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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net cash provided by (used in) operating activities	$ 224,454	$ 286,195
Cash flows from investing activities:
Proceeds from sale of property and equipment	30	17
Purchases of property and equipment	(6,141)	(3,655)
Purchases of equity securities	(23,568)	(47,070)
Purchases of available-for-sale debt securities	(349,617)	(114,593)
Purchases of investment real estate, net	(5,553)	(5,023)
Proceeds from sales of equity securities	8,285	75,027
Proceeds from sales of available-for-sale debt securities	132,801	19,643
Maturities of available-for-sale debt securities	83,188	75,770
Maturities of available-for-sale short-term investments	10,000	5,000
Net cash provided by (used in) investing activities	(150,575)	5,116
Cash flows from financing activities:
Preferred stock dividend	(8)	(8)
Common stock dividend	(15,400)	(9,803)
Issuance of common stock for stock option exercises	102
Purchase of treasury stock	(11,116)	(17,884)
Payments related to tax withholding for share-based compensation	(7,551)	(1,367)
Repayment of debt	(1,103)	(1,803)
Net cash provided by (used in) financing activities	(35,076)	(30,865)
Cash and cash equivalents, and restricted cash and cash equivalents:
Net increase (decrease) during the period	38,803	260,446
Balance, beginning of period	216,121	108,365
Balance, end of period	$ 254,924	$ 368,811

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