Consolidated Statements of Cash Flows - 10K (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net earnings	$ 135,445	$ 126,255	$ 103,346
Adjustments to reconcile net earnings to net cash provided by operating activities
Net realized investment gains	(32,182)	(22,036)	(25,372)
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Other items, net	10,818us-gaap_OtherNoncashIncomeExpense	13,104us-gaap_OtherNoncashIncomeExpense	7,732us-gaap_OtherNoncashIncomeExpense
Change in:
Accrued investment income	1,081	(1,307)	(538)
Premiums and reinsurance balances receivable (net of direct write-offs and commutations)	(2,064)	(13,154)	(14,859)
Reinsurance balances payable	(9,321)	3,375	(6,902)
Funds held	(10,175)rli_IncreaseDecreaseInFundsHeld	5,023rli_IncreaseDecreaseInFundsHeld	(53,922)rli_IncreaseDecreaseInFundsHeld
Ceded unearned premium	6,446	12,785	(11,563)
Reinsurance balances recoverable on unpaid losses	19,818	4,960	(6,079)
Deferred policy acquisition costs	(3,615)	(9,164)	(239)
Accrued expenses	3,552	9,663	(8,950)
Unpaid losses and settlement expenses	(8,393)	(29,050)	7,769
Unearned premiums	9,331	22,735	28,079
Income taxes
Current	(155)	5,966	14,536
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Stock option excess tax benefit	(1,766)	(6,310)	(1,471)
Changes in investment in unconsolidated investees:
Undistributed earnings	(12,338)	(10,915)	(8,853)
Dividends received	6,600	13,200	6,600
Net proceeds from trading portfolio activity		6
Net cash provided by (used in) operating activities	123,085	134,966	36,240
Purchase of:
Fixed income, held-to-maturity			(25,078)
Fixed income, available-for-sale	(470,210)	(545,899)	(632,955)
Equity securities, available-for-sale	(18,088)	(31,010)	(34,113)
Short-term investments, net			(6,597)
Property and equipment	(7,121)	(17,531)	(15,292)
Acquisition of Rockbridge Underwriting Agency			(15,500)
Investment in equity method investee	(5,301)
Other	(5,534)rli_PaymentsForOtherInvestingActivities		(400)rli_PaymentsForOtherInvestingActivities
Proceeds from sale of:
Fixed income, held-to-maturity	654
Fixed income, available-for-sale	342,308	173,694	181,338
Equity securities, available-for-sale	72,869	73,982	78,315
Short-term investments, net	11,401	7,230
Property and equipment	276	1,492	684
Other		400
Proceeds from call or maturity of:
Fixed income, held-to-maturity		11,090	273,816
Fixed income, available-for-sale	101,517	224,620	248,134
Net cash provided by (used in) investing activities	22,771	(101,932)	52,352
Cash Flows from Financing Activities
Stock option excess tax benefit	1,766	6,310	1,471
Proceeds from stock option exercises	3,386	318	6,104
Proceeds from issuance of senior notes		149,571
Payment on senior notes		(99,504)us-gaap_RepaymentsOfLongTermDebt
Debt issue costs paid		(1,437)us-gaap_PaymentsOfDebtIssuanceCosts
Cash dividends paid	(159,857)us-gaap_PaymentsOfDividendsCommonStock	(93,137)us-gaap_PaymentsOfDividendsCommonStock	(133,037)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities	(154,705)	(37,879)	(125,462)
Net increase (decrease) in cash	(8,849)	(4,845)	(36,870)
Cash at the beginning year	39,469	44,314	81,184
Cash at end of year	$ 30,620	$ 39,469	$ 44,314

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- Definition

The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

+ Details

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Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are 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

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-Paragraph 11

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

+ 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

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-Publisher FASB

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-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Amount of cash inflow (outflow) from sales and purchases of trading securities.

+ References

Reference 1: 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=6871852&loc=d3e26853-111562

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- Definition

The cash inflow associated with the sale of debt 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

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow associated with the sale of 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

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-Publisher FASB

-Name Accounting Standards Codification

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-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer.

+ 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

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

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- Definition

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Paragraph 2

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity and any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and/or investments that are separately or otherwise not categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

No definition available.

+ Details

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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