Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Insurance revenues:    
Net premiums $ 40,976 $ 41,787
Contract charges 28,392 28,798
Total insurance revenues 69,368 70,585
Investment revenues:    
Net investment income 39,692 40,691
Net realized investment gains (losses), excluding other-than-temporary impairment losses (28) 1,665
Net impairment losses recognized in earnings:    
Total other-than-temporary impairment losses 0 (213)
Portion of impairment losses recognized in other comprehensive income (7) 51
Net other-than-temporary impairment losses recognized in earnings (7) (162)
Total investment revenues 39,657 42,194
Other revenues 1,780 2,333
Total revenues 110,805 115,112
BENEFITS AND EXPENSES    
Policyholder benefits 50,342 52,754
Interest credited to policyholder account balances 18,439 18,946
Amortization of deferred acquisition costs 8,384 8,828
Operating expenses 24,118 26,620
Total benefits and expenses 101,283 107,148
Income before income tax expense 9,522 7,964
Income tax expense 2,744 2,292
Net income 6,778 5,672
COMPREHENSIVE INCOME, NET OF TAXES    
Change in net unrealized gains on securities available for sale, net of DAC and VOBA 16,020 19,365
Change in future policy benefits (2,989) (3,633)
Change in policyholder account balances (98) (131)
Other comprehensive income 12,933 15,601
COMPREHENSIVE INCOME $ 19,711 $ 21,273
Basic and diluted earnings per share:    
Net income (USD per share) $ 0.63 $ 0.52