Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Comprehensive income (loss), net of tax
Net income	$ 93,627	$ 79,277	$ 209,565	$ 121,075
Other comprehensive income (loss)
Net unrealized gain (loss) on securities	60,510	(21,164)	56,541	(6,032)
Reclassification of net realized (gain) loss on securities into earnings	3,201	18,570	(9,678)	(5,056)
Total other comprehensive income (loss)	63,711	(2,594)	46,863	(11,088)
Total comprehensive income	157,338	76,683	256,428	109,987
Comprehensive income attributable to noncontrolling interests	24,975	4,158	29,177	9,981
Comprehensive income attributable to common stockholders	$ 132,363	$ 72,525	$ 227,251	$ 100,006