Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net income	$ 1,952	$ 45,184	$ 122,567	$ 48,340
Unrealized loss on investments available for sale	(413)	0	(413)	0
Comprehensive income	1,539	45,184	122,154	48,340
Less: comprehensive income (loss) attributable to noncontrolling interests	(272)	19,793	(1,199)	19,793
Comprehensive income attributable to the Company	$ 1,811	$ 25,391	$ 123,353	$ 28,547