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Fair Value of Financial Instruments (Carrying Value and Estimated Fair Value) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investments |  |  |
Held-to-maturity securities |  | $ 667 | $ 675
Available-for-sale securities |  | 3,092,982 | 3,061,208
Trading securities |  | 17,446 | 16,975
Fair Value [Member] |  |  |
Investments |  |  |
Mortgage loans |  | 4,197 | 4,237
Policy loans |  | 5,348 | 5,618
Other long-term investments |  | 51,815 | 54,151
Short-term investments |  | 175 | 175
Cash and cash equivalents |  | 143,981 | 106,449
Corporate-owned life insurance |  | 2,160 | 1,716
Policy reserves |  |  |
Annuity (accumulations) | [1] | 727,595 | 707,190
Annuity (benefit payments) |  | 137,810 | 131,899
Fair Value [Member] | Fixed Maturities [Member] |  |  |
Investments |  |  |
Held-to-maturity securities |  | 667 | 675
Available-for-sale securities |  | 2,855,166 | 2,824,961
Trading securities |  | 13,000 | 12,622
Fair Value [Member] | Equity Securities [Member] |  |  |
Investments |  |  |
Available-for-sale securities |  | 237,816 | 236,247
Trading securities |  | 4,446 | 4,353
Carrying Value [Member] |  |  |
Investments |  |  |
Mortgage loans |  | 3,899 | 3,961
Policy loans |  | 5,348 | 5,618
Other long-term investments |  | 51,815 | 54,151
Short-term investments |  | 175 | 175
Cash and cash equivalents |  | 143,981 | 106,449
Corporate-owned life insurance |  | 2,160 | 1,716
Policy reserves |  |  |
Annuity (accumulations) | [1] | 728,089 | 744,931
Annuity (benefit payments) |  | 94,659 | 95,467
Carrying Value [Member] | Fixed Maturities [Member] |  |  |
Investments |  |  |
Held-to-maturity securities |  | 664 | 672
Available-for-sale securities |  | 2,855,166 | 2,824,961
Trading securities |  | 13,000 | 12,622
Carrying Value [Member] | Equity Securities [Member] |  |  |
Investments |  |  |
Available-for-sale securities |  | 237,816 | 236,247
Trading securities |  | $ 4,446 | $ 4,353
[1] | Annuity accumulations represent deferred annuity contracts that are currently earning interest.

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