Other assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract
Net deferred tax assets (net of valuation allowance)	$ 882,230	$ 886,353
Investments under the equity method	239,860	237,081
Prepaid taxes	40,077	47,226
Other prepaid expenses	84,717	82,425
Derivative assets	18,080	17,966
Trades receivables from brokers and counterparties	67,124	47,049
Principal, interest and escrow servicing advances	72,721	77,800
Guaranteed mortgage loan claims receivable	89,763	108,946
Operating ROU assets	149,855	149,849
Finance ROU assets	17,143	12,888
Others	155,136	152,032
Total other assets	$ 1,816,706	$ 1,819,615