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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenues:    
Net premiums $ 2,365,696 $ 2,157,005
Investment income, net of related expenses 514,364 417,266
Investment related gains (losses), net:    
Other-than-temporary impairments on fixed maturity securities (17,189) (33,817)
Other investment related gains (losses), net 77,712 (87,069)
Total investment related gains (losses), net 60,523 (120,886)
Other revenues 68,157 59,183
Total revenues 3,008,740 2,512,568
Benefits and Expenses:    
Claims and other policy benefits 2,106,145 1,886,764
Interest credited 107,684 87,905
Policy acquisition costs and other insurance expenses 379,389 233,763
Other operating expenses 158,506 157,424
Interest expense 42,402 32,807
Collateral finance and securitization expense 6,770 6,325
Total benefits and expenses 2,800,896 2,404,988
Income before income taxes 207,844 107,580
Provision for income taxes 62,332 31,108
Net income $ 145,512 $ 76,472
Earnings per share:    
Basic earnings per share $ 2.26 $ 1.18
Diluted earnings per share 2.22 1.17
Dividends declared per share $ 0.41 $ 0.37