Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
NET INCOME		$ 7,900	$ 23,994	$ 38,899
Other comprehensive income (loss), net of tax:
Reclassification adjustment for realized gains on marketable securities included in net income (1)	[1]			(2,059)
Reclassification adjustment for unrealized losses on marketable securities included in net income (2)	[2]			26
Changes in fair value of marketable securities (3)	[3]			2,001
COMPREHENSIVE INCOME		$ 7,900	$ 23,994	$ 38,867

[1] Net of deferred income taxes of $0, $0, and $(1,326), respectively.

[2] Net of deferred income taxes of $0, $0, and $16, respectively.

[3] Net of deferred income taxes of $0, $0, and $(687), respectively.