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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net cash provided by (used in) operating activities $ 56,589 $ 224,454
Cash flows from investing activities:    
Proceeds from sale of property and equipment 27 30
Purchases of property and equipment (9,723) (6,141)
Purchases of equity securities (1,091) (23,568)
Purchases of available-for-sale debt securities (194,228) (349,617)
Purchases of investment real estate, net (883) (5,553)
Proceeds from sales of equity securities 29,137 8,285
Proceeds from sales of available-for-sale debt securities 73,041 132,801
Proceeds from sales of investment real estate 10,537 0
Maturities of available-for-sale debt securities 100,304 83,188
Maturities of available-for-sale short-term investments 0 10,000
Net cash provided by (used in) investing activities 7,121 (150,575)
Cash flows from financing activities:    
Preferred stock dividend (8) (8)
Common stock dividend (16,618) (15,400)
Issuance of common stock for stock option exercises 239 102
Purchase of treasury stock (49,932) (11,116)
Payments related to tax withholding for share-based compensation (3,078) (7,551)
Repayment of debt (1,103) (1,103)
Net cash provided by (used in) financing activities (70,500) (35,076)
Cash and cash equivalents, and restricted cash and cash equivalents:    
Net increase (decrease) during the period (6,790) 38,803
Balance, beginning of period 169,063 216,121
Balance, end of period 162,273 254,924
Cash and cash equivalents, and restricted cash and cash equivalents within the Consolidated Balance Sheets    
Total cash and cash equivalents and restricted cash and cash equivalents $ 169,063 $ 216,121