CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 6,617	$ 1,602
Other comprehensive income (loss), net of tax
Change in fair value of investments in available-for-sale securities, net of tax		0	(578)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax		0	603
Total change in unrealized gains (losses) on investments in available-for-sale securities, net of tax	[1]	0	(1,181)
Total other comprehensive income (loss), net of tax		0	(1,181)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		6,617	421
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest		(63)	0
Comprehensive income		$ 6,680	$ 421

[1] Net of tax of $0 and $(314) for the three months ended