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Summary of Investments (Net Realized Investment Gains and Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | $ 2,055 | $ 887
Available-for-sale Securities [Abstract] |  |
Proceeds from sales | 1,968 | 5,017
Gross realized gains | 921 | 973
Gross realized losses | 0 | 0
Fixed Maturities [Member] | Available-for-sale [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | 516 | 991
Fixed Maturities [Member] | Trading Securities, Change in Fair Value [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | 273 | (201)
Fixed Maturities [Member] | Trading Securities, Sales [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | 0 | 516
Equity Securities [Member] | Available-for-sale [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | 984 | 904
Equity Securities [Member] | Trading Securities, Change in Fair Value [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | 93 | (56)
Equity Securities [Member] | Trading Securities, Sales [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | 0 | 46
Other Long-term Investments [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | 43 | (1,313)
Cash Equivalents [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Net realized investment gains (losses) | $ 146 | $ 0

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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