax (expense) or benefit	(21)		(25)	1
Reclassification adjustment for net loss (gain) included in earnings net-of-tax amount	61		73	(3)
Total before income taxes	(15)	$ (857)	336	(1,600)
Other comprehensive loss, Tax (expense) or benefit	4	217	(85)	405
Total other comprehensive (loss) income, net of tax	(11)	(640)	251	(1,195)
Accumulated Other Comprehensive Loss.
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Net-of-tax amount			178
Reclassification adjustment for net loss (gain) included in earnings net-of-tax amount			73
Total other comprehensive (loss) income, net of tax	(11)	(640)	251	(1,195)
Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Net-of-tax amount			(4)
Reclassification adjustment for net loss (gain) included in earnings net-of-tax amount			(11)
Total other comprehensive (loss) income, net of tax			(15)
Unrealized loss Cash flow hedge, Interest rate swap
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Net-of-tax amount			182
Reclassification adjustment for net loss (gain) included in earnings net-of-tax amount			84
Total other comprehensive (loss) income, net of tax			266
Unrealized loss Cash flow hedge, Interest rate swap | Interest rate swap
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount	(48)	(137)	109	(866)
Unrealized loss on investments, Tax (expense) or benefit	12	35	(27)	220
Unrealized loss on investments, Net-of-tax amount	(36)	(102)	82	(646)
Unrealized loss Cash flow hedge, Interest rate swap | Interest rate swap, unconsolidated affiliates
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount	(46)	(841)	134	(841)
Unrealized loss on investments, Tax (expense) or benefit	12	213	(34)	213
Unrealized loss on investments, Net-of-tax amount	$ (34)	(628)	100	(628)
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		106	(5)	106
Unrealized loss on investments, Tax (expense) or benefit		(27)	1	(27)
Unrealized loss on investments, Net-of-tax amount		79	$ (4)	79
Restricted | Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized loss on investments, Before-tax amount		15		5
Unrealized loss on investments, Tax (expense) or benefit		(4)		(2)
Unrealized loss on investments, Net-of-tax amount		$ 11		$ 3