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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Comprehensive Income
Net income	$ 1,465,711	$ 1,693,300	$ 727,821
Unrealized appreciation (decline) in value of available-for-sale investments:
Unrealized holding gains (losses) arising during year	678,717	500,771	(270,057)
Reclassification of net realized (gains) losses, included in net income	(426,187)	(118,941)	144,573
Foreign currency translation adjustments	33,336	18,110	(24,830)
Comprehensive income	1,751,577	2,093,240	577,507
Net (income) loss attributable to noncontrolling interests	(60,190)	(56,981)	30,150
Other comprehensive (income) loss attributable to noncontrolling interests	(9,062)	(9,130)	3,346
Comprehensive income available to Arch	$ 1,682,325	$ 2,027,129	$ 611,003

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