CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income:		$ 31,602	$ 59,236	$ 15,464
Other comprehensive income (loss):
Reclassification of net realized loss (gain) included in earnings		1,061	(10,750)	(795)
Reclassification into retained earnings	[1]	932
Reclassification of other-than-temporary impairment loss included in earnings		2,330	2,288
Total before income taxes		1,472	(6,456)	5,196
Income tax (expense) benefit	[2]	(685)	2,488	(2,003)
Total other comprehensive income (loss), net of tax		787	(3,968)	3,193
Total comprehensive income, net of tax		32,389	55,268	18,657
Unrestricted available-for-sale, Debt securities
Other comprehensive income (loss):
Net unrealized (loss) gain on investments		(2,845)
Unrestricted available-for-sale, Debt and equity securities
Other comprehensive income (loss):
Net unrealized (loss) gain on investments			2,015	5,997
Restricted
Other comprehensive income (loss):
Net unrealized (loss) gain on investments		$ (6)	$ (9)	$ (6)

[1] The reclassification into retained earnings relates to the adoption of ASU 2016-01. The new guidance was effective January 1, 2018, and required equity investments to be measured at fair value with changes in fair value recognized in results of operations rather than the consolidated statements of comprehensive income. See Note 2. Summary of Significant Accounting Policies.

[2] Income tax expense for the year ended December 31, 2018 includes $0.3 million of income tax expense related to the adoption of ASU 2018-02. The new guidance was effective January 1, 2018, and allowed a reclassification from accumulated other comprehensive loss to retained earnings for stranded tax effects resulting from the Tax Act. See Note 2. Summary of Significant Accounting Policies.