Selective Insurance (SIGI) 10-Q 29 Oct 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 15, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Entity Registrant Name	SELECTIVE INSURANCE GROUP INC
Entity Central Index Key	230,557
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock , Shares Outstanding		57,195,450

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Fixed income securities, held-to-maturity – at carrying value (fair value: $240,388 – 2015; $333,961 – 2014)	$ 229,869	$ 318,137
Fixed income securities, available-for-sale – at fair value (amortized cost: $4,273,771 – 2015; $3,975,786 – 2014)	4,351,046	4,066,122
Equity securities, available-for-sale – at fair value (cost: $220,820 – 2015; $159,011 – 2014)	221,951	191,400
Short-term investments (at cost which approximates fair value)	125,855	131,972
Other investments	85,146	99,203
Total investments	5,013,867	4,806,834
Cash	15,113	23,959
Interest and dividends due or accrued	38,009	38,901
Premiums receivable, net of allowance for uncollectible accounts of: $4,612 – 2015; $4,137 – 2014	653,966	558,778
Reinsurance recoverables, net	561,364	581,548
Prepaid reinsurance premiums	148,634	146,993
Deferred federal income tax	93,062	98,449
Property and equipment – at cost, net of accumulated depreciation and amortization of: $184,406 – 2015; $172,183 – 2014	65,657	59,416
Deferred policy acquisition costs	213,666	185,608
Goodwill	7,849	7,849
Other assets	86,930	73,215
Total assets	6,898,117	6,581,550
Liabilities And Stockholders' Equity
Reserve for loss and loss expenses	3,517,751	3,477,870
Unearned premiums	1,218,884	1,095,819
Notes payable	394,309	379,297
Current federal income tax	12,607	3,921
Accrued salaries and benefits	158,044	158,382
Other liabilities	237,500	190,675
Total liabilities	5,539,095	5,305,964
Stockholders' Equity:
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding	0	0
Common stock of $2 par value per share: Authorized shares: 360,000,000; Issued: 100,673,864 – 2015; 99,947,933 – 2014	201,348	199,896
Additional paid-in capital	320,987	305,385
Retained earnings	1,409,536	1,313,440
Accumulated other comprehensive (loss) income	(6,039)	19,788
Treasury stock - at cost (shares: 43,492,212 – 2015; 43,353,181 – 2014)	(566,810)	(562,923)
Total stockholders' equity	$ 1,359,022	$ 1,275,586
Commitments and contingencies
Total liabilities and stockholders' equity	$ 6,898,117	$ 6,581,550

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fixed income securities, held-to-maturity, fair value	$ 240,388	$ 333,961
Fixed income securities, available-for-sale, amortized cost	4,273,771	3,975,786
Equity securities, available-for-sale, cost	220,820	159,011
Premiums receivable, allowance for uncollectible accounts	4,612	4,137
Property and equipment - at cost, accumulated depreciation and amortization	$ 184,406	$ 172,183
Preferred stock, par value per share	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 2	$ 2
Common stock, shares authorized	360,000,000	360,000,000
Common stock, shares issued	100,673,864	99,947,933
Treasury stock - at cost, shares	43,492,212	43,353,181

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Net premiums earned	$ 507,390	$ 462,639	$ 1,473,822	$ 1,382,759
Net investment income earned	32,061	34,292	91,208	106,600
Net realized gains:
Net realized investment gains	1,590	15,231	23,598	28,370
Other-than-temporary impairments	(1,282)	0	(7,827)	(1,382)
Total net realized gains	308	15,231	15,771	26,988
Other income	698	3,196	5,521	14,931
Total revenues	540,457	515,358	1,586,322	1,531,278
Expenses:
Loss and loss expense incurred	285,161	270,932	861,721	889,273
Policy acquisition costs	174,802	158,101	509,295	462,540
Interest expense	5,489	5,558	16,458	16,544
Other expenses	9,166	5,441	29,954	22,990
Total expenses	474,618	440,032	1,417,428	1,391,347
Income before federal income tax	65,839	75,326	168,894	139,931
Federal income tax expense:
Current	9,141	7,373	29,128	22,692
Deferred	9,702	14,791	19,294	16,762
Total federal income tax expense	18,843	22,164	48,422	39,454
Net income	$ 46,996	$ 53,162	$ 120,472	$ 100,477
Earnings per share:
Basic net income	$ 0.82	$ 0.94	$ 2.11	$ 1.79
Diluted net income	0.81	0.93	2.08	1.75
Dividends to stockholders	$ 0.14	$ 0.13	$ 0.42	$ 0.39

Consolidation Statements of Com

Consolidation Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income	$ 46,996	$ 53,162	$ 120,472	$ 100,477
Unrealized holding gains (losses) arising during period	5,442	(8,988)	(18,132)	41,767
Amount reclassified into net income: Held-to-maturity securities	(63)	(243)	(353)	(683)
Amount reclassified into net income: Non-credit other-than-temporary impairments	0	780	232	1,085
Amount reclassified into net income: Realized gains on available-for-sale securities	(199)	(10,683)	(10,906)	(18,637)
Total unrealized gains (losses) on investment securities	5,180	(19,134)	(29,159)	23,532
Amount reclassified into net income: Net actuarial loss	1,110	247	3,332	742
Total defined benefit pension and post-retirement plans	1,110	247	3,332	742
Other comprehensive income (loss)	6,290	(18,887)	(25,827)	24,274
Comprehensive income	$ 53,286	$ 34,275	$ 94,645	$ 124,751

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Accumulated other comprehensive (loss) income [Member]	Treasury stock [Member]
Beginning of year at Dec. 31, 2013		$ 198,240	$ 288,182	$ 1,202,015	$ 24,851	$ (559,360)
Dividend reinvestment plan (shares: 38,947 – 2015; 44,322 - 2014)		89	957
Stock purchase and compensation plans (shares: 686,984 - 2015; 588,858 - 2014)		1,178	11,286
Net income	$ 100,477			100,477
Dividends to stockholders ($0.42 per share - 2015; $0.39 per share - 2014)				(22,344)
Other comprehensive (loss) income	24,274				24,274
Acquisition of treasury stock (shares: 139,031 - 2015; 130,573 - 2014)						(2,920)
End of period at Sep. 30, 2014	1,266,925	199,507	300,425	1,280,148	49,125	(562,280)
Beginning of year at Dec. 31, 2014	1,275,586	199,896	305,385	1,313,440	19,788	(562,923)
Dividend reinvestment plan (shares: 38,947 – 2015; 44,322 - 2014)		78	1,014
Stock purchase and compensation plans (shares: 686,984 - 2015; 588,858 - 2014)		1,374	14,588
Net income	120,472			120,472
Dividends to stockholders ($0.42 per share - 2015; $0.39 per share - 2014)				(24,376)
Other comprehensive (loss) income	(25,827)				(25,827)
Acquisition of treasury stock (shares: 139,031 - 2015; 130,573 - 2014)						(3,887)
End of period at Sep. 30, 2015	$ 1,359,022	$ 201,348	$ 320,987	$ 1,409,536	$ (6,039)	$ (566,810)

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	Oct. 28, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Dividend reinvestment plan, shares				38,947	44,322
Stock purchase and compensation plans, shares				686,984	588,858
Dividends to stockholders, per share	$ 0.15	$ 0.14	$ 0.13	$ 0.42	$ 0.39
Acquisition of treasury stock, shares				139,031	130,573
Preferred stock, par value per share		$ 0	$ 0	$ 0	$ 0	$ 0
Preferred stock, shares authorized		5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued		0	0	0	0	0
Series A Preferred Stock [Member]
Preferred stock, par value per share		$ 0	$ 0	$ 0	$ 0
Preferred stock, shares authorized		300,000	300,000	300,000	300,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flow - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities
Net income	$ 120,472	$ 100,477
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,868	31,059
Sale of renewal rights	0	(8,000)
Stock-based compensation expense	7,626	7,421
Undistributed losses (gains) of equity method investments	781	(131)
Net realized gains	(15,771)	(26,988)
Changes in assets and liabilities:
Increase in reserve for loss and loss expenses, net of reinsurance recoverables	60,065	86,887
Increase in unearned premiums, net of prepaid reinsurance	121,424	68,935
Decrease in net federal income taxes	27,980	33,596
Increase in premiums receivable	(95,188)	(66,816)
Increase in deferred policy acquisition costs	(28,058)	(16,700)
Decrease (increase) in interest and dividends due or accrued	979	(82)
Decrease in accrued salaries and benefits	(338)	(13,958)
Increase (decrease) in accrued insurance expenses	7,154	(12,545)
Increase (decrease) in other assets and other liabilities	8,039	(25,036)
Net adjustments	138,561	57,642
Net cash provided by operating activities	259,033	158,119
Investing Activities
Purchase of fixed income securities, available-for-sale	(731,154)	(560,493)
Purchase of equity securities, available-for-sale	(192,717)	(185,529)
Purchase of other investments	(6,589)	(8,498)
Purchase of short-term investments	(1,084,794)	(1,082,192)
Sale of fixed income securities, available-for-sale	22,323	35,499
Sale of short-term investments	1,090,911	1,074,850
Redemption and maturities of fixed income securities, held-to-maturity	79,972	56,375
Redemption and maturities of fixed income securities, available-for-sale	403,510	336,939
Sale of equity securities, available-for-sale	148,228	186,001
Distributions from other investments	22,038	13,514
Purchase of property and equipment	(11,869)	(9,178)
Sale of renewal rights	0	8,000
Net cash used in investing activities	(260,141)	(134,712)
Financing Activities
Dividends to stockholders	(22,848)	(20,899)
Acquisition of treasury stock	(3,887)	(2,920)
Net proceeds from stock purchase and compensation plans	6,016	3,554
Proceeds from borrowings	15,000	0
Excess tax benefits from share-based payment arrangements	1,498	1,024
Repayments of capital lease obligations	(3,517)	(1,858)
Net cash used in financing activities	(7,738)	(21,099)
Net (decrease) increase in cash	(8,846)	2,308
Cash, beginning of year	23,959	193
Cash, end of period	$ 15,113	$ 2,501

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Basis of Presentation And Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation As used herein, the "Company,” “we,” “us,” or “our” refers to Selective Insurance Group, Inc. (the "Parent"), and its subsidiaries, except as expressly indicated or unless the context otherwise requires. Our interim unaudited consolidated financial statements (“Financial Statements”) have been prepared by us in conformity with U.S. generally accepted accounting principles (“GAAP”) and the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. The preparation of the Financial Statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported financial statement balances, as well as the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. All significant intercompany accounts and transactions between the Parent and its subsidiaries are eliminated in consolidation. Our Financial Statements reflect all adjustments that, in our opinion, are normal, recurring, and necessary for a fair presentation of our results of operations and financial condition. Our Financial Statements cover the third quarters ended September 30, 2015 (“ Third Quarter 2015 ”) and September 30, 2014 (“ Third Quarter 2014 ”) and the nine -month periods ended September 30, 2015 (" Nine Months 2015 ") and September 30, 2014 (" Nine Months 2014 "). The Financial Statements do not include all of the information and disclosures required by GAAP and the SEC for audited annual financial statements. Results of operations for any interim period are not necessarily indicative of results for a full year. Consequently, our Financial Statements should be read in conjunction with the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2014 (“ 2014 Annual Report ”) filed with the SEC.

Accounting Pronouncements

Accounting Pronouncements	9 Months Ended
	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Accounting Pronouncements	Accounting Pronouncements In June 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (“ASU 2014-12”). ASU 2014-12 requires that performance targets that affect vesting and could be achieved after the requisite service period be treated as performance conditions. The effective date for ASU 2014-12 is for interim and annual periods beginning after December 15, 2015. The amendments in ASU 2014-12 may be applied either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented and all modified awards thereafter. The adoption of ASU 2014-12 will not affect us, as we are currently recording expense consistent with the requirements of this accounting update. In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (“ASU 2014-15”). ASU 2014-15 is intended to define management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and provide related footnote disclosures. ASU 2014-15 is effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016. Early application is permitted. As the requirements of this literature are disclosure only, ASU 2014-15 will not impact our financial condition or results of operations. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis (“ASU 2015-02”). ASU 2015-02 affects the following areas: (i) limited partnerships and similar legal entities; (ii) the evaluation of fees paid to a decision maker or a service provider as a variable interest; (iii) the effect of fee arrangements on the primary beneficiary determination; (iv) the effect of related parties on the primary beneficiary determination; and (v) certain investment funds. ASU 2015-02 is effective for interim and annual reporting periods beginning after December 15, 2015. The amendments in ASU 2015-02 may be applied either retrospectively or by applying a modified retrospective approach, which would include recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption. While we are currently evaluating ASU 2015-02, we do not expect a material impact on our financial condition or results of operations from the adoption of this guidance. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”). ASU 2015-03 requires debt issuance costs to be netted against the related debt liability in the balance sheet rather than presented as a separate asset. However, ASU 2015-03 does not address the presentation or subsequent measurement of debt issuance costs related to line-of-credit arrangements. Therefore, in August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (“ASU 2015-15”). ASU 2015-15 clarifies that, in the absence of authoritative guidance on line-of-credit arrangements within ASU 2015-03, the SEC would not object to the deferral and presentation of debt issuance costs as an asset and the subsequent amortization of the deferred costs over the term of the line-of-credit arrangement. ASU 2015-03 is effective for interim and annual reporting periods beginning after December 15, 2015, with early adoption permitted, and should be applied on a retrospective basis. As the requirement of ASU 2015-03 is disclosure only, the adoption of this guidance will not impact our financial condition or results of operations. ASU 2015-15 is effective upon adoption of ASU 2015-03. While we are currently evaluating ASU 2015-15, we do not expect a material impact on our financial condition or results of operations from the adoption of this guidance. In April 2015, the FASB issued ASU 2015-05, Customer's Accounting for Fees Paid in a Cloud Computing Arrangement (“ASU 2015-05”). ASU 2015-05 provides guidance to customers with cloud computing arrangements that include a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. The amendments in ASU 2015-05 can be adopted either prospectively, to all arrangements entered into or materially modified after the effective date, or retrospectively. While we are currently evaluating ASU 2015-05, we do not expect a material impact on our financial condition or results of operations from the adoption of this guidance. In May 2015, the FASB issued ASU 2015-07, Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (“ASU 2015-07”). ASU 2015-07 provides guidance that investments for which the practical expedient is used to measure fair value at net asset value per share ("NAV") must be removed from the fair value hierarchy. Instead, those investments must be included as a reconciling line item so that the total fair value amount of investments in the disclosure is consistent with the amount on the balance sheet. ASU 2015-07 also includes disclosure requirements for investments for which the NAV practical expedient was used to determine fair value. ASU 2015-07 is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. The amendments in ASU 2015-07 should be applied retrospectively to all periods presented. As the requirements of this literature are disclosure only, the application of this guidance will not impact our financial condition or results of operations. In May 2015, the FASB issued ASU 2015-09, Disclosures about Short-Duration Contracts (“ASU 2015-09”). ASU 2015-09 requires companies that issue short duration contracts to disclose additional information, including: (i) incurred and paid claims development tables; (ii) frequency and severity of claims; and (iii) information about material changes in judgments made in calculating the liability for unpaid claim adjustment expenses, including reasons for the change and the effects on the financial statements. ASU 2015-09 is effective for annual periods beginning after December 15, 2015, and interim periods within annual periods beginning after December 15, 2016. The amendments in ASU 2015-09 should be applied retrospectively by providing comparative disclosures for each period presented, except for those requirements that apply only to the current period. As the requirements of this literature are disclosure only, the application of this guidance will not impact our financial condition or results of operations.

Statements of Cash Flow

Statements of Cash Flow	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Information [Abstract]
Statements of Cash Flow	Statements of Cash Flow Supplemental cash flow information is as follows: Nine Months ended September 30, ($ in thousands) 2015 2014 Cash paid during the period for: Interest $ 13,843 14,089 Federal income tax 18,500 4,699 Non-cash items: Tax-free exchange of fixed income securities, available-for-sale ("AFS") 35,425 14,954 Tax-free exchange of fixed income securities, held-to-maturity ("HTM") 10,045 4,288 Corporate actions related to equity securities, AFS 1 4,239 334 Assets acquired under capital lease arrangements 6,933 4,853 1 Examples of such corporate actions include non-cash acquisitions and stock splits. Included in "Other assets" on the Consolidated Balance Sheet was $9.9 million at September 30, 2015 and $8.1 million at September 30, 2014 of cash received from the National Flood Insurance Program ("NFIP"), which is restricted to pay flood claims under the Write Your Own ("WYO") program.

Investments

Investments	9 Months Ended
	Sep. 30, 2015
Investments [Abstract]
Investments	Investments (a) The amortized cost, net unrealized gains and losses, carrying value, unrecognized holding gains and losses, and fair value of HTM fixed income securities as of September 30, 2015 and December 31, 2014 were as follows: September 30, 2015 ($ in thousands) Amortized Cost Net Unrealized Gains (Losses) Carrying Value Unrecognized Holding Gains Unrecognized Holding Losses Fair Value Obligations of states and political subdivisions $ 205,443 1,108 206,551 7,423 — 213,974 Corporate securities 18,147 (241 ) 17,906 2,467 — 20,373 Asset-backed securities (“ABS”) 1,209 (157 ) 1,052 158 — 1,210 Commercial mortgage-backed securities (“CMBS”) 4,656 (296 ) 4,360 471 — 4,831 Total HTM fixed income securities $ 229,455 414 229,869 10,519 — 240,388 December 31, 2014 ($ in thousands) Amortized Cost Net Unrealized Gains (Losses) Carrying Value Unrecognized Holding Gains Unrecognized Holding Losses Fair Value Foreign government $ 5,292 47 5,339 55 — 5,394 Obligations of states and political subdivisions 285,301 2,071 287,372 11,760 — 299,132 Corporate securities 18,899 (273 ) 18,626 2,796 — 21,422 ABS 2,818 (455 ) 2,363 460 — 2,823 CMBS 4,869 (432 ) 4,437 753 — 5,190 Total HTM fixed income securities $ 317,179 958 318,137 15,824 — 333,961 Unrecognized holding gains and losses of HTM securities are not reflected in the Financial Statements, as they represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an other-than-temporary impairment (“OTTI”) charge is recognized on an HTM security, through the date of the balance sheet. Our HTM securities had an average duration of 1.5 years as of September 30, 2015 . (b) The cost/amortized cost, unrealized gains and losses, and fair value of AFS securities as of September 30, 2015 and December 31, 2014 were as follows: September 30, 2015 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 109,062 6,069 (1 ) 115,130 Foreign government 19,030 657 — 19,687 Obligations of states and political subdivisions 1,303,188 35,552 (545 ) 1,338,195 Corporate securities 1,859,834 35,222 (8,882 ) 1,886,174 ABS 255,716 1,312 (105 ) 256,923 CMBS 1 220,009 2,450 (457 ) 222,002 Residential mortgage-backed securities (“RMBS”) 2 506,932 7,400 (1,397 ) 512,935 Total AFS fixed income securities 4,273,771 88,662 (11,387 ) 4,351,046 AFS equity securities: Common stock 208,995 13,542 (12,340 ) 210,197 Preferred stock 11,825 46 (117 ) 11,754 Total AFS equity securities 220,820 13,588 (12,457 ) 221,951 Total AFS securities $ 4,494,591 102,250 (23,844 ) 4,572,997 December 31, 2014 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 116,666 7,592 (128 ) 124,130 Foreign government 27,035 796 — 27,831 Obligations of states and political subdivisions 1,208,776 38,217 (729 ) 1,246,264 Corporate securities 1,763,427 42,188 (5,809 ) 1,799,806 ABS 176,837 760 (373 ) 177,224 CMBS 1 177,932 2,438 (777 ) 179,593 RMBS 2 505,113 8,587 (2,426 ) 511,274 Total AFS fixed income securities 3,975,786 100,578 (10,242 ) 4,066,122 AFS equity securities: Common stock 159,011 32,725 (336 ) 191,400 Total AFS equity securities 159,011 32,725 (336 ) 191,400 Total AFS securities $ 4,134,797 133,303 (10,578 ) 4,257,522 1 CMBS includes government guaranteed agency securities with a fair value of $7.4 million at September 30, 2015 and $13.2 million at December 31, 2014 . 2 RMBS includes government guaranteed agency securities with a fair value of $22.5 million at September 30, 2015 and $32.4 million at December 31, 2014 . Unrealized gains and losses of AFS securities represent fair value fluctuations from the later of: (i) the date a security is designated as AFS; or (ii) the date that an OTTI charge is recognized on an AFS security, through the date of the balance sheet. These unrealized gains and losses are recorded in Accumulated other comprehensive (loss) income ("AOCI") on the Consolidated Balance Sheets. (c) The following tables summarize, for all securities in a net unrealized/unrecognized loss position at September 30, 2015 and December 31, 2014 , the fair value and pre-tax net unrealized/unrecognized loss by asset class and by length of time those securities have been in a net loss position: September 30, 2015 Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Fair Value Unrealized Losses 1 AFS fixed income securities: U.S. government and government agencies $ — — 399 (1 ) Obligations of states and political subdivisions 96,861 (545 ) — — Corporate securities 430,481 (7,187 ) 50,552 (1,695 ) ABS 55,856 (71 ) 12,530 (34 ) CMBS 59,004 (367 ) 15,561 (90 ) RMBS 95,254 (457 ) 65,417 (940 ) Total AFS fixed income securities 737,456 (8,627 ) 144,459 (2,760 ) AFS equity securities: Common stock 133,601 (12,340 ) — — Preferred stock 8,562 (117 ) — — Total AFS equity securities 142,163 (12,457 ) — — Subtotal $ 879,619 (21,084 ) 144,459 (2,760 ) Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Unrecognized Gains 2 Fair Value Unrealized Losses 1 Unrecognized Gains 2 HTM securities: ABS $ — — — 942 (157 ) 153 Subtotal $ — — — 942 (157 ) 153 Total AFS and HTM $ 879,619 (21,084 ) — 145,401 (2,917 ) 153 December 31, 2014 Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Fair Value Unrealized Losses 1 AFS fixed income securities: U.S. government and government agencies $ 7,567 (13 ) 10,866 (115 ) Obligations of states and political subdivisions 47,510 (105 ) 64,018 (624 ) Corporate securities 276,648 (1,734 ) 153,613 (4,075 ) ABS 113,202 (178 ) 15,618 (195 ) CMBS 12,799 (34 ) 59,219 (743 ) RMBS 3,399 (8 ) 138,724 (2,418 ) Total AFS fixed income securities 461,125 (2,072 ) 442,058 (8,170 ) AFS equity securities: Common stock 5,262 (336 ) — — Total AFS equity securities 5,262 (336 ) — — Subtotal $ 466,387 (2,408 ) 442,058 (8,170 ) Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Unrecognized Gains 2 Fair Value Unrealized Losses 1 Unrecognized Gains 2 HTM securities: Obligations of states and political subdivisions $ 196 (3 ) 1 — — — ABS — — — 2,235 (455 ) 439 Subtotal 196 (3 ) 1 2,235 (455 ) 439 Total AFS and HTM $ 466,583 (2,411 ) 1 444,293 (8,625 ) 439 1 Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. In addition, this column includes remaining unrealized gain or loss amounts on securities that were transferred to an HTM designation in the first quarter of 2009 for those securities that are in a net unrealized/unrecognized loss position. 2 Unrecognized gains represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an OTTI charge is recognized on an HTM security. The table below provides our net unrealized/unrecognized loss positions by impairment severity as of September 30, 2015 compared with December 31, 2014 : ($ in thousands) September 30, 2015 December 31, 2014 Number of Issues % of Market/Book Unrealized/ Unrecognized Loss Number of Issues % of Market/Book Unrealized/ Unrecognized Loss 389 80% - 99% $ 21,841 350 80% - 99% $ 10,596 4 60% - 79% 2,007 — 60% - 79% — — 40% - 59% — — 40% - 59% — — 20% - 39% — — 20% - 39% — — 0% - 19% — — 0% - 19% — $ 23,848 $ 10,596 We do not intend to sell any of the securities in the tables above, nor do we believe we will be required to sell any of these securities. We have also reviewed these securities under our OTTI policy, as described in Note 2. “Summary of Significant Accounting Policies” within Item 8. “Financial Statements and Supplementary Data.” of our 2014 Annual Report , and have concluded that they are temporarily impaired. This conclusion reflects our current judgment as to the financial position and future prospects of the entity that issued the investment security and underlying collateral. If our judgment about an individual security changes in the future, we may ultimately record a credit loss after having originally concluded that one did not exist, which could have a material impact on our net income and financial position in future periods. (d) Fixed income securities at September 30, 2015 , by contractual maturity, are shown below. Mortgage-backed securities ("MBS") are included in the maturity tables using the estimated average life of each security. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations, with or without call or prepayment penalties. Listed below are the contractual maturities of HTM fixed income securities at September 30, 2015 : ($ in thousands) Carrying Value Fair Value Due in one year or less $ 102,507 103,945 Due after one year through five years 116,833 123,960 Due after five years through 10 years 10,529 12,483 Total HTM fixed income securities $ 229,869 240,388 Listed below are the contractual maturities of AFS fixed income securities at September 30, 2015 : ($ in thousands) Fair Value Due in one year or less $ 501,398 Due after one year through five years 2,180,671 Due after five years through 10 years 1,589,038 Due after 10 years 79,939 Total AFS fixed income securities $ 4,351,046 (e) The following table summarizes our other investment portfolio by strategy and the remaining commitment amount associated with each strategy: Other Investments Carrying Value September 30, 2015 ($ in thousands) September 30, December 31, Remaining Commitment Alternative Investments Secondary private equity $ 17,503 21,807 7,095 Private equity 15,792 20,126 23,826 Energy/power generation 11,643 14,445 16,857 Real estate 8,854 11,452 9,919 Mezzanine financing 6,948 9,853 13,383 Distressed debt 6,889 8,679 3,048 Venture capital 6,539 6,606 150 Total alternative investments 74,168 92,968 74,278 Other securities 10,978 6,235 2,269 Total other investments $ 85,146 99,203 76,547 For a full description of our seven alternative investment strategies, as well as information regarding redemption, restrictions, and fund liquidations, refer to Note 5. “Investments” in Item 8. “Financial Statements and Supplementary Data.” of our 2014 Annual Report . The following table sets forth gross summarized financial information for our other investments portfolio, including the portion not owned by us. The investments are carried under the equity method of accounting. The last line of the table below reflects our share of the aggregate income, which is the portion included in our Financial Statements. As the majority of these investments report results to us on a one quarter lag, the summarized financial statement information for the three and nine-month periods ended June 30 is as follows: Income Statement Information Quarter ended June 30, Nine months ended June 30, ($ in millions) 2015 2014 2015 2014 Net investment income $ 44.1 81.3 $ 139.6 167.0 Realized gains (losses) 385.2 (26.1 ) 977.7 171.5 Net change in unrealized (depreciation) appreciation (222.2 ) 628.6 (1,089.0 ) 1,471.0 Net income $ 207.1 683.8 $ 28.3 1,809.5 Selective’s insurance subsidiaries’ other investments income (loss) $ 1.3 3.9 $ (0.8 ) 12.7 (f) We have pledged certain AFS fixed income securities as collateral related to our: (i) outstanding borrowing of $60 million with the Federal Home Loan Bank of Indianapolis ("FHLBI"); and (ii) reinsurance obligations related to our 2011 acquisition of our excess and surplus lines ("E&S") book of business. In addition, certain securities were on deposit with various state and regulatory agencies to comply with insurance laws. We retain all rights regarding all securities pledged as collateral. The following table summarizes the market value of these securities at September 30, 2015 : ($ in millions) FHLBI Collateral Reinsurance Collateral State and Regulatory Deposits Total U.S. government and government agencies $ 7.7 — 24.4 32.1 Obligations of states and political subdivisions — 5.0 — 5.0 Corporate securities — 4.8 — 4.8 CMBS 1.4 — — 1.4 RMBS 55.5 1.9 — 57.4 Total pledged as collateral $ 64.6 11.7 24.4 100.7 (g) The Company did not have exposure to any credit concentration risk of a single issuer greater than 10% of the Company's stockholders' equity, other than certain U.S. government agencies, as of September 30, 2015 or December 31, 2014 . (h) The components of pre-tax net investment income earned for the periods indicated were as follows: Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Fixed income securities $ 30,601 30,706 $ 92,227 95,515 Equity securities 2,370 1,909 6,546 5,094 Short-term investments 24 15 72 48 Other investments 1,337 3,906 (781 ) 12,677 Investment expenses (2,271 ) (2,244 ) (6,856 ) (6,734 ) Net investment income earned $ 32,061 34,292 $ 91,208 106,600 (i) The following tables summarize OTTI by asset type for the periods indicated. We had no OTTI charges in Third Quarter 2014: Third Quarter 2015 Gross Included in Other Comprehensive Income ("OCI") Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 253 — 253 Total AFS fixed income securities 253 — 253 AFS equity securities: Common stock 1,029 — 1,029 Total AFS equity securities 1,029 — 1,029 Total OTTI losses $ 1,282 — 1,282 Nine Months 2015 Gross Included in OCI Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 1,445 — 1,445 RMBS 1 — 1 Total AFS fixed income securities 1,446 — 1,446 AFS equity securities: Common stock 6,201 — 6,201 Preferred stock 180 — 180 Total AFS equity securities 6,381 — 6,381 Total OTTI losses $ 7,827 — 7,827 Nine Months 2014 Gross Included in OCI Recognized in Earnings ($ in thousands) AFS equity securities: Common stock $ 1,382 — 1,382 Total OTTI losses $ 1,382 — 1,382 For a discussion of our evaluation for OTTI of fixed income securities, short-term investments, equity securities, and other investments, refer to Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2014 Annual Report. The following tables set forth, for the periods indicated, credit loss impairments on fixed income securities for which a portion of the OTTI charge was recognized in OCI, and the corresponding changes in such amounts: Quarter ended September 30, ($ in thousands) 2015 2014 Balance, beginning of period $ 1,013 5,534 Addition for the amount related to credit loss for which an OTTI was not previously recognized — — Reductions for securities sold during the period — (90 ) Reductions for securities for which the amount previously recognized in OCI was recognized in earnings because of intention or potential requirement to sell before recovery of amortized cost — — Additional increases to the amount related to credit loss for which an OTTI was previously recognized — — Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected — — Balance, end of period $ 1,013 5,444 Nine Months ended September 30, ($ in thousands) 2015 2014 Balance, beginning of period $ 5,444 7,488 Addition for the amount related to credit loss for which an OTTI was not previously recognized — — Reductions for securities sold during the period (4,431 ) (2,044 ) Reductions for securities for which the amount previously recognized in OCI was recognized in earnings because of intention or potential requirement to sell before recovery of amortized cost — — Additional increases to the amount related to credit loss for which an OTTI was previously recognized — — Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected — — Balance, end of period $ 1,013 5,444 (j) The components of net realized gains, excluding OTTI charges, for the periods indicated were as follows: Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 HTM fixed income securities Gains $ 3 — 5 3 Losses — (4 ) (1 ) (18 ) AFS fixed income securities Gains 169 695 2,158 1,633 Losses — (29 ) (130 ) (172 ) AFS equity securities Gains 1,419 14,576 23,567 27,255 Losses (1 ) (8 ) (1,347 ) (332 ) Other investments Gains — 1 — 1 Losses — — (654 ) — Total net realized gains (excluding OTTI charges) $ 1,590 15,231 23,598 28,370 Realized gains and losses on the sale of investments are determined on the basis of the cost of the specific investments sold. Proceeds from the sale of AFS securities were $12.7 million and $170.6 million in Third Quarter and Nine Months 2015 , respectively. The $23.6 million in net realized gains for Nine Months 2015 was primarily related to the sale of AFS equity securities due to a change in our dividend equity strategy from a quantitative, model-driven stock selection strategy to a fundamentally-based stock selection approach that incorporates an assessment of the sustainability and growth rate of a company’s dividends and future cash flow. The $15.2 million and $28.4 million in net realized gains in Third Quarter and Nine Months 2014 , respectively, were primarily related to the sale of AFS equity securities due to the quantitative rebalancing of our dividend yield strategy holdings within our equity portfolio.

Indebtedness

Indebtedness	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Indebtedness	NOTE 5. Indebtedness Of our ten insurance subsidiaries ("Insurance Subsidiaries"), we have two domiciled in Indiana ("Indiana Subsidiaries") that are members of the FHLBI. In January 2015, the Indiana Subsidiaries borrowed $15 million in the aggregate from the FHLBI for general corporate purposes. The unpaid principal amount accrues interest of 0.63% , which is paid on the 15th of every month. The principal amount is due on July 22, 2016. For a summary of the Indiana Subsidiaries' borrowings from the FHLBI, refer to Note 10. "Indebtedness" in Item 8. "Financial Statements and Supplementary Data." of our 2014 Annual Report.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following table presents the carrying amounts and estimated fair values of our financial instruments as of September 30, 2015 and December 31, 2014 : September 30, 2015 December 31, 2014 ($ in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial Assets Fixed income securities: HTM $ 229,869 240,388 318,137 333,961 AFS 4,351,046 4,351,046 4,066,122 4,066,122 Equity securities, AFS 221,951 221,951 191,400 191,400 Short-term investments 125,855 125,855 131,972 131,972 Financial Liabilities Notes payable: 0.63% borrowings from FHLBI 15,000 14,995 — — 1.25% borrowings from FHLBI 45,000 45,277 45,000 45,244 7.25% Senior Notes 49,898 57,929 49,896 59,181 6.70% Senior Notes 99,411 112,387 99,401 114,845 5.875% Senior Notes 185,000 187,960 185,000 185,000 Total notes payable $ 394,309 418,548 379,297 404,270 The fair values of our financial assets and liabilities are generated using various valuation techniques and are placed into the fair value hierarchy considering the following: (i) the highest priority is given to quoted prices in active markets for identical assets (Level 1); (ii) the next highest priority is given to quoted prices in markets that are not active or inputs that are observable either directly or indirectly, including quoted prices for similar assets in markets that are not active and other inputs that can be derived principally from, or corroborated by, observable market data for substantially the full term of the assets (Level 2); and (iii) the lowest priority is given to unobservable inputs supported by little or no market activity and that reflect our assumptions about the exit price, including assumptions that market participants would use in pricing the asset (Level 3). An asset or liability's classification within the fair value hierarchy is based on the lowest level of significant input to its valuation. Transfers between levels in the fair value hierarchy are recognized at the end of the reporting period. For a discussion of the techniques used to value our financial assets and liabilities, refer to Note 2. "Summary of Significant Accounting Policies" in Item 8. "Financial Statements and Supplementary Data." of our 2014 Annual Report. The following tables provide quantitative disclosures of our financial assets that were measured at fair value at September 30, 2015 and December 31, 2014 : September 30, 2015 Fair Value Measurements Using ($ in thousands) Assets Measured at Fair Value at 9/30/2015 Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) 1 Significant Other Observable Inputs (Level 2) 1 Significant Unobservable Inputs (Level 3) Description Measured on a recurring basis: AFS fixed income securities: U.S. government and government agencies $ 115,130 51,963 63,167 — Foreign government 19,687 — 19,687 — Obligations of states and political subdivisions 1,338,195 — 1,338,195 — Corporate securities 1,886,174 — 1,886,174 — ABS 256,923 — 256,923 — CMBS 222,002 — 222,002 — RMBS 512,935 — 512,935 — Total AFS fixed income securities 4,351,046 51,963 4,299,083 — AFS equity securities: Common stock 210,197 207,412 — 2,785 Preferred stock 11,754 11,754 — — Total AFS equity securities 221,951 219,166 — 2,785 Total AFS securities 4,572,997 271,129 4,299,083 2,785 Short-term investments 125,855 125,855 — — Total assets measured at fair value $ 4,698,852 396,984 4,299,083 2,785 1 There were no transfers of securities between Level 1 and Level 2. December 31, 2014 Fair Value Measurements Using ($ in thousands) Assets Measured at Fair Value at 12/31/14 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) 1 Significant Other Observable Inputs (Level 2) 1 Significant Unobservable Inputs (Level 3) Description Measured on a recurring basis: AFS fixed income securities: U.S. government and government agencies $ 124,130 53,199 70,931 — Foreign government 27,831 — 27,831 — Obligations of states and political subdivisions 1,246,264 — 1,246,264 — Corporate securities 1,799,806 — 1,799,806 — ABS 177,224 — 177,224 — CMBS 179,593 — 179,593 — RMBS 511,274 — 511,274 — Total AFS fixed income securities 4,066,122 53,199 4,012,923 — AFS equity securities: Common stock 191,400 188,500 — 2,900 Total AFS equity securities 191,400 188,500 — 2,900 Total AFS securities 4,257,522 241,699 4,012,923 2,900 Short-term investments 131,972 131,972 — — Total assets measured at fair value $ 4,389,494 373,671 4,012,923 2,900 1 There were no transfers of securities between Level 1 and Level 2. The following table provides a summary of the changes in the fair value of securities measured using Level 3 inputs and related quantitative information for the nine-month period ended September 30, 2015 . September 30, 2015 Common Stock ($ in thousands) Fair value, December 31, 2014 $ 2,900 Total net (losses) gains for the period included in: OCI — Net income — Purchases — Sales (115 ) Issuances — Settlements — Transfers into Level 3 — Transfers out of Level 3 — Fair value, September 30, 2015 $ 2,785 The $2.9 million in fair value of securities measured using Level 3 prices remained unchanged during the full year 2014 . The price for these securities, which were measured using Level 3 inputs at September 30, 2015 and December 31, 2014 , was obtained through statements provided by the issuer, which we review for reasonableness. The following tables provide quantitative information regarding our financial assets and liabilities that were disclosed at fair value at September 30, 2015 and December 31, 2014 : September 30, 2015 Fair Value Measurements Using ($ in thousands) Assets/ Liabilities Disclosed at Fair Value at 9/30/2015 Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets HTM: Obligations of states and political subdivisions $ 213,974 — 213,974 — Corporate securities 20,373 — 20,373 — ABS 1,210 — 1,210 — CMBS 4,831 — 4,831 — Total HTM fixed income securities $ 240,388 — 240,388 — Financial Liabilities Notes payable: 0.63% borrowings from FHLBI $ 14,995 — 14,995 — 1.25% borrowings from FHLBI 45,277 — 45,277 — 7.25% Senior Notes 57,929 — 57,929 — 6.70% Senior Notes 112,387 — 112,387 — 5.875% Senior Notes 187,960 187,960 — — Total notes payable $ 418,548 187,960 230,588 — December 31, 2014 Fair Value Measurements Using ($ in thousands) Assets/ Liabilities Disclosed at Fair Value at 12/31/2014 Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets HTM: Foreign government $ 5,394 — 5,394 — Obligations of states and political subdivisions 299,132 — 299,132 — Corporate securities 21,422 — 21,422 — ABS 2,823 — 2,823 — CMBS 5,190 — 5,190 — Total HTM fixed income securities $ 333,961 — 333,961 — Financial Liabilities Notes payable: 1.25% borrowings from FHLBI $ 45,244 — 45,244 — 7.25% Senior Notes 59,181 — 59,181 — 6.70% Senior Notes 114,845 — 114,845 — 5.875% Senior Notes 185,000 185,000 — — Total notes payable $ 404,270 185,000 219,270 —

Reinsurance

Reinsurance	9 Months Ended
	Sep. 30, 2015
Reinsurance Disclosures [Abstract]
Reinsurance	Reinsurance The following table contains a listing of direct, assumed, and ceded reinsurance amounts for premiums written, premiums earned, and loss and loss expenses incurred for the periods indicated. For more information concerning reinsurance, refer to Note 8. “Reinsurance” in Item 8. “Financial Statements and Supplementary Data.” of our 2014 Annual Report . Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Premiums written: Direct $ 631,429 592,858 $ 1,851,620 1,723,063 Assumed 6,099 5,780 17,140 19,467 Ceded (92,503 ) (103,517 ) (273,514 ) (290,836 ) Net $ 545,025 495,121 $ 1,595,246 1,451,694 Premiums earned: Direct $ 590,716 548,734 $ 1,728,865 1,630,347 Assumed 5,830 6,789 16,831 27,359 Ceded (89,156 ) (92,884 ) (271,874 ) (274,947 ) Net $ 507,390 462,639 $ 1,473,822 1,382,759 Loss and loss expense incurred: Direct $ 306,635 304,525 $ 935,529 995,581 Assumed 4,224 5,362 13,114 20,218 Ceded (25,698 ) (38,955 ) (86,922 ) (126,526 ) Net $ 285,161 270,932 $ 861,721 889,273 Ceded premiums and losses related to our participation in the NFIP, under which 100% of our flood premiums, losses, and loss expenses are ceded to the NFIP, are as follows: Ceded to NFIP Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Ceded premiums written $ (62,463 ) (69,922 ) $ (178,784 ) (193,000 ) Ceded premiums earned (58,340 ) (60,761 ) (176,119 ) (178,260 ) Ceded loss and loss expense incurred (15,382 ) (14,008 ) (36,315 ) (48,099 )

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information Selective Insurance Group, Inc., through its Insurance Subsidiaries, offers property and casualty insurance products in the standard and E&S marketplaces. We classify our business into four reportable segments, which are as follows: • Standard Commercial Lines - comprised of insurance products and services provided in the standard marketplace to commercial enterprises, which are typically businesses, non-profit organizations, and local government agencies. • Standard Personal Lines - comprised of insurance products and services, including flood insurance coverage, provided primarily to individuals acquiring coverage in the standard marketplace. • E&S Lines - comprised of insurance products and services provided to customers who have not obtained coverage in the standard marketplace. • Investments - invests the premiums collected by our Standard Commercial Lines, Standard Personal Lines, and E&S Lines, as well as our earnings and amounts generated through our capital management strategies, which may include the issuance of debt and equity securities. In the fourth quarter of 2014, we revised our reporting segments from our previously-reported Standard Insurance Operations segment to Standard Commercial Lines and Standard Personal Lines. For information regarding this change, see Note 11. "Segment Information" in Item 8. "Financial Statements and Supplementary Data." of our 2014 Annual Report. In computing the results of each segment, we do not make adjustments for interest expense or net general corporate expenses. While we do not fully allocate taxes to all segments, we do allocate taxes to our Investments segment as we manage that segment on after-tax results. We do not maintain separate investment portfolios for the segments and therefore, do not allocate assets to the segments. In the first quarter of 2014, we sold the renewal rights to our $37 million self-insured group, or "SIG," book of business within the Standard Commercial Lines segment. We decided to opportunistically sell this small and specialized book of pooled business as a significant portion of the business was produced outside of our standard lines footprint, and proved difficult to grow. As this was a renewal rights sale, we continued to service policies that were in force at the date of the sale. We continue to remain active in the municipal and public school marketplace for individual risks that procure traditional insurance programs rather than pooling arrangements. The proceeds from this sale, which amounted to $8 million , are included in "Miscellaneous income" within the table below as a component of Standard Commercial Lines revenue for Nine Months 2014 . The following summaries present revenues (net investment income and net realized gains on investments in the case of the Investments segment) and pre-tax income for the individual segments: Revenue by Segment Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Standard Commercial Lines: Net premiums earned: Commercial automobile $ 90,758 83,536 265,771 249,224 Workers compensation 74,560 66,732 213,991 205,137 General liability 123,252 110,894 357,430 331,303 Commercial property 68,587 61,304 199,699 182,716 Businessowners’ policies 23,726 21,649 69,603 63,797 Bonds 5,031 4,791 15,137 14,281 Other 3,628 3,237 10,649 9,633 Miscellaneous income 448 2,830 4,680 13,315 Total Standard Commercial Lines revenue 389,990 354,973 1,136,960 1,069,406 Standard Personal Lines: Net premiums earned: Personal automobile 36,623 37,695 110,373 113,943 Homeowners 33,670 33,957 101,122 100,831 Other 1,795 2,725 5,143 8,965 Miscellaneous income 250 366 841 1,608 Total Standard Personal Lines revenue 72,338 74,743 217,479 225,347 E&S Lines: Net premiums earned: General liability 32,395 24,659 87,914 70,526 Commercial property 11,309 10,048 31,428 28,544 Commercial automobile 2,056 1,412 5,562 3,859 Total E&S Lines revenue 45,760 36,119 124,904 102,929 Investments: Net investment income 32,061 34,292 91,208 106,600 Net realized investment gains 308 15,231 15,771 26,988 Total Investments revenue 32,369 49,523 106,979 133,588 Total segments revenue 540,457 515,358 1,586,322 1,531,270 Other income — — — 8 Total revenues $ 540,457 515,358 1,586,322 1,531,278 Income Before Federal Income Tax Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Standard Commercial Lines: Underwriting gain $ 44,027 27,771 109,304 39,844 GAAP combined ratio 88.7 % 92.1 90.3 96.2 Statutory combined ratio 88.4 90.9 89.4 95.5 Standard Personal Lines: Underwriting gain (loss) $ 2,826 8,037 (4,295 ) 95 GAAP combined ratio 96.1 % 89.2 102.0 100.0 Statutory combined ratio 95.0 88.9 101.7 99.9 E&S Insurance Operations: Underwriting loss $ (2,022 ) (1,371 ) (5,033 ) (433 ) GAAP combined ratio 104.4 % 103.8 104.0 100.4 Statutory combined ratio 101.1 102.9 101.8 100.3 Investments: Net investment income $ 32,061 34,292 91,208 106,600 Net realized investment gains 308 15,231 15,771 26,988 Total investment income, before federal income tax 32,369 49,523 106,979 133,588 Tax on investment income 7,614 13,858 26,186 36,374 Total investment income, after federal income tax $ 24,755 35,665 80,793 97,214 Reconciliation of Segment Results to Income Before Federal Income Tax Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Underwriting gain (loss), before federal income tax Standard Commercial Lines $ 44,027 27,771 109,304 39,844 Standard Personal Lines 2,826 8,037 (4,295 ) 95 E&S Lines (2,022 ) (1,371 ) (5,033 ) (433 ) Investment income, before federal income tax 32,369 49,523 106,979 133,588 Total all segments 77,200 83,960 206,955 173,094 Interest expense (5,489 ) (5,558 ) (16,458 ) (16,544 ) General corporate and other expenses (5,872 ) (3,076 ) (21,603 ) (16,619 ) Income before federal income tax $ 65,839 75,326 168,894 139,931

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	Retirement Plans The following tables show the net periodic benefit cost related to the Retirement Income Plan for Selective Insurance Company of America (“Retirement Income Plan”) and the life insurance benefits provided to eligible Selective Insurance Company of America retirees (referred to as the "Retirement Life Plan"). The Retirement Income Plan was amended in the first quarter of 2013 to curtail the accrual of additional benefits for all eligible employees after March 31, 2016. For more information concerning these plans, refer to Note 15. “Retirement Plans” in Item 8. “Financial Statements and Supplementary Data.” of our 2014 Annual Report. Retirement Income Plan Retirement Life Plan ($ in thousands) 2015 2014 2015 2014 Components of Net Periodic Benefit Cost: Net Periodic Benefit Cost: Service cost $ 1,964 1,627 $ — — Interest cost 3,501 3,253 64 73 Expected return on plan assets (3,991 ) (3,919 ) — — Amortization of unrecognized net actuarial loss 1,696 367 13 14 Total net periodic cost $ 3,170 1,328 $ 77 87 Retirement Income Plan Retirement Life Plan ($ in thousands) 2015 2014 2015 2014 Components of Net Periodic Benefit Cost: Net Periodic Benefit Cost: Service cost $ 5,891 4,880 $ — — Interest cost 10,504 9,760 190 219 Expected return on plan assets (11,972 ) (11,756 ) — — Amortization of unrecognized net actuarial loss 5,086 1,102 41 40 Total net periodic cost $ 9,509 3,986 $ 231 259 Retirement Income Plan Retirement Life Plan 2015 2014 2015 2014 Weighted-Average Expense Assumptions: Discount rate 4.29 % 5.16 4.08 % 4.85 Expected return on plan assets 6.27 6.92 — — Rate of compensation increase 4.00 4.00 — — We presently anticipate contributing $11.9 million to the Retirement Income Plan in 2015, $9.6 million of which has been funded as of September 30, 2015 .

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Comprehensive Income	Comprehensive Income The components of comprehensive income, both gross and net of tax, for Third Quarter and Nine Months 2015 and 2014 are as follows: Third Quarter 2015 ($ in thousands) Gross Tax Net Net income $ 65,839 18,843 46,996 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during the period 8,371 2,929 5,442 Amounts reclassified into net income: HTM securities (97 ) (34 ) (63 ) Realized gains on AFS securities (305 ) (106 ) (199 ) Net unrealized gains 7,969 2,789 5,180 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,709 599 1,110 Defined benefit pension and post-retirement plans 1,709 599 1,110 Other comprehensive income 9,678 3,388 6,290 Comprehensive income $ 75,517 22,231 53,286 Third Quarter 2014 ($ in thousands) Gross Tax Net Net income $ 75,326 22,164 53,162 Components of OCI: Unrealized losses on investment securities : Unrealized holding losses during the period (13,831 ) (4,843 ) (8,988 ) Amounts reclassified into net income: HTM securities (373 ) (130 ) (243 ) Non-credit OTTI 1,200 420 780 Realized gains on AFS securities (16,435 ) (5,752 ) (10,683 ) Net unrealized losses (29,439 ) (10,305 ) (19,134 ) Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 381 134 247 Defined benefit pension and post-retirement plans 381 134 247 Other comprehensive loss (29,058 ) (10,171 ) (18,887 ) Comprehensive income $ 46,268 11,993 34,275 Nine Months 2015 ($ in thousands) Gross Tax Net Net income $ 168,894 48,422 120,472 Components of OCI: Unrealized losses on investment securities : Unrealized holding losses during the period (27,896 ) (9,764 ) (18,132 ) Amounts reclassified into net income: HTM securities (543 ) (190 ) (353 ) Non-credit OTTI 357 125 232 Realized gains on AFS securities (16,778 ) (5,872 ) (10,906 ) Net unrealized losses (44,860 ) (15,701 ) (29,159 ) Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 5,127 1,795 3,332 Defined benefit pension and post-retirement plans 5,127 1,795 3,332 Other comprehensive loss (39,733 ) (13,906 ) (25,827 ) Comprehensive income $ 129,161 34,516 94,645 Nine Months 2014 ($ in thousands) Gross Tax Net Net income $ 139,931 39,454 100,477 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during the period 64,255 22,488 41,767 Amounts reclassified into net income: HTM securities (1,050 ) (367 ) (683 ) Non-credit OTTI 1,669 584 1,085 Realized gains on AFS securities (28,672 ) (10,035 ) (18,637 ) Net unrealized gains 36,202 12,670 23,532 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,142 400 742 Defined benefit pension and post-retirement plans 1,142 400 742 Other comprehensive income 37,344 13,070 24,274 Comprehensive income $ 177,275 52,524 124,751 The balances of, and changes in, each component of AOCI (net of taxes) as of September 30, 2015 are as follows: September 30, 2015 Net Unrealized (Loss) Gain on Investment Securities Defined Benefit Pension and Post-Retirement Plans Total AOCI ($ in thousands) OTTI Related HTM Related All Other Investments Subtotal Balance, December 31, 2014 $ (514 ) 623 80,284 80,393 (60,605 ) 19,788 OCI before reclassifications — — (18,132 ) (18,132 ) — (18,132 ) Amounts reclassified from AOCI 232 (353 ) (10,906 ) (11,027 ) 3,332 (7,695 ) Net current period OCI 232 (353 ) (29,038 ) (29,159 ) 3,332 (25,827 ) Balance, September 30, 2015 $ (282 ) 270 51,246 51,234 (57,273 ) (6,039 ) The reclassifications out of AOCI are as follows: Quarter ended Nine Months ended ($ in thousands) 2015 2014 2015 2014 Affected Line Item in the Unaudited Consolidated Statement of Income OTTI related Non-credit OTTI on disposed securities $ — 1,200 357 1,669 Net realized gains — 1,200 357 1,669 Income before federal income tax — (420 ) (125 ) (584 ) Total federal income tax expense — 780 232 1,085 Net income HTM related Unrealized losses on HTM disposals 121 12 258 87 Net realized gains Amortization of net unrealized gains on HTM securities (218 ) (385 ) (801 ) (1,137 ) Net investment income earned (97 ) (373 ) (543 ) (1,050 ) Income before federal income tax 34 130 190 367 Total federal income tax expense (63 ) (243 ) (353 ) (683 ) Net income Realized gains on AFS and OTTI Realized gains on AFS disposals and OTTI (305 ) (16,435 ) (16,778 ) (28,672 ) Net realized gains (305 ) (16,435 ) (16,778 ) (28,672 ) Income before federal income tax 106 5,752 5,872 10,035 Total federal income tax expense (199 ) (10,683 ) (10,906 ) (18,637 ) Net income Defined benefit pension and post-retirement life plans Net actuarial loss 371 88 1,114 263 Loss and loss expense incurred 1,338 293 4,013 879 Policy acquisition costs Total defined benefit pension and post-retirement life 1,709 381 5,127 1,142 Income before federal income tax (599 ) (134 ) (1,795 ) (400 ) Total federal income tax expense 1,110 247 3,332 742 Net income Total reclassifications for the period $ 848 (9,899 ) (7,695 ) (17,493 ) Net income

Litigation

Litigation	9 Months Ended
	Sep. 30, 2015
Loss Contingency, Information about Litigation Matters [Abstract]
Litigation	Litigation In the ordinary course of conducting business, we are named as defendants in various legal proceedings. Most of these proceedings are claims litigation involving our Insurance Subsidiaries as either: (i) liability insurers defending or providing indemnity for third-party claims brought against our customers; or (ii) insurers defending first-party coverage claims brought against them. We account for such activity through the establishment of unpaid loss and loss expense reserves. We expect that the ultimate liability, if any, with respect to such ordinary course claims litigation, after consideration of provisions made for potential losses and costs of defense, will not be material to our consolidated financial condition, results of operations, or cash flows. Our Insurance Subsidiaries are also from time to time involved in other legal actions, some of which assert claims for substantial amounts. These actions include, among others, putative class actions seeking certification of a state or national class. Such putative class actions have alleged, for example, improper reimbursement of medical providers paid under workers compensation and personal and commercial automobile insurance policies. Our Insurance Subsidiaries also are involved from time to time in individual actions in which extra-contractual damages, punitive damages, or penalties are sought, such as claims alleging bad faith in the handling of insurance claims. We believe that we have valid defenses to these cases. We expect that the ultimate liability, if any, with respect to such lawsuits, after consideration of provisions made for estimated losses, will not be material to our consolidated financial condition. Nonetheless, given the large or indeterminate amounts sought in certain of these actions, and the inherent unpredictability of litigation, an adverse outcome in certain matters could, from time to time, have a material adverse effect on our consolidated results of operations or cash flows in particular quarterly or annual periods. As of September 30, 2015 , we do not believe the Company was involved in any legal action that could have a material adverse effect on our consolidated financial condition, results of operations, or cash flows.

Subsequent Events (Narrative)

Subsequent Events (Narrative)	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 28, 2015, our Board of Directors declared, for stockholders of record as of November 13, 2015, a $0.15 per share dividend to be paid on December 1, 2015. This is a 7% increase compared with the dividend declared on July 29, 2015.

Statements of Cash Flow (Tables

Statements of Cash Flow (Tables)	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Information [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Nine Months ended September 30, ($ in thousands) 2015 2014 Cash paid during the period for: Interest $ 13,843 14,089 Federal income tax 18,500 4,699 Non-cash items: Tax-free exchange of fixed income securities, available-for-sale ("AFS") 35,425 14,954 Tax-free exchange of fixed income securities, held-to-maturity ("HTM") 10,045 4,288 Corporate actions related to equity securities, AFS 1 4,239 334 Assets acquired under capital lease arrangements 6,933 4,853 1 Examples of such corporate actions include non-cash acquisitions and stock splits.

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2015
Investments [Line Items]
Schedule of Held-to-maturity Securities	September 30, 2015 ($ in thousands) Amortized Cost Net Unrealized Gains (Losses) Carrying Value Unrecognized Holding Gains Unrecognized Holding Losses Fair Value Obligations of states and political subdivisions $ 205,443 1,108 206,551 7,423 — 213,974 Corporate securities 18,147 (241 ) 17,906 2,467 — 20,373 Asset-backed securities (“ABS”) 1,209 (157 ) 1,052 158 — 1,210 Commercial mortgage-backed securities (“CMBS”) 4,656 (296 ) 4,360 471 — 4,831 Total HTM fixed income securities $ 229,455 414 229,869 10,519 — 240,388 December 31, 2014 ($ in thousands) Amortized Cost Net Unrealized Gains (Losses) Carrying Value Unrecognized Holding Gains Unrecognized Holding Losses Fair Value Foreign government $ 5,292 47 5,339 55 — 5,394 Obligations of states and political subdivisions 285,301 2,071 287,372 11,760 — 299,132 Corporate securities 18,899 (273 ) 18,626 2,796 — 21,422 ABS 2,818 (455 ) 2,363 460 — 2,823 CMBS 4,869 (432 ) 4,437 753 — 5,190 Total HTM fixed income securities $ 317,179 958 318,137 15,824 — 333,961
Schedule of Available-for-sale Securities	September 30, 2015 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 109,062 6,069 (1 ) 115,130 Foreign government 19,030 657 — 19,687 Obligations of states and political subdivisions 1,303,188 35,552 (545 ) 1,338,195 Corporate securities 1,859,834 35,222 (8,882 ) 1,886,174 ABS 255,716 1,312 (105 ) 256,923 CMBS 1 220,009 2,450 (457 ) 222,002 Residential mortgage-backed securities (“RMBS”) 2 506,932 7,400 (1,397 ) 512,935 Total AFS fixed income securities 4,273,771 88,662 (11,387 ) 4,351,046 AFS equity securities: Common stock 208,995 13,542 (12,340 ) 210,197 Preferred stock 11,825 46 (117 ) 11,754 Total AFS equity securities 220,820 13,588 (12,457 ) 221,951 Total AFS securities $ 4,494,591 102,250 (23,844 ) 4,572,997 December 31, 2014 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 116,666 7,592 (128 ) 124,130 Foreign government 27,035 796 — 27,831 Obligations of states and political subdivisions 1,208,776 38,217 (729 ) 1,246,264 Corporate securities 1,763,427 42,188 (5,809 ) 1,799,806 ABS 176,837 760 (373 ) 177,224 CMBS 1 177,932 2,438 (777 ) 179,593 RMBS 2 505,113 8,587 (2,426 ) 511,274 Total AFS fixed income securities 3,975,786 100,578 (10,242 ) 4,066,122 AFS equity securities: Common stock 159,011 32,725 (336 ) 191,400 Total AFS equity securities 159,011 32,725 (336 ) 191,400 Total AFS securities $ 4,134,797 133,303 (10,578 ) 4,257,522 1 CMBS includes government guaranteed agency securities with a fair value of $7.4 million at September 30, 2015 and $13.2 million at December 31, 2014 . 2 RMBS includes government guaranteed agency securities with a fair value of $22.5 million at September 30, 2015 and $32.4 million at December 31, 2014 .
Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time	September 30, 2015 Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Fair Value Unrealized Losses 1 AFS fixed income securities: U.S. government and government agencies $ — — 399 (1 ) Obligations of states and political subdivisions 96,861 (545 ) — — Corporate securities 430,481 (7,187 ) 50,552 (1,695 ) ABS 55,856 (71 ) 12,530 (34 ) CMBS 59,004 (367 ) 15,561 (90 ) RMBS 95,254 (457 ) 65,417 (940 ) Total AFS fixed income securities 737,456 (8,627 ) 144,459 (2,760 ) AFS equity securities: Common stock 133,601 (12,340 ) — — Preferred stock 8,562 (117 ) — — Total AFS equity securities 142,163 (12,457 ) — — Subtotal $ 879,619 (21,084 ) 144,459 (2,760 ) Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Unrecognized Gains 2 Fair Value Unrealized Losses 1 Unrecognized Gains 2 HTM securities: ABS $ — — — 942 (157 ) 153 Subtotal $ — — — 942 (157 ) 153 Total AFS and HTM $ 879,619 (21,084 ) — 145,401 (2,917 ) 153 December 31, 2014 Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Fair Value Unrealized Losses 1 AFS fixed income securities: U.S. government and government agencies $ 7,567 (13 ) 10,866 (115 ) Obligations of states and political subdivisions 47,510 (105 ) 64,018 (624 ) Corporate securities 276,648 (1,734 ) 153,613 (4,075 ) ABS 113,202 (178 ) 15,618 (195 ) CMBS 12,799 (34 ) 59,219 (743 ) RMBS 3,399 (8 ) 138,724 (2,418 ) Total AFS fixed income securities 461,125 (2,072 ) 442,058 (8,170 ) AFS equity securities: Common stock 5,262 (336 ) — — Total AFS equity securities 5,262 (336 ) — — Subtotal $ 466,387 (2,408 ) 442,058 (8,170 ) Less than 12 months 12 months or longer ($ in thousands) Fair Value Unrealized Losses 1 Unrecognized Gains 2 Fair Value Unrealized Losses 1 Unrecognized Gains 2 HTM securities: Obligations of states and political subdivisions $ 196 (3 ) 1 — — — ABS — — — 2,235 (455 ) 439 Subtotal 196 (3 ) 1 2,235 (455 ) 439 Total AFS and HTM $ 466,583 (2,411 ) 1 444,293 (8,625 ) 439 1 Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. In addition, this column includes remaining unrealized gain or loss amounts on securities that were transferred to an HTM designation in the first quarter of 2009 for those securities that are in a net unrealized/unrecognized loss position. 2 Unrecognized gains represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an OTTI charge is recognized on an HTM security.
Schedule of The Number Of Securities In An Unrealized Unrecognized Loss Position	($ in thousands) September 30, 2015 December 31, 2014 Number of Issues % of Market/Book Unrealized/ Unrecognized Loss Number of Issues % of Market/Book Unrealized/ Unrecognized Loss 389 80% - 99% $ 21,841 350 80% - 99% $ 10,596 4 60% - 79% 2,007 — 60% - 79% — — 40% - 59% — — 40% - 59% — — 20% - 39% — — 20% - 39% — — 0% - 19% — — 0% - 19% — $ 23,848 $ 10,596 We do not intend to sell any of the securities in the tables above, nor do we believe we will be required to sell any of these securities. We have also reviewed these securities under our OTTI policy, as described in Note 2. “Summary of Significant Accounting Policies” within Item 8. “Financial Statements and Supplementary Data.” of our 2014 Annual Report , and have concluded that they are temporarily impaired. This conclusion reflects our current judgment as to the financial position and future prospects of the entity that issued the investment security and underlying collateral. If our judgment about an individual security changes in the future, we may ultimately record a credit loss after having originally concluded that one did not exist, which could have a material impact on our net income and financial position in future periods.
Schedule of Other Investment Portfolio By Strategy And Remaining Commitment Amount Associated With Each Strategy	Other Investments Carrying Value September 30, 2015 ($ in thousands) September 30, December 31, Remaining Commitment Alternative Investments Secondary private equity $ 17,503 21,807 7,095 Private equity 15,792 20,126 23,826 Energy/power generation 11,643 14,445 16,857 Real estate 8,854 11,452 9,919 Mezzanine financing 6,948 9,853 13,383 Distressed debt 6,889 8,679 3,048 Venture capital 6,539 6,606 150 Total alternative investments 74,168 92,968 74,278 Other securities 10,978 6,235 2,269 Total other investments $ 85,146 99,203 76,547
Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio	Income Statement Information Quarter ended June 30, Nine months ended June 30, ($ in millions) 2015 2014 2015 2014 Net investment income $ 44.1 81.3 $ 139.6 167.0 Realized gains (losses) 385.2 (26.1 ) 977.7 171.5 Net change in unrealized (depreciation) appreciation (222.2 ) 628.6 (1,089.0 ) 1,471.0 Net income $ 207.1 683.8 $ 28.3 1,809.5 Selective’s insurance subsidiaries’ other investments income (loss) $ 1.3 3.9 $ (0.8 ) 12.7
Schedule of Securities Pledged As Collateral	($ in millions) FHLBI Collateral Reinsurance Collateral State and Regulatory Deposits Total U.S. government and government agencies $ 7.7 — 24.4 32.1 Obligations of states and political subdivisions — 5.0 — 5.0 Corporate securities — 4.8 — 4.8 CMBS 1.4 — — 1.4 RMBS 55.5 1.9 — 57.4 Total pledged as collateral $ 64.6 11.7 24.4 100.7
Schedule of Net Investment Income Earned	Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Fixed income securities $ 30,601 30,706 $ 92,227 95,515 Equity securities 2,370 1,909 6,546 5,094 Short-term investments 24 15 72 48 Other investments 1,337 3,906 (781 ) 12,677 Investment expenses (2,271 ) (2,244 ) (6,856 ) (6,734 ) Net investment income earned $ 32,061 34,292 $ 91,208 106,600
Schedule of OTTI By Asset Type	Third Quarter 2015 Gross Included in Other Comprehensive Income ("OCI") Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 253 — 253 Total AFS fixed income securities 253 — 253 AFS equity securities: Common stock 1,029 — 1,029 Total AFS equity securities 1,029 — 1,029 Total OTTI losses $ 1,282 — 1,282 Nine Months 2015 Gross Included in OCI Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 1,445 — 1,445 RMBS 1 — 1 Total AFS fixed income securities 1,446 — 1,446 AFS equity securities: Common stock 6,201 — 6,201 Preferred stock 180 — 180 Total AFS equity securities 6,381 — 6,381 Total OTTI losses $ 7,827 — 7,827 Nine Months 2014 Gross Included in OCI Recognized in Earnings ($ in thousands) AFS equity securities: Common stock $ 1,382 — 1,382 Total OTTI losses $ 1,382 — 1,382
Schedule of Gross Credit Loss Impairments on Fixed Maturity Securities for Which a Portion of the OTTI Charge was Recognized in OCI	Quarter ended September 30, ($ in thousands) 2015 2014 Balance, beginning of period $ 1,013 5,534 Addition for the amount related to credit loss for which an OTTI was not previously recognized — — Reductions for securities sold during the period — (90 ) Reductions for securities for which the amount previously recognized in OCI was recognized in earnings because of intention or potential requirement to sell before recovery of amortized cost — — Additional increases to the amount related to credit loss for which an OTTI was previously recognized — — Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected — — Balance, end of period $ 1,013 5,444 Nine Months ended September 30, ($ in thousands) 2015 2014 Balance, beginning of period $ 5,444 7,488 Addition for the amount related to credit loss for which an OTTI was not previously recognized — — Reductions for securities sold during the period (4,431 ) (2,044 ) Reductions for securities for which the amount previously recognized in OCI was recognized in earnings because of intention or potential requirement to sell before recovery of amortized cost — — Additional increases to the amount related to credit loss for which an OTTI was previously recognized — — Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected — — Balance, end of period $ 1,013 5,444
Schedule of Components of Net Realized Gains Excluding OTTI Charges	Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 HTM fixed income securities Gains $ 3 — 5 3 Losses — (4 ) (1 ) (18 ) AFS fixed income securities Gains 169 695 2,158 1,633 Losses — (29 ) (130 ) (172 ) AFS equity securities Gains 1,419 14,576 23,567 27,255 Losses (1 ) (8 ) (1,347 ) (332 ) Other investments Gains — 1 — 1 Losses — — (654 ) — Total net realized gains (excluding OTTI charges) $ 1,590 15,231 23,598 28,370
Held To Maturity Fixed Income Securities [Member]
Investments [Line Items]
Schedule of Fixed Maturity Securities By Contractual Maturities	($ in thousands) Carrying Value Fair Value Due in one year or less $ 102,507 103,945 Due after one year through five years 116,833 123,960 Due after five years through 10 years 10,529 12,483 Total HTM fixed income securities $ 229,869 240,388
AFS Fixed Income Securities [Member]
Investments [Line Items]
Schedule of Fixed Maturity Securities By Contractual Maturities	($ in thousands) Fair Value Due in one year or less $ 501,398 Due after one year through five years 2,180,671 Due after five years through 10 years 1,589,038 Due after 10 years 79,939 Total AFS fixed income securities $ 4,351,046

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of The Carrying Amounts and Estimated Fair Values of Financial Instruments	September 30, 2015 December 31, 2014 ($ in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial Assets Fixed income securities: HTM $ 229,869 240,388 318,137 333,961 AFS 4,351,046 4,351,046 4,066,122 4,066,122 Equity securities, AFS 221,951 221,951 191,400 191,400 Short-term investments 125,855 125,855 131,972 131,972 Financial Liabilities Notes payable: 0.63% borrowings from FHLBI 15,000 14,995 — — 1.25% borrowings from FHLBI 45,000 45,277 45,000 45,244 7.25% Senior Notes 49,898 57,929 49,896 59,181 6.70% Senior Notes 99,411 112,387 99,401 114,845 5.875% Senior Notes 185,000 187,960 185,000 185,000 Total notes payable $ 394,309 418,548 379,297 404,270
Schedule of Quantitative Disclosures of Our Financial Assets That Were Measured At Fair Value	September 30, 2015 Fair Value Measurements Using ($ in thousands) Assets Measured at Fair Value at 9/30/2015 Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) 1 Significant Other Observable Inputs (Level 2) 1 Significant Unobservable Inputs (Level 3) Description Measured on a recurring basis: AFS fixed income securities: U.S. government and government agencies $ 115,130 51,963 63,167 — Foreign government 19,687 — 19,687 — Obligations of states and political subdivisions 1,338,195 — 1,338,195 — Corporate securities 1,886,174 — 1,886,174 — ABS 256,923 — 256,923 — CMBS 222,002 — 222,002 — RMBS 512,935 — 512,935 — Total AFS fixed income securities 4,351,046 51,963 4,299,083 — AFS equity securities: Common stock 210,197 207,412 — 2,785 Preferred stock 11,754 11,754 — — Total AFS equity securities 221,951 219,166 — 2,785 Total AFS securities 4,572,997 271,129 4,299,083 2,785 Short-term investments 125,855 125,855 — — Total assets measured at fair value $ 4,698,852 396,984 4,299,083 2,785 1 There were no transfers of securities between Level 1 and Level 2. December 31, 2014 Fair Value Measurements Using ($ in thousands) Assets Measured at Fair Value at 12/31/14 Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) 1 Significant Other Observable Inputs (Level 2) 1 Significant Unobservable Inputs (Level 3) Description Measured on a recurring basis: AFS fixed income securities: U.S. government and government agencies $ 124,130 53,199 70,931 — Foreign government 27,831 — 27,831 — Obligations of states and political subdivisions 1,246,264 — 1,246,264 — Corporate securities 1,799,806 — 1,799,806 — ABS 177,224 — 177,224 — CMBS 179,593 — 179,593 — RMBS 511,274 — 511,274 — Total AFS fixed income securities 4,066,122 53,199 4,012,923 — AFS equity securities: Common stock 191,400 188,500 — 2,900 Total AFS equity securities 191,400 188,500 — 2,900 Total AFS securities 4,257,522 241,699 4,012,923 2,900 Short-term investments 131,972 131,972 — — Total assets measured at fair value $ 4,389,494 373,671 4,012,923 2,900 1 There were no transfers of securities between Level 1 and Level 2.
Schedule of Summary of the Changes in Fair Value of Securities Using Level 3 Inputs	September 30, 2015 Common Stock ($ in thousands) Fair value, December 31, 2014 $ 2,900 Total net (losses) gains for the period included in: OCI — Net income — Purchases — Sales (115 ) Issuances — Settlements — Transfers into Level 3 — Transfers out of Level 3 — Fair value, September 30, 2015 $ 2,785
Schedule of Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value	September 30, 2015 Fair Value Measurements Using ($ in thousands) Assets/ Liabilities Disclosed at Fair Value at 9/30/2015 Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets HTM: Obligations of states and political subdivisions $ 213,974 — 213,974 — Corporate securities 20,373 — 20,373 — ABS 1,210 — 1,210 — CMBS 4,831 — 4,831 — Total HTM fixed income securities $ 240,388 — 240,388 — Financial Liabilities Notes payable: 0.63% borrowings from FHLBI $ 14,995 — 14,995 — 1.25% borrowings from FHLBI 45,277 — 45,277 — 7.25% Senior Notes 57,929 — 57,929 — 6.70% Senior Notes 112,387 — 112,387 — 5.875% Senior Notes 187,960 187,960 — — Total notes payable $ 418,548 187,960 230,588 — December 31, 2014 Fair Value Measurements Using ($ in thousands) Assets/ Liabilities Disclosed at Fair Value at 12/31/2014 Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets HTM: Foreign government $ 5,394 — 5,394 — Obligations of states and political subdivisions 299,132 — 299,132 — Corporate securities 21,422 — 21,422 — ABS 2,823 — 2,823 — CMBS 5,190 — 5,190 — Total HTM fixed income securities $ 333,961 — 333,961 — Financial Liabilities Notes payable: 1.25% borrowings from FHLBI $ 45,244 — 45,244 — 7.25% Senior Notes 59,181 — 59,181 — 6.70% Senior Notes 114,845 — 114,845 — 5.875% Senior Notes 185,000 185,000 — — Total notes payable $ 404,270 185,000 219,270 —

Reinsurance (Tables)

Reinsurance (Tables)	9 Months Ended
	Sep. 30, 2015
Reinsurance Disclosures [Abstract]
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts	Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Premiums written: Direct $ 631,429 592,858 $ 1,851,620 1,723,063 Assumed 6,099 5,780 17,140 19,467 Ceded (92,503 ) (103,517 ) (273,514 ) (290,836 ) Net $ 545,025 495,121 $ 1,595,246 1,451,694 Premiums earned: Direct $ 590,716 548,734 $ 1,728,865 1,630,347 Assumed 5,830 6,789 16,831 27,359 Ceded (89,156 ) (92,884 ) (271,874 ) (274,947 ) Net $ 507,390 462,639 $ 1,473,822 1,382,759 Loss and loss expense incurred: Direct $ 306,635 304,525 $ 935,529 995,581 Assumed 4,224 5,362 13,114 20,218 Ceded (25,698 ) (38,955 ) (86,922 ) (126,526 ) Net $ 285,161 270,932 $ 861,721 889,273
Schedule of Ceded Premiums and Losses Related to Flood Operations	Ceded premiums and losses related to our participation in the NFIP, under which 100% of our flood premiums, losses, and loss expenses are ceded to the NFIP, are as follows: Ceded to NFIP Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Ceded premiums written $ (62,463 ) (69,922 ) $ (178,784 ) (193,000 ) Ceded premiums earned (58,340 ) (60,761 ) (176,119 ) (178,260 ) Ceded loss and loss expense incurred (15,382 ) (14,008 ) (36,315 ) (48,099 )

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Schedule of Revenue By Segment	Revenue by Segment Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Standard Commercial Lines: Net premiums earned: Commercial automobile $ 90,758 83,536 265,771 249,224 Workers compensation 74,560 66,732 213,991 205,137 General liability 123,252 110,894 357,430 331,303 Commercial property 68,587 61,304 199,699 182,716 Businessowners’ policies 23,726 21,649 69,603 63,797 Bonds 5,031 4,791 15,137 14,281 Other 3,628 3,237 10,649 9,633 Miscellaneous income 448 2,830 4,680 13,315 Total Standard Commercial Lines revenue 389,990 354,973 1,136,960 1,069,406 Standard Personal Lines: Net premiums earned: Personal automobile 36,623 37,695 110,373 113,943 Homeowners 33,670 33,957 101,122 100,831 Other 1,795 2,725 5,143 8,965 Miscellaneous income 250 366 841 1,608 Total Standard Personal Lines revenue 72,338 74,743 217,479 225,347 E&S Lines: Net premiums earned: General liability 32,395 24,659 87,914 70,526 Commercial property 11,309 10,048 31,428 28,544 Commercial automobile 2,056 1,412 5,562 3,859 Total E&S Lines revenue 45,760 36,119 124,904 102,929 Investments: Net investment income 32,061 34,292 91,208 106,600 Net realized investment gains 308 15,231 15,771 26,988 Total Investments revenue 32,369 49,523 106,979 133,588 Total segments revenue 540,457 515,358 1,586,322 1,531,270 Other income — — — 8 Total revenues $ 540,457 515,358 1,586,322 1,531,278
Schedule of Income Before Federal Income Tax	Income Before Federal Income Tax Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Standard Commercial Lines: Underwriting gain $ 44,027 27,771 109,304 39,844 GAAP combined ratio 88.7 % 92.1 90.3 96.2 Statutory combined ratio 88.4 90.9 89.4 95.5 Standard Personal Lines: Underwriting gain (loss) $ 2,826 8,037 (4,295 ) 95 GAAP combined ratio 96.1 % 89.2 102.0 100.0 Statutory combined ratio 95.0 88.9 101.7 99.9 E&S Insurance Operations: Underwriting loss $ (2,022 ) (1,371 ) (5,033 ) (433 ) GAAP combined ratio 104.4 % 103.8 104.0 100.4 Statutory combined ratio 101.1 102.9 101.8 100.3 Investments: Net investment income $ 32,061 34,292 91,208 106,600 Net realized investment gains 308 15,231 15,771 26,988 Total investment income, before federal income tax 32,369 49,523 106,979 133,588 Tax on investment income 7,614 13,858 26,186 36,374 Total investment income, after federal income tax $ 24,755 35,665 80,793 97,214
Schedule of Reconciliation of Segment Results to Income Before Federal Income Tax	Reconciliation of Segment Results to Income Before Federal Income Tax Quarter ended September 30, Nine Months ended September 30, ($ in thousands) 2015 2014 2015 2014 Underwriting gain (loss), before federal income tax Standard Commercial Lines $ 44,027 27,771 109,304 39,844 Standard Personal Lines 2,826 8,037 (4,295 ) 95 E&S Lines (2,022 ) (1,371 ) (5,033 ) (433 ) Investment income, before federal income tax 32,369 49,523 106,979 133,588 Total all segments 77,200 83,960 206,955 173,094 Interest expense (5,489 ) (5,558 ) (16,458 ) (16,544 ) General corporate and other expenses (5,872 ) (3,076 ) (21,603 ) (16,619 ) Income before federal income tax $ 65,839 75,326 168,894 139,931

Retirement Plans (Table)

Retirement Plans (Table)	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of Components of Net Periodic Benefit Cost	Retirement Income Plan Retirement Life Plan ($ in thousands) 2015 2014 2015 2014 Components of Net Periodic Benefit Cost: Net Periodic Benefit Cost: Service cost $ 1,964 1,627 $ — — Interest cost 3,501 3,253 64 73 Expected return on plan assets (3,991 ) (3,919 ) — — Amortization of unrecognized net actuarial loss 1,696 367 13 14 Total net periodic cost $ 3,170 1,328 $ 77 87 Retirement Income Plan Retirement Life Plan ($ in thousands) 2015 2014 2015 2014 Components of Net Periodic Benefit Cost: Net Periodic Benefit Cost: Service cost $ 5,891 4,880 $ — — Interest cost 10,504 9,760 190 219 Expected return on plan assets (11,972 ) (11,756 ) — — Amortization of unrecognized net actuarial loss 5,086 1,102 41 40 Total net periodic cost $ 9,509 3,986 $ 231 259
Schedule of Weighted-Average Expense Assumptions	Retirement Income Plan Retirement Life Plan 2015 2014 2015 2014 Weighted-Average Expense Assumptions: Discount rate 4.29 % 5.16 4.08 % 4.85 Expected return on plan assets 6.27 6.92 — — Rate of compensation increase 4.00 4.00 — —

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Schedule of Components of Comprehensive Income-Gross and Net of Tax	Third Quarter 2015 ($ in thousands) Gross Tax Net Net income $ 65,839 18,843 46,996 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during the period 8,371 2,929 5,442 Amounts reclassified into net income: HTM securities (97 ) (34 ) (63 ) Realized gains on AFS securities (305 ) (106 ) (199 ) Net unrealized gains 7,969 2,789 5,180 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,709 599 1,110 Defined benefit pension and post-retirement plans 1,709 599 1,110 Other comprehensive income 9,678 3,388 6,290 Comprehensive income $ 75,517 22,231 53,286 Third Quarter 2014 ($ in thousands) Gross Tax Net Net income $ 75,326 22,164 53,162 Components of OCI: Unrealized losses on investment securities : Unrealized holding losses during the period (13,831 ) (4,843 ) (8,988 ) Amounts reclassified into net income: HTM securities (373 ) (130 ) (243 ) Non-credit OTTI 1,200 420 780 Realized gains on AFS securities (16,435 ) (5,752 ) (10,683 ) Net unrealized losses (29,439 ) (10,305 ) (19,134 ) Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 381 134 247 Defined benefit pension and post-retirement plans 381 134 247 Other comprehensive loss (29,058 ) (10,171 ) (18,887 ) Comprehensive income $ 46,268 11,993 34,275 Nine Months 2015 ($ in thousands) Gross Tax Net Net income $ 168,894 48,422 120,472 Components of OCI: Unrealized losses on investment securities : Unrealized holding losses during the period (27,896 ) (9,764 ) (18,132 ) Amounts reclassified into net income: HTM securities (543 ) (190 ) (353 ) Non-credit OTTI 357 125 232 Realized gains on AFS securities (16,778 ) (5,872 ) (10,906 ) Net unrealized losses (44,860 ) (15,701 ) (29,159 ) Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 5,127 1,795 3,332 Defined benefit pension and post-retirement plans 5,127 1,795 3,332 Other comprehensive loss (39,733 ) (13,906 ) (25,827 ) Comprehensive income $ 129,161 34,516 94,645 Nine Months 2014 ($ in thousands) Gross Tax Net Net income $ 139,931 39,454 100,477 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during the period 64,255 22,488 41,767 Amounts reclassified into net income: HTM securities (1,050 ) (367 ) (683 ) Non-credit OTTI 1,669 584 1,085 Realized gains on AFS securities (28,672 ) (10,035 ) (18,637 ) Net unrealized gains 36,202 12,670 23,532 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,142 400 742 Defined benefit pension and post-retirement plans 1,142 400 742 Other comprehensive income 37,344 13,070 24,274 Comprehensive income $ 177,275 52,524 124,751
Schedule of Components of Accumulated Other Comprehensive Income	September 30, 2015 Net Unrealized (Loss) Gain on Investment Securities Defined Benefit Pension and Post-Retirement Plans Total AOCI ($ in thousands) OTTI Related HTM Related All Other Investments Subtotal Balance, December 31, 2014 $ (514 ) 623 80,284 80,393 (60,605 ) 19,788 OCI before reclassifications — — (18,132 ) (18,132 ) — (18,132 ) Amounts reclassified from AOCI 232 (353 ) (10,906 ) (11,027 ) 3,332 (7,695 ) Net current period OCI 232 (353 ) (29,038 ) (29,159 ) 3,332 (25,827 ) Balance, September 30, 2015 $ (282 ) 270 51,246 51,234 (57,273 ) (6,039 )
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income	Quarter ended Nine Months ended ($ in thousands) 2015 2014 2015 2014 Affected Line Item in the Unaudited Consolidated Statement of Income OTTI related Non-credit OTTI on disposed securities $ — 1,200 357 1,669 Net realized gains — 1,200 357 1,669 Income before federal income tax — (420 ) (125 ) (584 ) Total federal income tax expense — 780 232 1,085 Net income HTM related Unrealized losses on HTM disposals 121 12 258 87 Net realized gains Amortization of net unrealized gains on HTM securities (218 ) (385 ) (801 ) (1,137 ) Net investment income earned (97 ) (373 ) (543 ) (1,050 ) Income before federal income tax 34 130 190 367 Total federal income tax expense (63 ) (243 ) (353 ) (683 ) Net income Realized gains on AFS and OTTI Realized gains on AFS disposals and OTTI (305 ) (16,435 ) (16,778 ) (28,672 ) Net realized gains (305 ) (16,435 ) (16,778 ) (28,672 ) Income before federal income tax 106 5,752 5,872 10,035 Total federal income tax expense (199 ) (10,683 ) (10,906 ) (18,637 ) Net income Defined benefit pension and post-retirement life plans Net actuarial loss 371 88 1,114 263 Loss and loss expense incurred 1,338 293 4,013 879 Policy acquisition costs Total defined benefit pension and post-retirement life 1,709 381 5,127 1,142 Income before federal income tax (599 ) (134 ) (1,795 ) (400 ) Total federal income tax expense 1,110 247 3,332 742 Net income Total reclassifications for the period $ 848 (9,899 ) (7,695 ) (17,493 ) Net income

Statements of Cash Flow (Cash F

Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Interest		$ 13,843	$ 14,089
Federal income tax		18,500	4,699
Corporate actions related to equity securities, AFS	[1]	4,239	334
Assets acquired under capital lease arrangements		6,933	4,853
AFS Fixed Maturity Securities [Member]
Tax-free exchange of fixed maturity securities		35,425	14,954
Held-to-maturity Securities [Member]
Tax-free exchange of fixed maturity securities		10,045	4,288
National Flood Insurance Program [Member]
Restricted Cash		$ 9,900	$ 8,100
[1]	1Examples of such corporate actions include non-cash acquisitions and stock splits.

Investments (Held-To-Maturity S

Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 229,455	$ 317,179
Net Unrealized Gains (Losses)	414	958
Carrying Value	229,869	318,137
Unrecognized Holding Gains	10,519	15,824
Unrecognized Holding Losses	0	0
HTM, Fair Value	$ 240,388	333,961
Held-to-maturity Securities Average Duration	1 year 6 months
Foreign Government [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		5,292
Net Unrealized Gains (Losses)		47
Carrying Value		5,339
Unrecognized Holding Gains		55
Unrecognized Holding Losses		0
HTM, Fair Value		5,394
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 205,443	285,301
Net Unrealized Gains (Losses)	1,108	2,071
Carrying Value	206,551	287,372
Unrecognized Holding Gains	7,423	11,760
Unrecognized Holding Losses	0	0
HTM, Fair Value	213,974	299,132
Corporate Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	18,147	18,899
Net Unrealized Gains (Losses)	(241)	(273)
Carrying Value	17,906	18,626
Unrecognized Holding Gains	2,467	2,796
Unrecognized Holding Losses	0	0
HTM, Fair Value	20,373	21,422
Asset-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,209	2,818
Net Unrealized Gains (Losses)	(157)	(455)
Carrying Value	1,052	2,363
Unrecognized Holding Gains	158	460
Unrecognized Holding Losses	0	0
HTM, Fair Value	1,210	2,823
Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,656	4,869
Net Unrealized Gains (Losses)	(296)	(432)
Carrying Value	4,360	4,437
Unrecognized Holding Gains	471	753
Unrecognized Holding Losses	0	0
HTM, Fair Value	$ 4,831	$ 5,190

Investments (Available-For-Sale

Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		$ 4,494,591	$ 4,134,797
Unrealized Gains		102,250	133,303
Unrealized Losses		(23,844)	(10,578)
Total AFS securities		4,572,997	4,257,522
AFS Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		4,273,771	3,975,786
Unrealized Gains		88,662	100,578
Unrealized Losses		(11,387)	(10,242)
Total AFS securities		4,351,046	4,066,122
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		109,062	116,666
Unrealized Gains		6,069	7,592
Unrealized Losses		(1)	(128)
Total AFS securities		115,130	124,130
AFS Fixed Income Securities [Member] | Foreign Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		19,030	27,035
Unrealized Gains		657	796
Unrealized Losses		0	0
Total AFS securities		19,687	27,831
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		1,303,188	1,208,776
Unrealized Gains		35,552	38,217
Unrealized Losses		(545)	(729)
Total AFS securities		1,338,195	1,246,264
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		1,859,834	1,763,427
Unrealized Gains		35,222	42,188
Unrealized Losses		(8,882)	(5,809)
Total AFS securities		1,886,174	1,799,806
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		255,716	176,837
Unrealized Gains		1,312	760
Unrealized Losses		(105)	(373)
Total AFS securities		256,923	177,224
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	[1]	220,009	177,932
Unrealized Gains	[1]	2,450	2,438
Unrealized Losses	[1]	(457)	(777)
Total AFS securities	[1]	222,002	179,593
Government guaranteed agency securities fair value		7,400	13,200
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	[2]	506,932	505,113
Unrealized Gains	[2]	7,400	8,587
Unrealized Losses	[2]	(1,397)	(2,426)
Total AFS securities	[2]	512,935	511,274
Government guaranteed agency securities fair value		22,500	32,400
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		220,820	159,011
Unrealized Gains		13,588	32,725
Unrealized Losses		(12,457)	(336)
Total AFS securities		221,951	191,400
Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		208,995	159,011
Unrealized Gains		13,542	32,725
Unrealized Losses		(12,340)	(336)
Total AFS securities		210,197	$ 191,400
Equity Securities [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost		11,825
Unrealized Gains		46
Unrealized Losses		(117)
Total AFS securities		$ 11,754
[1]	CMBS includes government guaranteed agency securities with a fair value of $7.4 million at September 30, 2015 and $13.2 million at December 31, 2014.
[2]	RMBS includes government guaranteed agency securities with a fair value of $22.5 million at September 30, 2015 and $32.4 million at December 31, 2014.

Investments (Fair Value and Gro

Investments (Fair Value and Gross Pre-Tax Net Unrealized Unrecognized Loss of Securities By Length of Time) (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
AFS Fair Value, Less than 12 months		$ 879,619	$ 466,387
AFS Unrealized Losses, Less than 12 months	[1]	(21,084)	(2,408)
AFS Fair Value, 12 months or longer		144,459	442,058
AFS Unrealized Losses, 12 months or longer	[1]	(2,760)	(8,170)
HTM Fair Value, Less than 12 months		0	196
HTM Unrealized Losses, Less than 12 months	[1]	0	(3)
HTM Unrecognized Gains, Less than 12 months	[2]	0	1
HTM Fair Value, 12 months or longer		942	2,235
HTM Unrealized Losses, 12 months or longer	[1]	(157)	(455)
HTM Unrecognized Gains, 12 months or longer	[2]	153	439
Total AFS and HTM Fair Value, Less than 12 months		879,619	466,583
Total AFS and HTM Unrealized Losses, Less than 12 months	[1]	(21,084)	(2,411)
Total AFS and HTM Securities Unrecognized Gains, Less Than 12 Months	[2]	0	1
Total AFS and HTM Fair Value, 12 months or longer		145,401	444,293
Total AFS and HTM Unrealized Losses, 12 months or longer	[1]	(2,917)	(8,625)
Total AFS and HTM Securities Unrecognized Gains, 12 months or longer	[2]	153	439
Obligations of States and Political Subdivisions [Member]
HTM Fair Value, Less than 12 months			196
HTM Unrealized Losses, Less than 12 months	[1]		(3)
HTM Unrecognized Gains, Less than 12 months	[2]		1
HTM Fair Value, 12 months or longer			0
HTM Unrealized Losses, 12 months or longer	[1]		0
HTM Unrecognized Gains, 12 months or longer	[2]		0
Asset-Backed Securities [Member]
HTM Fair Value, Less than 12 months		0	0
HTM Unrealized Losses, Less than 12 months	[1]	0	0
HTM Unrecognized Gains, Less than 12 months	[2]	0	0
HTM Fair Value, 12 months or longer		942	2,235
HTM Unrealized Losses, 12 months or longer	[1]	(157)	(455)
HTM Unrecognized Gains, 12 months or longer	[2]	153	439
AFS Fixed Income Securities [Member]
AFS Fair Value, Less than 12 months		737,456	461,125
AFS Unrealized Losses, Less than 12 months	[1]	(8,627)	(2,072)
AFS Fair Value, 12 months or longer		144,459	442,058
AFS Unrealized Losses, 12 months or longer	[1]	(2,760)	(8,170)
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
AFS Fair Value, Less than 12 months		0	7,567
AFS Unrealized Losses, Less than 12 months	[1]	0	(13)
AFS Fair Value, 12 months or longer		399	10,866
AFS Unrealized Losses, 12 months or longer	[1]	(1)	(115)
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
AFS Fair Value, Less than 12 months		96,861	47,510
AFS Unrealized Losses, Less than 12 months	[1]	(545)	(105)
AFS Fair Value, 12 months or longer		0	64,018
AFS Unrealized Losses, 12 months or longer	[1]	0	(624)
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
AFS Fair Value, Less than 12 months		430,481	276,648
AFS Unrealized Losses, Less than 12 months	[1]	(7,187)	(1,734)
AFS Fair Value, 12 months or longer		50,552	153,613
AFS Unrealized Losses, 12 months or longer	[1]	(1,695)	(4,075)
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]
AFS Fair Value, Less than 12 months		55,856	113,202
AFS Unrealized Losses, Less than 12 months	[1]	(71)	(178)
AFS Fair Value, 12 months or longer		12,530	15,618
AFS Unrealized Losses, 12 months or longer	[1]	(34)	(195)
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 months		59,004	12,799
AFS Unrealized Losses, Less than 12 months	[1]	(367)	(34)
AFS Fair Value, 12 months or longer		15,561	59,219
AFS Unrealized Losses, 12 months or longer	[1]	(90)	(743)
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 months		95,254	3,399
AFS Unrealized Losses, Less than 12 months	[1]	(457)	(8)
AFS Fair Value, 12 months or longer		65,417	138,724
AFS Unrealized Losses, 12 months or longer	[1]	(940)	(2,418)
Equity Securities [Member]
AFS Fair Value, Less than 12 months		142,163	5,262
AFS Unrealized Losses, Less than 12 months	[1]	(12,457)	(336)
AFS Fair Value, 12 months or longer		0	0
AFS Unrealized Losses, 12 months or longer	[1]	0	0
Common Stock [Member] | Equity Securities [Member]
AFS Fair Value, Less than 12 months		133,601	5,262
AFS Unrealized Losses, Less than 12 months	[1]	(12,340)	(336)
AFS Fair Value, 12 months or longer		0	0
AFS Unrealized Losses, 12 months or longer	[1]	0	$ 0
Preferred Stock [Member] | Equity Securities [Member]
AFS Fair Value, Less than 12 months		8,562
AFS Unrealized Losses, Less than 12 months	[1]	(117)
AFS Fair Value, 12 months or longer		0
AFS Unrealized Losses, 12 months or longer	[1]	$ 0
[1]	Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. In addition, this column includes remaining unrealized gain or loss amounts on securities that were transferred to an HTM designation in the first quarter of 2009 for those securities that are in a net unrealized/unrecognized loss position.
[2]	Unrecognized gains represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an OTTI charge is recognized on an HTM security.

Investments (Number of Securiti

Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) $ in Thousands	Sep. 30, 2015USD ($)Securities	Dec. 31, 2014USD ($)Securities
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
Unrealized Unrecognized Loss	$ 23,848	$ 10,596
Eighty Percent to Ninety-Nine Percent [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
Number Of Securities In An Unrealized/Unrecognized Loss Position | Securities	389	350
Unrealized Unrecognized Loss	$ 21,841	$ 10,596
Sixty Percent to Seventy-Nine Percent [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
Number Of Securities In An Unrealized/Unrecognized Loss Position | Securities	4	0
Unrealized Unrecognized Loss	$ 2,007	$ 0
Forty Percent to Fifty-Nine Percent [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
Number Of Securities In An Unrealized/Unrecognized Loss Position | Securities	0	0
Unrealized Unrecognized Loss	$ 0	$ 0
Twenty Percent to Thirty-Nine Percent [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
Number Of Securities In An Unrealized/Unrecognized Loss Position | Securities	0	0
Unrealized Unrecognized Loss	$ 0	$ 0
Zero Percent to Nineteen Percent [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
Number Of Securities In An Unrealized/Unrecognized Loss Position | Securities	0	0
Unrealized Unrecognized Loss	$ 0	$ 0

Investments (HTM Fixed Income S

Investments (HTM Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less carrying value	$ 102,507
Due after one year through five years carrying value	116,833
Due after five years through 10 years carrying value	10,529
Carrying Value	229,869	$ 318,137
Due in one year or less fair value	103,945
Due after one year through five years fair value	123,960
Due after five years through 10 years fair value	12,483
HTM, Fair Value	$ 240,388	$ 333,961

Investments (AFS Fixed Income s

Investments (AFS Fixed Income securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less fair value	$ 501,398
Due after one year through five years fair value	2,180,671
Due after five years through 10 years fair value	1,589,038
Due after 10 years fair value	79,939
Total AFS fixed income securities	$ 4,351,046	$ 4,066,122

Investments (Other Investment P

Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount Associated With Each Strategy) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Carrying Value	$ 85,146	$ 99,203
Alternative Investments [Member]
Carrying Value	74,168	92,968
Remaining Commitment	74,278
Other Investments [Member]
Carrying Value	85,146	99,203
Remaining Commitment	76,547
Secondary Private Equity [Member] | Alternative Investments [Member]
Carrying Value	17,503	21,807
Remaining Commitment	7,095
Private Equity [Member] | Alternative Investments [Member]
Carrying Value	15,792	20,126
Remaining Commitment	23,826
Energy/Power Generation [Member] | Alternative Investments [Member]
Carrying Value	11,643	14,445
Remaining Commitment	16,857
Real Estate [Member] | Alternative Investments [Member]
Carrying Value	8,854	11,452
Remaining Commitment	9,919
Mezzanine Financing [Member] | Alternative Investments [Member]
Carrying Value	6,948	9,853
Remaining Commitment	13,383
Distressed debt [Member] | Alternative Investments [Member]
Carrying Value	6,889	8,679
Remaining Commitment	3,048
Venture Capital [Member] | Alternative Investments [Member]
Carrying Value	6,539	6,606
Remaining Commitment	150
Other Securities [Member]
Carrying Value	10,978	$ 6,235
Remaining Commitment	$ 2,269

Investments (Aggregated Income

Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Net investment income earned	$ 32,061		$ 34,292		$ 91,208		$ 106,600
Alternative Investments [Member]
Schedule of Equity Method Investments [Line Items]
Net investment income earned	$ 1,300		$ 3,900		$ (800)		$ 12,700
Investments accounted for under the equity method [Member]
Schedule of Equity Method Investments [Line Items]
Net Investment Income		$ 44,100		$ 81,300		$ 139,600		$ 167,000
Realized gains (losses)		385,200		(26,100)		977,700		171,500
Net change in unrealized (depreciation) appreciation		(222,200)		628,600		(1,089,000)		1,471,000
Net income		$ 207,100		$ 683,800		$ 28,300		$ 1,809,500

Investments (Investments Pledge

Investments (Investments Pledged as Collateral) (Details) $ in Millions	Sep. 30, 2015USD ($)
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	$ 64.6
Securities Pledged As Collateral For Reinsurance Obligations	11.7
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	24.4
Securities Pledged As Collateral	100.7
Outstanding Borrowing With The Federal Home Loan Bank Of Indianapolis	60
U.S. Government and Government Agencies [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	7.7
Securities Pledged As Collateral For Reinsurance Obligations	0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	24.4
Securities Pledged As Collateral	32.1
Obligations of States and Political Subdivisions [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	0
Securities Pledged As Collateral For Reinsurance Obligations	5
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0
Securities Pledged As Collateral	5
Corporate Securities [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	0
Securities Pledged As Collateral For Reinsurance Obligations	4.8
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0
Securities Pledged As Collateral	4.8
Commercial Mortgage Backed Securities [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	1.4
Securities Pledged As Collateral For Reinsurance Obligations	0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0
Securities Pledged As Collateral	1.4
Residential Mortgage Backed Securities [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	55.5
Securities Pledged As Collateral For Reinsurance Obligations	1.9
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0
Securities Pledged As Collateral	$ 57.4

Investments (Credit Concentrati

Investments (Credit Concentration Risk) (Details)	Sep. 30, 2015	Dec. 31, 2014
Investments [Abstract]
Maximum exposure to credit concentration risk of the Company's stockholder's equity other than certain U.S. government agencies	10.00%	10.00%

Investments (Net Investment Inc

Investments (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Investment Income [Line Items]
Net investment income earned	$ 32,061	$ 34,292	$ 91,208	$ 106,600
Fixed Income Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	30,601	30,706	92,227	95,515
Equity Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	2,370	1,909	6,546	5,094
Short-Term Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	24	15	72	48
Other Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	1,337	3,906	(781)	12,677
Investment Expenses [Member]
Net Investment Income [Line Items]
Net investment income earned	$ (2,271)	$ (2,244)	$ (6,856)	$ (6,734)

Investments (OTTI by Asset Type

Investments (OTTI by Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
OTTI Losses Gross	$ 1,282	$ 0	$ 7,827	$ 1,382
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0	0
OTTI Losses Recognized in Earnings	1,282		7,827	1,382
Residential Mortgage Backed Securities [Member] | AFS Fixed Income Securities [Member]
OTTI Losses Gross			1
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income			0
OTTI Losses Recognized in Earnings			1
AFS Fixed Income Securities [Member]
OTTI Losses Gross	253		1,446
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	253		1,446
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
OTTI Losses Gross	253		1,445
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	253		1,445
Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross	1,029		6,381
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0
OTTI Losses Recognized in Earnings	1,029		6,381
Common Stock [Member] | Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross	1,029		6,201	1,382
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0		0	0
OTTI Losses Recognized in Earnings	$ 1,029		6,201	$ 1,382
Preferred Stock [Member] | Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross			180
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income			0
OTTI Losses Recognized in Earnings			$ 180

Investments (Gross Credit Loss

Investments (Gross Credit Loss Impairments of Fixed Maturity Securities for Which a Portion of the OTTI Charge was Recognized in OCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments [Abstract]
Balance, beginning of period	$ 1,013	$ 5,534	$ 5,444	$ 7,488
Addition for the amount related to credit loss for which an OTTI was not previously recognized	0	0	0	0
Reductions for securities sold during the period	0	(90)	(4,431)	(2,044)
Reductions for securities for which the amount previously recognized in OCI was recognized in earnings because of intention or potential requirement to sell before recovery of amortized cost	0	0	0	0
Additional increases to the amount related to credit loss for which an OTTI was previously recognized	0	0	0	0
Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected	0	0	0	0
Balance, end of period	$ 1,013	$ 5,444	$ 1,013	$ 5,444

Investments (Components Of Net

Investments (Components Of Net Realized Gains, Excluding OTTI Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
HTM fixed income securities Gains	$ 3	$ 0	$ 5	$ 3
HTM fixed income securities Losses	0	(4)	(1)	(18)
Other investments Gains	0	1	0	1
Other Investments Losses	0	0	(654)	0
Total net realized gains (excluding OTTI charges)	1,590	15,231	23,598	28,370
Proceeds From Sale Of Available For Sale Securities	12,700		170,600
Fixed Income Securities [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
AFS securities Gains	169	695	2,158	1,633
AFS securities Losses	0	(29)	(130)	(172)
Equity Securities [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
AFS securities Gains	1,419	14,576	23,567	27,255
AFS securities Losses	$ (1)	$ (8)	$ (1,347)	$ (332)

Indebtedness (Details)

Indebtedness (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Jan. 31, 2015
Debt Instrument [Line Items]
Number of Insurance Subsidiaries	ten
Indiana Subsidiaries that are members of the FHLBI	two
Outstanding Borrowing With The Federal Home Loan Bank Of Indianapolis	$ 60
Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Debt Instrument [Line Items]
Outstanding Borrowing With The Federal Home Loan Bank Of Indianapolis		$ 15
Unpaid principal amount interest rate	0.63%

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Carrying Amount [Member]
Held-to-maturity Securities	$ 229,869	$ 318,137
Available-for-sale Securities	4,351,046	4,066,122
Equity securities, AFS	221,951	191,400
Short-term investments	125,855	131,972
Notes payable	394,309	379,297
Carrying Amount [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Notes payable	15,000	0
Carrying Amount [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Notes payable	45,000	45,000
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Notes payable	49,898	49,896
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
Notes payable	99,411	99,401
Carrying Amount [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Notes payable	185,000	185,000
Fair Value [Member]
Held-to-maturity Securities	240,388	333,961
Available-for-sale Securities	4,351,046	4,066,122
Equity securities, AFS	221,951	191,400
Short-term investments	125,855	131,972
Notes payable	418,548	404,270
Fair Value [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Notes payable	14,995	0
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Notes payable	45,277	45,244
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Notes payable	57,929	59,181
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
Notes payable	112,387	114,845
Fair Value [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Notes payable	$ 187,960	$ 185,000

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Available-for-sale Securities, Debt Securities		$ 4,351,046	$ 4,066,122
Equity securities, AFS		221,951	191,400
Total AFS securities		4,572,997	4,257,522
Short-term investments		125,855	131,972
Fair Value [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		4,351,046	4,066,122
Equity securities, AFS		221,951	191,400
Total AFS securities		4,572,997	4,257,522
Short-term investments		125,855	131,972
Total assets measured at fair value		4,698,852	4,389,494
Fair Value [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		115,130	124,130
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		19,687	27,831
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		1,338,195	1,246,264
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		1,886,174	1,799,806
Fair Value [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		256,923	177,224
Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		222,002	179,593
Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		512,935	511,274
Fair Value [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		210,197	191,400
Fair Value [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		11,754
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	51,963	53,199
Equity securities, AFS	[1]	219,166	188,500
Total AFS securities	[1]	271,129	241,699
Short-term investments	[1]	125,855	131,972
Total assets measured at fair value	[1]	396,984	373,671
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	51,963	53,199
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	207,412	188,500
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	11,754
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	4,299,083	4,012,923
Equity securities, AFS	[1]	0	0
Total AFS securities	[1]	4,299,083	4,012,923
Short-term investments	[1]	0	0
Total assets measured at fair value	[1]	4,299,083	4,012,923
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	63,167	70,931
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	19,687	27,831
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	1,338,195	1,246,264
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	1,886,174	1,799,806
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	256,923	177,224
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	222,002	179,593
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	512,935	511,274
Significant Other Observable Inputs (Level 2) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	0	0
Significant Other Observable Inputs (Level 2) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Equity securities, AFS		2,785	2,900
Total AFS securities		2,785	2,900
Short-term investments		0	0
Total assets measured at fair value		2,785	2,900
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		2,785	$ 2,900
Significant Unobservable Inputs (Level 3) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		$ 0
[1]	1 There were no transfers of securities between Level 1 and Level 2.

Fair Value Measurements (Change

Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) - Common Stock [Member] - AFS Fixed Maturity Securities [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, December 31, 2014	$ 2,900
Total net (losses) gains for the period included in other comprehensive income	0
Total net (losses) gains for the period included in net income	0
Purchases	0
Sales	(115)
Issuances	0
Settlements	0
Transfers into Level 3	0
Transfers out of Level 3	0
Fair Value, September 30, 2015	$ 2,785

Fair Value Measurements (Quan47

Fair Value Measurements (Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	$ 229,869	$ 318,137
Notes payable	394,309	379,297
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	240,388	333,961
Notes payable	418,548	404,270
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Notes payable	187,960	185,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	240,388	333,961
Notes payable	230,588	219,270
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Notes payable	0	0
Foreign Government [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities		5,394
Foreign Government [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities		0
Foreign Government [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities		5,394
Foreign Government [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities		0
Obligations of States and Political Subdivisions [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	213,974	299,132
Obligations of States and Political Subdivisions [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Obligations of States and Political Subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	213,974	299,132
Obligations of States and Political Subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Corporate Securities [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	20,373	21,422
Corporate Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	20,373	21,422
Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Asset-Backed Securities [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	1,210	2,823
Asset-Backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Asset-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	1,210	2,823
Asset-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Commercial Mortgage Backed Securities [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	4,831	5,190
Commercial Mortgage Backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Commercial Mortgage Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	4,831	5,190
Commercial Mortgage Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity Securities	0	0
Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	14,995
Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0
Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	14,995
Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0
One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	45,277	45,244
One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	45,277	45,244
One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Seven Point Twenty Five Percent Senior Notes [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	57,929	59,181
Seven Point Twenty Five Percent Senior Notes [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Seven Point Twenty Five Percent Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	57,929	59,181
Seven Point Twenty Five Percent Senior Notes [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Six Point Seventy Percent Senior Notes [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	112,387	114,845
Six Point Seventy Percent Senior Notes [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Six Point Seventy Percent Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	112,387	114,845
Six Point Seventy Percent Senior Notes [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Five Point Eight Hundred Seventy Five Senior Notes [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	187,960	185,000
Five Point Eight Hundred Seventy Five Senior Notes [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	187,960	185,000
Five Point Eight Hundred Seventy Five Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Five Point Eight Hundred Seventy Five Senior Notes [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 0	$ 0

Reinsurance (List of Direct, As

Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Premiums written:
Direct	$ 631,429	$ 592,858	$ 1,851,620	$ 1,723,063
Assumed	6,099	5,780	17,140	19,467
Ceded premiums written	(92,503)	(103,517)	(273,514)	(290,836)
Net	545,025	495,121	1,595,246	1,451,694
Premiums earned:
Direct	590,716	548,734	1,728,865	1,630,347
Assumed	5,830	6,789	16,831	27,359
Ceded premiums earned	(89,156)	(92,884)	(271,874)	(274,947)
Net	507,390	462,639	1,473,822	1,382,759
Loss and loss expense incurred:
Direct	306,635	304,525	935,529	995,581
Assumed	4,224	5,362	13,114	20,218
Ceded loss and loss expense incurred	(25,698)	(38,955)	(86,922)	(126,526)
Net	285,161	270,932	861,721	889,273
National Flood Insurance Program [Member]
Premiums written:
Ceded premiums written	(62,463)	(69,922)	(178,784)	(193,000)
Premiums earned:
Ceded premiums earned	(58,340)	(60,761)	(176,119)	(178,260)
Loss and loss expense incurred:
Ceded loss and loss expense incurred	$ (15,382)	$ (14,008)	$ (36,315)	$ (48,099)

Reinsurance (Ceded Premiums and

Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Ceded premiums written	$ (92,503)	$ (103,517)	$ (273,514)	$ (290,836)
Ceded premiums earned	(89,156)	(92,884)	(271,874)	(274,947)
Ceded loss and loss expense incurred	(25,698)	(38,955)	(86,922)	(126,526)
National Flood Insurance Program [Member]
Ceded premiums written	(62,463)	(69,922)	(178,784)	(193,000)
Ceded premiums earned	(58,340)	(60,761)	(176,119)	(178,260)
Ceded loss and loss expense incurred	$ (15,382)	$ (14,008)	$ (36,315)	$ (48,099)
Percentage of NFIP claims ceded by federal government			100.00%

Segment Information Narrative (

Segment Information Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)
Number of Operating Segments		4
Gross premiums of self-insured pooled group renewal book of business sold	$ 37,000
Proceeds from sale of renewal rights		$ 0	$ 8,000

Segment Information (Revenue by

Segment Information (Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total net premiums earned	$ 507,390	$ 462,639	$ 1,473,822	$ 1,382,759
Net investment income earned	32,061	34,292	91,208	106,600
Net realized investment gains	308	15,231	15,771	26,988
Total investment revenues	32,369	49,523	106,979	133,588
Other income	698	3,196	5,521	14,931
Total revenues	540,457	515,358	1,586,322	1,531,278
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	540,457	515,358	1,586,322	1,531,270
Other Income [Member]
Segment Reporting Information [Line Items]
Other income	0	0	0	8
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	389,990	354,973	1,136,960	1,069,406
Standard Commercial Lines [Member] | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	90,758	83,536	265,771	249,224
Standard Commercial Lines [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	74,560	66,732	213,991	205,137
Standard Commercial Lines [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	123,252	110,894	357,430	331,303
Standard Commercial Lines [Member] | Commercial Property [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	68,587	61,304	199,699	182,716
Standard Commercial Lines [Member] | Business Owners' Policies [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	23,726	21,649	69,603	63,797
Standard Commercial Lines [Member] | Bonds Segment [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	5,031	4,791	15,137	14,281
Standard Commercial Lines [Member] | Other Commercial [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	3,628	3,237	10,649	9,633
Standard Commercial Lines [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	448	2,830	4,680	13,315
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	72,338	74,743	217,479	225,347
Standard Personal Lines [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	250	366	841	1,608
Standard Personal Lines [Member] | Personal Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	36,623	37,695	110,373	113,943
Standard Personal Lines [Member] | Homeowners [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	33,670	33,957	101,122	100,831
Standard Personal Lines [Member] | Other Personal [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	1,795	2,725	5,143	8,965
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	45,760	36,119	124,904	102,929
Excess And Surplus Operations [Member] | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	2,056	1,412	5,562	3,859
Excess And Surplus Operations [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	32,395	24,659	87,914	70,526
Excess And Surplus Operations [Member] | Commercial Property [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	$ 11,309	$ 10,048	$ 31,428	$ 28,544

Segment Information (Income Bef

Segment Information (Income Before Federal Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total investment revenues	$ 32,369	$ 49,523	$ 106,979	$ 133,588
Tax on investment income	7,614	13,858	26,186	36,374
Total investment income after federal income tax	24,755	35,665	80,793	97,214
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 44,027	$ 27,771	$ 109,304	$ 39,844
GAAP combined ratio	88.70%	92.10%	90.30%	96.20%
Statutory combined ratio	88.40%	90.90%	89.40%	95.50%
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 2,826	$ 8,037	$ (4,295)	$ 95
GAAP combined ratio	96.10%	89.20%	102.00%	100.00%
Statutory combined ratio	95.00%	88.90%	101.70%	99.90%
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ (2,022)	$ (1,371)	$ (5,033)	$ (433)
GAAP combined ratio	104.40%	103.80%	104.00%	100.40%
Statutory combined ratio	101.10%	102.90%	101.80%	100.30%

Segment Information (Reconcilia

Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Investment income, before federal income tax	$ 32,369	$ 49,523	$ 106,979	$ 133,588
Interest expense	(5,489)	(5,558)	(16,458)	(16,544)
General corporate and other expenses	(5,872)	(3,076)	(21,603)	(16,619)
Income before federal income tax	65,839	75,326	168,894	139,931
Standard Commercial Lines [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss), before federal income tax	44,027	27,771	109,304	39,844
Standard Personal Lines [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss), before federal income tax	2,826	8,037	(4,295)	95
Excess And Surplus Operations [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Underwriting gain (loss), before federal income tax	(2,022)	(1,371)	(5,033)	(433)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total all segments	$ 77,200	$ 83,960	$ 206,955	$ 173,094

Retirement Plans (Components of

Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Retirement Income Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1,964	$ 1,627	$ 5,891	$ 4,880
Interest cost	3,501	3,253	10,504	9,760
Expected return on plan assets	(3,991)	(3,919)	(11,972)	(11,756)
Amortization of unrecognized net actuarial loss	1,696	367	5,086	1,102
Total net periodic cost	3,170	1,328	9,509	3,986
Retirement Life Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0	0
Interest cost	64	73	190	219
Expected return on plan assets	0	0	0	0
Amortization of unrecognized net actuarial loss	13	14	41	40
Total net periodic cost	$ 77	$ 87	$ 231	$ 259

Retirement Plans (Weighted-Aver

Retirement Plans (Weighted-Average Expense Assumptions) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Retirement Income Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.29%	5.16%
Expected return on plan assets	6.27%	6.92%
Rate of compensation increase	4.00%	4.00%
Contributions by Employer	$ 9.6
Retirement Income Plan [Member] | Scenario, Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated contribution from the employer	$ 11.9
Retirement Life Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.08%	4.85%
Expected return on plan assets	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%

Comprehensive Income (Component

Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income, Gross	$ 65,839	$ 75,326	$ 168,894	$ 139,931
Unrealized holding gains (losses) during the period, Gross	8,371	(13,831)	(27,896)	64,255
Amounts reclassified into net income: HTM securities, Gross	(97)	(373)	(543)	(1,050)
Amounts reclassified into net income: Non-credit OTTI, Gross		1,200	357	1,669
Realized gains on AFS securities, Gross	(305)	(16,435)	(16,778)	(28,672)
Net unrealized gains (losses), Gross	7,969	(29,439)	(44,860)	36,202
Amount reclassified into net income: Net actuarial loss, Gross	1,709	381	5,127	1,142
Defined pension and other post-retirement benefit plans, Gross	1,709	381	5,127	1,142
Other comprehensive income (loss), Gross	9,678	(29,058)	(39,733)	37,344
Comprehensive income before tax	75,517	46,268	129,161	177,275
Net income, Tax	18,843	22,164	48,422	39,454
Unrealized holding gains (losses) during the period, Tax	2,929	(4,843)	(9,764)	22,488
Amounts reclassified into net income: HTM securities, Tax	(34)	(130)	(190)	(367)
Amounts reclassified into net income: Non-credit OTTI, Tax		420	125	584
Realized gains on AFS securities, Tax	(106)	(5,752)	(5,872)	(10,035)
Net unrealized gains (losses), Tax	2,789	(10,305)	(15,701)	12,670
Amount reclassified into net income: Net actuarial loss, Tax	599	134	1,795	400
Defined pension and other post-retirement benefit plans, Tax	599	134	1,795	400
Other comprehensive income (loss), Tax	3,388	(10,171)	(13,906)	13,070
Comprehensive income Tax	22,231	11,993	34,516	52,524
Net income	46,996	53,162	120,472	100,477
Unrealized holding gains (losses) arising during period	5,442	(8,988)	(18,132)	41,767
Amounts reclassified into net income: HTM Securities	(63)	(243)	(353)	(683)
Amounts reclassified into net income: Non-credit other-than-temporary impairments on disposed securities	0	780	232	1,085
Realized gains on available-for-sale securities	(199)	(10,683)	(10,906)	(18,637)
Total unrealized gains (losses) on investment securities	5,180	(19,134)	(29,159)	23,532
Amount reclassified into net income: Net actuarial loss	1,110	247	3,332	742
Total defined benefit pension and post-retirement plans	1,110	247	3,332	742
Other comprehensive income (loss)	6,290	(18,887)	(25,827)	24,274
Comprehensive income	$ 53,286	$ 34,275	$ 94,645	$ 124,751

Comprehensive Income (Compone57

Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance,December 31, 2014			$ 19,788
Amounts reclassified into net income: Non-credit other-than-temporary impairments on disposed securities	$ 0	$ 780	232	$ 1,085
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans			0
Amount reclassified into net income: Net actuarial loss	1,110	247	3,332	742
Amounts reclassified from AOCI, HTM Related	(63)	(243)	(353)	(683)
Amounts reclassified from AOCI, All Other	(199)	(10,683)	(10,906)	(18,637)
Other comprehensive (loss) income	6,290	(18,887)	(25,827)	24,274
Other Comprehensive Income, Defined Benefit Pension and Post Retirement Plans, Adjustment, Net of Tax	1,110	$ 247	3,332	742
Ending Balance, September 30, 2015	(6,039)		(6,039)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance,December 31, 2014			80,284
OCI before reclassifications			(18,132)
Other comprehensive (loss) income			(29,038)
Ending Balance, September 30, 2015	51,246		51,246
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance,December 31, 2014			80,393
OCI before reclassifications			(18,132)
Amounts reclassified from AOCI			(11,027)
Other comprehensive (loss) income			(29,159)
Ending Balance, September 30, 2015	51,234		51,234
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance,December 31, 2014			(514)
OCI before reclassifications			0
Other comprehensive (loss) income			232
Ending Balance, September 30, 2015	(282)		(282)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Held-to-maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance,December 31, 2014			623
OCI before reclassifications			0
Other comprehensive (loss) income			(353)
Ending Balance, September 30, 2015	270		270
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance,December 31, 2014			(60,605)
Amount reclassified into net income: Net actuarial loss			3,332
Ending Balance, September 30, 2015	(57,273)		(57,273)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance,December 31, 2014			19,788
OCI before reclassifications			(18,132)
Amounts reclassified from AOCI			(7,695)
Other comprehensive (loss) income			(25,827)	$ 24,274
Ending Balance, September 30, 2015	$ (6,039)		$ (6,039)

Comprehensive Income (Reclassif

Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Amounts reclassified into net income: Non-credit OTTI		$ 1,200	$ 357	$ 1,669
Non-credit OTTI, Tax		(420)	(125)	(584)
Amounts reclassified into net income: Non-credit other-than-temporary impairments on disposed securities	$ 0	780	232	1,085
Reclassification of net unrealized gains on HTM securities including disposals and amortization	(97)	(373)	(543)	(1,050)
Total HTM Related, Tax	34	130	190	367
Amounts reclassified from AOCI, HTM Related	(63)	(243)	(353)	(683)
Realized gains on AFS disposals and OTTI	(305)	(16,435)	(16,778)	(28,672)
Total realized gains on AFS disposals and OTTI	106	5,752	5,872	10,035
Amounts reclassified into net income: realized gains on available for sale securities	(199)	(10,683)	(10,906)	(18,637)
Amount reclassified into net income: Net actuarial loss, Gross	1,709	381	5,127	1,142
Defined pension and other post-retirement benefit plans, Tax	(599)	(134)	(1,795)	(400)
Total defined benefit pension and post-retirement plans	1,110	247	3,332	742
Investment Income [Member]
Amortization of net unrealized gains on HTM securities	(218)	(385)	(801)	(1,137)
Income Before Federal Income Tax [Member]
Amounts reclassified into net income: Non-credit OTTI	0	1,200	357	1,669
Reclassification of net unrealized gains on HTM securities including disposals and amortization	(97)	(373)	(543)	(1,050)
Realized gains on AFS disposals and OTTI	(305)	(16,435)	(16,778)	(28,672)
Amount reclassified into net income: Net actuarial loss, Gross	1,709	381	5,127	1,142
Total Federal Income Tax Expense [Member]
Non-credit OTTI, Tax	0	(420)	(125)	(584)
Total HTM Related, Tax	34	130	190	367
Total realized gains on AFS disposals and OTTI	106	5,752	5,872	10,035
Defined pension and other post-retirement benefit plans, Tax	(599)	(134)	(1,795)	(400)
Net Income Financial Statement Line Item [Member]
Amounts reclassified into net income: Non-credit other-than-temporary impairments on disposed securities	0	780	232	1,085
Amounts reclassified from AOCI, HTM Related	(63)	(243)	(353)	(683)
Amounts reclassified into net income: realized gains on available for sale securities	(199)	(10,683)	(10,906)	(18,637)
Total defined benefit pension and post-retirement plans	1,110	247	3,332	742
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	848	(9,899)	(7,695)	(17,493)
Net Realized Investment Gains [Member]
Unrealized gains and losses on HTM disposals	121	12	258	87
Realized gains on AFS disposals and OTTI	(305)	(16,435)	(16,778)	(28,672)
Net Realized Investment Gains [Member] | Non-credit OTTI on Disposed Securities [Member]
Amounts reclassified into net income: Non-credit OTTI	0	1,200	357	1,669
Loss And Loss Expense Incurred [Member]
Amount reclassified into net income: Net actuarial loss, Gross	371	88	1,114	263
Policy acquisition costs [Member]
Amount reclassified into net income: Net actuarial loss, Gross	$ 1,338	$ 293	$ 4,013	$ 879

Subsequent Events Narrative (De

Subsequent Events Narrative (Details) - $ / shares	Oct. 28, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Subsequent Events [Abstract]
Dividends to stockholders, per share	$ 0.15	$ 0.14	$ 0.13	$ 0.42	$ 0.39
Percentage Increase For Stockholders Dividends Declared	7.00%