Other assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract
Net deferred tax assets (net of valuation allowance)	$ 745,613	$ 851,592
Investments under the equity method	273,088	250,467
Prepaid taxes	52,373	32,615
Other prepaid expenses	76,761	74,572
Derivative assets	23,573	20,785
Trades receivables from brokers and counterparties	78,664	65,429
Receivables from investment maturities	50,000	0
Principal, interest and escrow servicing advances	60,347	65,671
Guaranteed mortgage loan claims receivable	91,189	80,477
Operating ROU assets	124,223	131,921
Finance ROU assets	14,409	15,464
Others	159,911	148,048
Total other assets	$ 1,750,151	$ 1,737,041