Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 211,211	$ 221,300
Cash flows from investing activities:
Sale of investment securities	21,011	23,477
Maturities of investment securities	36,357	36,461
Purchase of investment securities	(39,000)	(74,805)
Proceeds from sale or liquidation of long-term investments	1,101	8,009
Purchase of long-term investments	(1,000)	(6,963)
Investments in real estate ventures	(10,456)	(9,902)
Distributions from investments in real estate ventures	3,641	11,163
Increase in cash surrender value of life insurance policies	(1,282)	(1,348)
Increase in restricted assets	0	(5)
Issuance of notes receivable	(10)	0
Capital expenditures	(2,911)	(3,055)
Paydowns of investment securities	114	302
Net cash provided by (used in) investing activities	7,565	(16,666)
Cash flows from financing activities:
Proceeds from issuance of debt	0	875,000
Deferred financing costs	0	(20,109)
Repayments of debt	(17)	(856,316)
Borrowings under revolving credit facility	67,373	7,699
Repayments on revolving credit facility	(67,375)	(7,699)
Dividends on common stock	(63,327)	(63,738)
Other	(938)	(51)
Net cash used in financing activities	(64,284)	(65,214)
Net increase in cash, cash equivalents and restricted cash	154,492	139,420
Cash, cash equivalents and restricted cash, beginning of period	194,849	365,677
Cash, cash equivalents and restricted cash, end of period	$ 349,341	$ 505,097