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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 24,413 $ 54,771
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 3,072 4,047
Net amortization of premiums on investments in fixed-maturity securities 475 605
Depreciation and amortization 3,968 3,911
Deferred income tax benefits (4,967) (2,111)
Net realized investment (gains) losses (899) 563
Other-than-temporary impairment losses 1,441 3,869
Income from real estate investments   (228)
Gain on repurchases of convertible senior notes (153)  
Gain on bargain purchase (2,071)  
Income from unconsolidated joint venture (153) (4)
Net (income) loss from limited partnership interests (54) 2,862
Net loss on disposal of property and equipment   2
Net loss on disposal or sale of real estate investments 5 24
Foreign currency remeasurement loss 9 54
Changes in operating assets and liabilities:    
Premiums receivable (6,495) (13,954)
Advance premiums 4,894 6,707
Prepaid reinsurance premiums 11,048 7,506
Accrued interest and dividends receivable (305) (446)
Other assets 32,073 (2,722)
Assumed reinsurance balances payable (1,084) 197
Deferred policy acquisition costs (2,619) (8,518)
Losses and loss adjustment expenses 5,505 8,309
Unearned premiums 22,032 20,962
Income taxes 2,510 4,885
Accrued expenses and other liabilities (1,180) 15,039
Net cash provided by operating activities 91,465 106,330
Cash flows from investing activities:    
Investment in real estate under acquisition, development, and construction arrangement   (6,276)
Acquisition of real estate business, net of cash acquired (12,056)  
Investments in limited partnership interests (4,670) (22,486)
Investment in unconsolidated joint venture   (270)
Purchase of property and equipment (543) (565)
Purchase of real estate investments (1,522) (293)
Purchase of fixed-maturity securities (79,232) (93,081)
Purchase of equity securities (13,259) (28,095)
Distribution from limited partnership interests 428 12
Proceeds from investment in real estate under acquisition, development and construction arrangement 10,200  
Proceeds from sales of fixed-maturity securities 37,415 51,510
Proceeds from calls, repayments and maturities of fixed-maturity securities 2,637 5,655
Proceeds from sales of equity securities 14,155 14,111
Proceeds from sales of real estate investments   5
Net cash used in investing activities (46,447) (79,773)
Cash flows from financing activities:    
Proceeds from the exercise of common stock options   263
Cash dividends paid (9,368) (9,638)
Cash dividends received under share repurchase forward contract 561 561
Proceeds from issuance of long-term debt 18,200  
Repurchases of convertible senior notes (11,347)  
Repayment of debt (264)  
Repurchases of common stock (464) (792)
Repurchases of common stock under share repurchase plan (18,023) (1,610)
Debt issuance costs (339)  
Tax benefits on stock-based compensation 176 1,836
Net cash used in financing activities (20,868) (9,380)
Effect of exchange rate changes on cash (8) (51)
Net increase in cash and cash equivalents 24,142 17,126
Cash and cash equivalents at beginning of period 267,738 314,416
Cash and cash equivalents at end of period 291,880 331,542
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 18,824 29,186
Cash paid for interest 6,417 6,406
Non-cash investing and financing activities:    
Unrealized gain (loss) on investments in available-for-sale securities, net of tax 6,662 (2,883)
Details of business acquisition:    
Fair value of assets acquired 14,677  
Less: purchase price (12,250)  
Gain on bargain purchase (2,071)  
Liabilities assumed 356  
Receivable from sales of available-for-sale securities 270 680
Payable on purchases of available-for-sale securities $ 388 $ 399