Selective Insurance (SIGI) 10-Q 5 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 15, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
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		57,644,481

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Fixed income securities, held-to-maturity – at carrying value (fair value: $171,259 – 2016; $209,544 – 2015)	$ 163,573	$ 201,354
Fixed income securities, available-for-sale – at fair value (amortized cost: $4,484,719 – 2016; $4,352,514 – 2015)	4,600,468	4,408,203
Equity securities, available-for-sale – at fair value (cost: $194,178 – 2016; $193,816 – 2015)	215,789	207,051
Short-term investments (at cost which approximates fair value)	103,132	194,819
Other investments	80,916	77,842
Total investments (Note 4)	5,163,878	5,089,269
Cash	683	898
Interest and dividends due or accrued	37,959	38,501
Premiums receivable, net of allowance for uncollectible accounts of: $4,063 – 2016; $4,422 – 2015	654,344	615,164
Reinsurance recoverables, net of allowance for uncollectible accounts of: $6,000 – 2016; $5,700 – 2015	577,346	561,968
Prepaid reinsurance premiums	137,655	140,889
Deferred federal income tax	67,479	92,696
Property and equipment – at cost, net of accumulated depreciation and amortization of: $192,675 – 2016; $188,548 – 2015	65,164	65,701
Deferred policy acquisition costs	220,948	213,159
Goodwill	7,849	7,849
Other assets	89,187	78,339
Total assets	7,022,492	6,904,433
Liabilities And Stockholders' Equity
Reserve for loss and loss expenses	3,575,496	3,517,728
Unearned premiums	1,209,377	1,169,710
Short-term debt	60,000	60,000
Long-term debt	328,313	328,192
Current federal income tax	11,979	7,442
Accrued salaries and benefits	140,221	167,336
Other liabilities	221,141	255,984
Total liabilities	5,546,527	5,506,392
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: 101,258,870 – 2016; 100,861,372 – 2015	202,518	201,723
Additional paid-in capital	333,965	326,656
Retained earnings	1,474,435	1,446,192
Accumulated other comprehensive income (loss) (Note 10)	35,997	(9,425)
Treasury stock - at cost (shares: 43,622,892 – 2016; 43,500,642 – 2015)	(570,950)	(567,105)
Total stockholders' equity	$ 1,475,965	$ 1,398,041
Commitments and contingencies
Total liabilities and stockholders' equity	$ 7,022,492	$ 6,904,433

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fixed income securities, held-to-maturity, fair value	$ 171,259	$ 209,544
Fixed income securities, available-for-sale, amortized cost	4,484,719	4,352,514
Equity securities, available-for-sale, cost	194,178	193,816
Premiums receivable, allowance for uncollectible accounts	4,063	4,422
Reinsurance recoverable, allowance for uncollectible accounts	6,000	5,700
Property and equipment - at cost, accumulated depreciation and amortization	$ 192,675	$ 188,548
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	101,258,870	100,861,372
Treasury stock - at cost, shares	43,622,892	43,500,642

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Net premiums earned	$ 522,458	$ 476,123
Net investment income earned	30,769	26,917
Net realized (losses) gains:
Net realized investment gains	889	20,977
Other-than-temporary impairments	(3,593)	(2,094)
Total net realized (losses) gains	(2,704)	18,883
Other income	951	1,969
Total revenues	551,474	523,892
Expenses:
Loss and loss expense incurred	297,144	284,999
Policy acquisition costs	183,227	164,723
Interest expense	5,606	5,604
Other expenses	13,622	12,276
Total expenses	499,599	467,602
Income before federal income tax	51,875	56,290
Federal income tax expense:
Current	14,084	12,254
Deferred	759	4,328
Total federal income tax expense	14,843	16,582
Net income	$ 37,032	$ 39,708
Earnings per share:
Basic net income	$ 0.64	$ 0.70
Diluted net income	0.63	0.69
Dividends to stockholders	$ 0.15	$ 0.14

Consolidation Statements of Com

Consolidation Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income	$ 37,032	$ 39,708
Unrealized holding gains arising during period	42,729	15,586
Amount reclassified into net income: Held-to-maturity securities	(47)	(170)
Amount reclassified into net income: Non-credit other-than-temporary impairments	0	232
Amount reclassified into net income: Realized losses (gains) on available-for-sale securities	1,754	(12,932)
Total unrealized gains on investment securities	44,436	2,716
Amount reclassified into net income: Net actuarial loss	986	1,111
Total defined benefit pension and post-retirement plans	986	1,111
Other comprehensive income	45,422	3,827
Comprehensive income	$ 82,454	$ 43,535

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, 2014		$ 199,896	$ 305,385	$ 1,313,440	$ 19,788	$ (562,923)
Dividend reinvestment plan (shares: 10,931 – 2016; 13,533 - 2015)		27	346
Stock purchase and compensation plans (shares: 386,567 - 2016; 469,014 - 2015)		938	7,199
Net income	$ 39,708			39,708
Dividends to stockholders ($0.15 per share - 2016; $0.14 per share - 2015)				(8,113)
Other comprehensive income	3,827				3,827
Acquisition of treasury stock (shares: 122,250 - 2016; 129,257 - 2015)						(3,580)
End of period at Mar. 31, 2015	1,315,938	200,861	312,930	1,345,035	23,615	(566,503)
Beginning of year at Dec. 31, 2015	1,398,041	201,723	326,656	1,446,192	(9,425)	(567,105)
Dividend reinvestment plan (shares: 10,931 – 2016; 13,533 - 2015)		22	351
Stock purchase and compensation plans (shares: 386,567 - 2016; 469,014 - 2015)		773	6,958
Net income	37,032			37,032
Dividends to stockholders ($0.15 per share - 2016; $0.14 per share - 2015)				(8,789)
Other comprehensive income	45,422				45,422
Acquisition of treasury stock (shares: 122,250 - 2016; 129,257 - 2015)						(3,845)
End of period at Mar. 31, 2016	$ 1,475,965	$ 202,518	$ 333,965	$ 1,474,435	$ 35,997	$ (570,950)

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Dividend reinvestment plan, shares	10,931	13,533
Stock purchase and compensation plans, shares	386,567	469,014
Dividends to stockholders, per share	$ 0.15	$ 0.14
Acquisition of treasury stock, shares	122,250	129,257
Preferred stock, par value per share	$ 0	$ 0
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Series A Preferred Stock [Member]
Preferred stock, par value per share	$ 0	$ 0
Preferred stock, shares authorized	300,000	300,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flow - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities
Net income	$ 37,032	$ 39,708
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,627	14,041
Stock-based compensation expense	4,377	3,681
Undistributed losses of equity method investments	1,066	3,541
Net realized gains	2,704	(18,883)
Changes in assets and liabilities:
Increase in reserve for loss and loss expenses, net of reinsurance recoverables	42,390	44,964
Increase in unearned premiums, net of prepaid reinsurance	42,901	41,966
Decrease in net federal income taxes	5,296	11,034
Increase in premiums receivable	(39,180)	(38,110)
Increase in deferred policy acquisition costs	(7,789)	(6,348)
Decrease in interest and dividends due or accrued	528	510
Decrease in accrued salaries and benefits	(27,115)	(16,290)
Increase in other assets	(10,128)	(5,578)
Decrease in other liabilities	(52,902)	(13,662)
Net adjustments	(23,225)	20,866
Net cash provided by operating activities	13,807	60,574
Investing Activities
Purchase of fixed income securities, available-for-sale	(264,828)	(238,000)
Purchase of equity securities, available-for-sale	(7,574)	(150,500)
Purchase of other investments	(12,723)	(1,724)
Purchase of short-term investments	(303,228)	(333,550)
Sale of fixed income securities, available-for-sale	12,905	9,305
Sale of short-term investments	394,915	341,146
Redemption and maturities of fixed income securities, held-to-maturity	37,400	20,720
Redemption and maturities of fixed income securities, available-for-sale	130,641	145,661
Sale of equity securities, available-for-sale	4,285	129,052
Distributions from other investments	7,994	5,845
Purchase of property and equipment	(3,439)	(4,064)
Net cash used in investing activities	(3,652)	(76,109)
Financing Activities
Dividends to stockholders	(8,270)	(7,591)
Acquisition of treasury stock	(3,845)	(3,580)
Net proceeds from stock purchase and compensation plans	1,478	2,271
Proceeds from borrowings	25,000	15,000
Repayments of borrowings	(25,000)	0
Excess tax benefits from share-based payment arrangements	1,361	1,398
Repayments of capital lease obligations	(1,094)	(1,118)
Net cash provided by financing activities	(10,370)	6,380
Net decrease in cash	(215)	(9,155)
Cash, beginning of year	898	23,959
Cash, end of period	$ 683	$ 14,804

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2016
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. Certain amounts in our prior years' Financial Statements and related notes have been reclassified to conform to the 2016 presentation. Such reclassifications had no effect on our net income, stockholders' equity, or cash flows. 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 first quarters ended March 31, 2016 (“ First Quarter 2016 ”) and March 31, 2015 (“ First Quarter 2015 ”) and 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, 2015 (“ 2015 Annual Report ”) filed with the SEC.

Accounting Pronouncements

Accounting Pronouncements	3 Months Ended
	Mar. 31, 2016
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 adoption of ASU 2014-12 in First Quarter 2016 did not affect us, as we record expense consistent with the requirements of this accounting update. 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. We adopted this guidance in First Quarter 2016. Under the new guidance, our limited partnership and tax credit investments are variable interest entities ("VIEs") however we are not the primary beneficiary of any of these investments. As such, the adoption had no impact on our financial condition or results of operations. The required disclosures related to our VIEs are included in Note 4.“Investments” below. 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. We adopted this guidance in First Quarter 2016, with prospective application. The impact of this adoption did not have a material effect on our financial condition or results of operations. 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 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. The adoption of this guidance in First Quarter 2016 did not impact our financial condition or results of operations. Pronouncements to be effective in the future 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 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. ASU 2015-09 is to 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. In January 2016, the FASB issued ASU 2016-01 Financial Instruments - Overall (Sub-topic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 provides guidance to improve certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Specifically the guidance: (i) requires equity investments to be measured at fair value with changes in fair value recognized in earnings; (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (iii) eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost; (iv) requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; and (v) clarifies that the need for a valuation allowance on a deferred tax asset related to an available-for-sale ("AFS") security should be evaluated with other deferred tax assets. ASU 2016-01 is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. Early application to financial statements of annual or interim periods that have not yet been issued are permitted as of the beginning of the year of adoption, otherwise early adoption of ASU 2016-01 is not permitted. We are currently evaluating the impact of this guidance on our financial condition and results of operations. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). ASU 2016-02 requires all lessees to recognize a lease liability and a right-of-use asset, measured at the present value of the future minimum lease payments, at the lease commencement date. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that fiscal year, with early adoption permitted. ASU 2016-02 requires the application of a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. While we are currently evaluating ASU 2016-02, we do not expect a material impact on our financial condition or results of operations from the adoption of this guidance. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-based Payment Accounting (“ASU 2016-09”). ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions including: (i) income tax consequences; (ii) classification of awards as either equity or liabilities; (iii) forfeitures assumptions; and (iv) cash flow classification. ASU 2016-09 is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. While we are currently evaluating ASU 2016-09, we do not expect a material impact on our financial condition or results of operations.

Statements of Cash Flow

Statements of Cash Flow	3 Months Ended
	Mar. 31, 2016
Supplemental Cash Flow Information [Abstract]
Statements of Cash Flow	Statements of Cash Flow Supplemental cash flow information is as follows: Quarter ended March 31, ($ in thousands) 2016 2015 Cash paid during the period for: Interest $ 2,904 2,887 Federal income tax 8,000 4,000 Non-cash items: Exchange of fixed income securities, AFS 9,872 8,586 Corporate actions related to equity securities, AFS 1 — 389 Assets acquired under capital lease arrangements 2,598 2,428 Non-cash purchase of property and equipment 152 — 1 Examples of such corporate actions include non-cash acquisitions and stock splits. Included in "Other assets" on the Consolidated Balance Sheet was $13.5 million at March 31, 2016 and $6.0 million at March 31, 2015 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	3 Months Ended
	Mar. 31, 2016
Investments [Abstract]
Investments	Investments (a) Information regarding our held-to-maturity ("HTM") fixed income securities as of March 31, 2016 and December 31, 2015 was as follows: March 31, 2016 ($ in thousands) Amortized Cost Net Unrealized Gains (Losses) Carrying Value Unrecognized Holding Gains Unrecognized Holding Losses Fair Value Obligations of states and political subdivisions $ 138,203 674 138,877 5,031 — 143,908 Corporate securities 19,829 (180 ) 19,649 2,299 — 21,948 Asset-backed securities (“ABS”) 808 (70 ) 738 67 — 805 Commercial mortgage-backed securities (“CMBS”) 4,506 (197 ) 4,309 289 — 4,598 Total HTM fixed income securities $ 163,346 227 163,573 7,686 — 171,259 December 31, 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 $ 175,269 848 176,117 5,763 — 181,880 Corporate securities 20,228 (185 ) 20,043 1,972 — 22,015 ABS 1,030 (120 ) 910 118 — 1,028 CMBS 4,527 (243 ) 4,284 337 — 4,621 Total HTM fixed income securities $ 201,054 300 201,354 8,190 — 209,544 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 1.6 years as of March 31, 2016 . (b) Information regarding our AFS securities as of March 31, 2016 and December 31, 2015 was as follows: March 31, 2016 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 97,933 4,686 (1 ) 102,618 Foreign government 13,358 384 — 13,742 Obligations of states and political subdivisions 1,375,776 59,673 (134 ) 1,435,315 Corporate securities 1,948,423 45,948 (6,415 ) 1,987,956 ABS 244,924 1,060 (167 ) 245,817 CMBS 249,163 3,938 (209 ) 252,892 Residential mortgage-backed securities (“RMBS”) 555,142 7,851 (865 ) 562,128 Total AFS fixed income securities 4,484,719 123,540 (7,791 ) 4,600,468 AFS equity securities: Common stock 181,396 21,548 (325 ) 202,619 Preferred stock 12,782 388 — 13,170 Total AFS equity securities 194,178 21,936 (325 ) 215,789 Total AFS securities $ 4,678,897 145,476 (8,116 ) 4,816,257 December 31, 2015 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 99,485 4,721 (91 ) 104,115 Foreign government 14,885 298 (2 ) 15,181 Obligations of states and political subdivisions 1,314,779 44,523 (160 ) 1,359,142 Corporate securities 1,892,296 23,407 (15,521 ) 1,900,182 ABS 244,541 531 (918 ) 244,154 CMBS 245,252 750 (2,410 ) 243,592 RMBS 541,276 4,274 (3,713 ) 541,837 Total AFS fixed income securities 4,352,514 78,504 (22,815 ) 4,408,203 AFS equity securities: Common stock 181,991 14,796 (1,998 ) 194,789 Preferred stock 11,825 477 (40 ) 12,262 Total AFS equity securities 193,816 15,273 (2,038 ) 207,051 Total AFS securities $ 4,546,330 93,777 (24,853 ) 4,615,254 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 income (loss) ("AOCI") on the Consolidated Balance Sheets. (c) The following tables provide information regarding our AFS securities in a net unrealized/unrecognized loss position at March 31, 2016 and December 31, 2015 : March 31, 2016 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 $ — — 400 (1 ) Obligations of states and political subdivisions 25,867 (123 ) 820 (11 ) Corporate securities 242,392 (4,315 ) 53,418 (2,100 ) ABS 73,110 (147 ) 5,900 (20 ) CMBS 24,891 (82 ) 27,310 (127 ) RMBS 11,302 (112 ) 91,548 (753 ) Total AFS fixed income securities 377,562 (4,779 ) 179,396 (3,012 ) AFS equity securities: Common stock 5,940 (325 ) — — Total AFS equity securities 5,940 (325 ) — — Total AFS $ 383,502 (5,104 ) 179,396 (3,012 ) December 31, 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 $ 16,006 (87 ) 396 (4 ) Foreign government 1,067 (2 ) — — Obligations of states and political subdivisions 28,617 (160 ) — — Corporate securities 761,479 (12,671 ) 50,382 (2,850 ) ABS 197,477 (807 ) 12,022 (111 ) CMBS 146,944 (2,196 ) 15,385 (214 ) RMBS 264,914 (1,992 ) 63,395 (1,721 ) Total AFS fixed income securities 1,416,504 (17,915 ) 141,580 (4,900 ) AFS equity securities: Common stock 31,148 (1,998 ) — — Preferred stock 1,531 (40 ) — — Total AFS equity securities 32,679 (2,038 ) — — Total AFS $ 1,449,183 (19,953 ) 141,580 (4,900 ) 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. The table below provides our net unrealized/unrecognized loss positions by impairment severity for both AFS and HTM securities as of March 31, 2016 compared with December 31, 2015 : ($ in thousands) March 31, 2016 December 31, 2015 Number of Issues % of Market/Book Unrealized/ Unrecognized Loss Number of Issues % of Market/Book Unrealized/ Unrecognized Loss 252 80% - 99% $ 8,120 606 80% - 99% $ 22,971 — 60% - 79% — 3 60% - 79% 1,888 — 40% - 59% — — 40% - 59% — — 20% - 39% — — 20% - 39% — — 0% - 19% — — 0% - 19% — $ 8,120 $ 24,859 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 2015 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 March 31, 2016 , 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 March 31, 2016 : ($ in thousands) Carrying Value Fair Value Due in one year or less $ 83,751 85,409 Due after one year through five years 66,301 70,301 Due after five years through 10 years 13,521 15,549 Total HTM fixed income securities $ 163,573 171,259 Listed below are the contractual maturities of AFS fixed income securities at March 31, 2016 : ($ in thousands) Fair Value Due in one year or less $ 475,265 Due after one year through five years 2,254,485 Due after five years through 10 years 1,744,928 Due after 10 years 125,790 Total AFS fixed income securities $ 4,600,468 (e) We evaluate the alternative investments and the tax credit investments that are included in our other investments portfolio to determine whether those investments are VIEs and if so, whether consolidation is required. A VIE is an entity that either has equity investors that lack certain essential characteristics of a controlling financial interest or lacks sufficient funds to finance its own activities without financial support provided by other entities. We consider several significant factors in determining if our investments are VIEs and if we are the primary beneficiary including whether we have: (i) the power to direct activities; (ii) the ability to remove the decision maker of the VIE; (iii) the ability to participate in making decisions that are significant to the VIE; and (iv) the obligation to absorb losses and the right to receive benefits that could potentially be significant to the VIE. We have determined that the investments in our other investment portfolio are VIEs, but that we are not the primary beneficiary and therefore, consolidation is not required. The following table summarizes our other investment portfolio by strategy: Other Investments March 31, 2016 December 31, 2015 ($ in thousands) Carrying Value Remaining Commitment Maximum Exposure to Loss 1 Carrying Value Remaining Commitment Maximum Exposure to Loss 1 Alternative Investments Private equity $ 32,478 28,750 61,228 35,088 30,204 65,292 Private credit 21,939 25,129 47,068 13,246 15,129 28,375 Real assets 16,792 28,559 45,351 19,500 25,820 45,320 Total alternative investments 71,209 82,438 153,647 67,834 71,153 138,987 Other securities 9,707 6,850 16,557 10,008 3,200 13,208 Total other investments $ 80,916 89,288 170,204 77,842 74,353 152,195 1 The maximum exposure to loss includes both the carry value of these investments and the related unfunded commitments. In addition, tax credits that have been previously recognized from our investment in Other securities are subject to the risk of recapture, which we do not consider significant. We do not have a future obligation to fund losses or debts on behalf of the investments above; however, we may voluntarily contribute funds. We have not provided any non-contractual financial support at any time during 2016 or 2015. In addition to the strategy descriptions included in Note 5. “Investments” in Item 8. “Financial Statements and Supplementary Data.” of our 2015 Annual Report , our private credit strategy now includes middle market lending, which is a strategy that provides privately negotiated loans to U.S. middle market companies. Typically, these are floating rate, senior secured loans diversified across industries. Loans can be made to private equity sponsor-backed companies or non-sponsored companies to finance leveraged buyouts, recapitalizations, and acquisitions. The following table sets forth gross summarized financial information for our other investments portfolio, including the portion not owned by us. The majority of these investments are carried under the equity method of accounting. The last line of the table below reflects our share of the aggregate loss, 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-month periods ended December 31 is as follows: Income Statement Information Quarter ended December 31, ($ in millions) 2015 2014 Net investment income $ 46.6 77.0 Realized gains 752.5 160.5 Net change in unrealized depreciation (883.2 ) (518.0 ) Net loss $ (84.1 ) (280.5 ) Selective’s insurance subsidiaries’ other investments loss $ (1.1 ) (3.5 ) (f) We have pledged certain AFS fixed income securities as collateral related to our: (i) outstanding borrowing of $60 million with the Federal Home Loan Bank of Indianapolis ("FHLBI"); and (ii) reinsurance obligations related to our 2011 acquisition of our excess and surplus lines ("E&S") book of business. In addition, certain securities were on deposit with various state and regulatory agencies at March 31, 2016 to comply with insurance laws. We retain all rights regarding all securities pledged as collateral. The following table summarizes the market value of these securities at March 31, 2016 : ($ in millions) FHLBI Collateral Reinsurance Collateral State and Regulatory Deposits Total U.S. government and government agencies $ 7.6 — 23.8 31.4 Obligations of states and political subdivisions — 5.0 — 5.0 Corporate securities — 4.8 — 4.8 CMBS 1.1 — — 1.1 RMBS 54.7 1.8 — 56.5 Total pledged as collateral $ 63.4 11.6 23.8 98.8 (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 March 31, 2016 or December 31, 2015 . (h) The components of pre-tax net investment income earned for the periods indicated were as follows: Quarter ended March 31, ($ in thousands) 2016 2015 Fixed income securities $ 31,644 30,967 Equity securities 2,230 1,792 Short-term investments 159 25 Other investments (1,066 ) (3,540 ) Investment expenses (2,198 ) (2,327 ) Net investment income earned $ 30,769 26,917 (i) The following tables summarize OTTI by asset type for the periods indicated: First Quarter 2016 Gross Included in Other Comprehensive Income ("OCI") Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 973 — 973 Total AFS fixed income securities 973 — 973 AFS equity securities: Common stock 2,617 — 2,617 Preferred stock 3 — 3 Total AFS equity securities 2,620 — 2,620 Total OTTI losses $ 3,593 — 3,593 First Quarter 2015 Gross Included in OCI Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 1,009 — 1,009 RMBS 1 — 1 Total AFS fixed income securities 1,010 — 1,010 AFS equity securities: Common stock 1,084 — 1,084 Preferred stock — — — Total AFS equity securities 1,084 — 1,084 Total OTTI losses $ 2,094 — 2,094 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 2015 Annual Report . (j) The components of net realized gains, excluding OTTI charges, for the periods indicated were as follows: Quarter ended March 31, ($ in thousands) 2016 2015 HTM fixed income securities Losses $ (1 ) (1 ) AFS fixed income securities Gains 620 1,502 Losses (36 ) (112 ) AFS equity securities Gains 330 21,318 Losses (20 ) (1,076 ) Other investments Losses (4 ) (654 ) Total net realized gains (excluding OTTI charges) $ 889 20,977 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 $17.2 million and $138.4 million in First Quarter 2016 and First Quarter 2015 , respectively. The $21.0 million in net realized gains for First Quarter 2015 were primarily 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.

Indebtedness

Indebtedness	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Indebtedness	NOTE 5. Indebtedness On February 26, 2016, Selective Insurance Company of America ("SICA") borrowed short-term funds of $25 million from the Federal Home Loan Bank of New York at an interest rate of 0.59% . This borrowing was repaid on March 18, 2016. For additional information on our indebtedness, see Note 10. "Indebtedness" in Item 8. "Financial Statements and Supplementary Data." of our 2015 Annual Report .

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 : March 31, 2016 December 31, 2015 ($ in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial Assets Fixed income securities: HTM $ 163,573 171,259 201,354 209,544 AFS 4,600,468 4,600,468 4,408,203 4,408,203 Equity securities, AFS 215,789 215,789 207,051 207,051 Short-term investments 103,132 103,132 194,819 194,819 Financial Liabilities Short-term debt: 0.63% borrowings from FHLBI $ 15,000 15,014 15,000 14,977 1.25% borrowings from FHLBI 45,000 45,250 45,000 45,083 Total short-term debt $ 60,000 60,264 60,000 60,060 Long-term debt: 7.25% Senior Notes $ 49,899 59,406 49,898 56,929 6.70% Senior Notes 99,419 115,478 99,415 110,363 5.875% Senior Notes 185,000 192,252 185,000 192,474 Subtotal long-term debt 334,318 367,136 334,313 359,766 Unamortized debt issuance costs (6,005 ) (6,121 ) Total long-term debt $ 328,313 328,192 For a discussion of the fair value and hierarchy 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 2015 Annual Report . The following tables provide quantitative disclosures of our financial assets that were measured at fair value at March 31, 2016 and December 31, 2015 : March 31, 2016 Fair Value Measurements Using ($ in thousands) Assets 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 $ 102,618 42,570 60,048 — Foreign government 13,742 — 13,742 — Obligations of states and political subdivisions 1,435,315 — 1,435,315 — Corporate securities 1,987,956 — 1,987,956 — ABS 245,817 — 245,817 — CMBS 252,892 — 252,892 — RMBS 562,128 — 562,128 — Total AFS fixed income securities 4,600,468 42,570 4,557,898 — AFS equity securities: Common stock 202,619 199,347 — 3,272 Preferred stock 13,170 13,170 — — Total AFS equity securities 215,789 212,517 — 3,272 Total AFS securities 4,816,257 255,087 4,557,898 3,272 Short-term investments 103,132 103,132 — — Total assets measured at fair value $ 4,919,389 358,219 4,557,898 3,272 December 31, 2015 Fair Value Measurements Using ($ in thousands) Assets 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 $ 104,115 42,702 61,413 — Foreign government 15,181 — 15,181 — Obligations of states and political subdivisions 1,359,142 — 1,359,142 — Corporate securities 1,900,182 — 1,900,182 — ABS 244,154 — 244,154 — CMBS 243,592 — 243,592 — RMBS 541,837 — 541,837 — Total AFS fixed income securities 4,408,203 42,702 4,365,501 — AFS equity securities: Common stock 194,789 191,517 — 3,272 Preferred stock 12,262 12,262 — — Total AFS equity securities 207,051 203,779 — 3,272 Total AFS securities 4,615,254 246,481 4,365,501 3,272 Short-term investments 194,819 194,819 — — Total assets measured at fair value $ 4,810,073 441,300 4,365,501 3,272 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 quarter ended March 31, 2016 : March 31, 2016 Common Stock ($ in thousands) Fair value, December 31, 2015 $ 3,272 Total net (losses) gains for the period included in: OCI — Net income — Purchases 1,126 Sales (1,126 ) Issuances — Settlements — Transfers into Level 3 — Transfers out of Level 3 — Fair value, March 31, 2016 $ 3,272 The following tables provide quantitative information regarding our financial assets and liabilities that were disclosed at fair value at March 31, 2016 and December 31, 2015 : March 31, 2016 Fair Value Measurements Using ($ in thousands) Assets/ 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 $ 143,908 — 143,908 — Corporate securities 21,948 — 18,467 3,481 ABS 805 — 805 — CMBS 4,598 — 4,598 — Total HTM fixed income securities $ 171,259 — 167,778 3,481 Financial Liabilities Short-term debt: 0.63% borrowings from FHLBI $ 15,014 — 15,014 — 1.25% borrowings from FHLBI 45,250 — 45,250 — Total short-term debt $ 60,264 — 60,264 — Long-term debt: 7.25% Senior Notes $ 59,406 — 59,406 — 6.70% Senior Notes 115,478 — 115,478 — 5.875% Senior Notes 192,252 192,252 — — Total long-term debt $ 367,136 192,252 174,884 — December 31, 2015 Fair Value Measurements Using ($ in thousands) Assets/ 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 $ 181,880 — 181,880 — Corporate securities 22,015 — 18,679 3,336 ABS 1,028 — 1,028 — CMBS 4,621 — 4,621 — Total HTM fixed income securities $ 209,544 — 206,208 3,336 Financial Liabilities Short-term debt: 0.63% borrowings from FHLBI $ 14,977 — 14,977 — 1.25% borrowings from FHLBI 45,083 — 45,083 — Total short-term debt $ 60,060 — 60,060 — Long-term debt: 7.25% Senior Notes $ 56,929 — 56,929 — 6.70% Senior Notes 110,363 — 110,363 — 5.875% Senior Notes 192,474 192,474 — — Total long-term debt $ 359,766 192,474 167,292 —

Reinsurance

Reinsurance	3 Months Ended
	Mar. 31, 2016
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 2015 Annual Report . Quarter ended March 31, ($ in thousands) 2016 2015 Premiums written: Direct $ 646,278 598,783 Assumed 6,320 6,081 Ceded (87,239 ) (86,776 ) Net $ 565,359 518,088 Premiums earned: Direct $ 606,661 562,042 Assumed 6,270 5,908 Ceded (90,473 ) (91,827 ) Net $ 522,458 476,123 Loss and loss expense incurred: Direct $ 361,639 312,246 Assumed 6,355 4,662 Ceded (70,850 ) (31,909 ) Net $ 297,144 284,999 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 March 31, ($ in thousands) 2016 2015 Ceded premiums written $ (53,248 ) (53,842 ) Ceded premiums earned (56,814 ) (58,998 ) Ceded loss and loss expense incurred (40,718 ) (6,249 )

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information 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 insurance operations, as well as our earnings and amounts generated through our capital management strategies, which may include the issuance of debt and equity securities. 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. 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 March 31, ($ in thousands) 2016 2015 Standard Commercial Lines: Net premiums earned: Commercial automobile $ 95,419 86,355 Workers compensation 76,000 68,477 General liability 128,085 114,971 Commercial property 70,178 64,563 Businessowners’ policies 23,904 22,699 Bonds 5,464 5,000 Other 3,839 3,468 Miscellaneous income 690 1,669 Total Standard Commercial Lines revenue 403,579 367,202 Standard Personal Lines: Net premiums earned: Personal automobile 35,780 37,010 Homeowners 32,900 33,721 Other 1,525 1,748 Miscellaneous income 260 300 Total Standard Personal Lines revenue 70,465 72,779 E&S Lines: Net premiums earned: General liability 35,522 26,726 Commercial property 11,444 9,655 Commercial automobile 2,398 1,730 Miscellaneous income 1 — Total E&S Lines revenue 49,365 38,111 Investments: Net investment income 30,769 26,917 Net realized investment (losses) gains (2,704 ) 18,883 Total Investments revenue 28,065 45,800 Total revenues $ 551,474 523,892 Income Before Federal Income Tax Quarter ended March 31, ($ in thousands) 2016 2015 Standard Commercial Lines: Underwriting gain $ 30,932 30,036 GAAP combined ratio 92.3 % 91.8 Statutory combined ratio 89.7 89.7 Standard Personal Lines: Underwriting gain (loss) $ 8,605 (2,466 ) GAAP combined ratio 87.7 % 103.4 Statutory combined ratio 90.6 105.1 E&S Insurance Operations: Underwriting gain (loss) $ 1,418 (1,549 ) GAAP combined ratio 97.1 % 104.1 Statutory combined ratio 98.4 102.1 Investments: Net investment income $ 30,769 26,917 Net realized investment (losses) gains (2,704 ) 18,883 Total investment income, before federal income tax 28,065 45,800 Tax on investment income 6,263 12,318 Total investment income, after federal income tax $ 21,802 33,482 Reconciliation of Segment Results to Income Before Federal Income Tax Quarter ended March 31, ($ in thousands) 2016 2015 Underwriting gain, before federal income tax Standard Commercial Lines $ 30,932 30,036 Standard Personal Lines 8,605 (2,466 ) E&S Lines 1,418 (1,549 ) Investment income, before federal income tax 28,065 45,800 Total all segments 69,020 71,821 Interest expense (5,606 ) (5,604 ) General corporate and other expenses (11,539 ) (9,927 ) Income before federal income tax $ 51,875 56,290

Retirement Plans

Retirement Plans	3 Months Ended
	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	Retirement Plans SICA's primary pension plan is the Retirement Income Plan for Selective Insurance Company of America (the “Pension Plan”). SICA also sponsors the Supplemental Excess Retirement Plan (the “Excess Plan”) and a life insurance benefit plan. All plans are closed to new entrants and benefits ceased accruing under the Pension Plan and the Excess Plan after March 31, 2016. For more information concerning SICA's retirement plans, refer to Note 14. “Retirement Plans” in Item 8. “Financial Statements and Supplementary Data.” of our 2015 Annual Report . The following tables provide information regarding the Pension Plan: Pension Plan ($ in thousands) 2016 2015 Net Periodic Benefit Cost: Service cost $ 1,606 1,913 Interest cost 3,102 3,408 Expected return on plan assets (3,988 ) (3,990 ) Amortization of unrecognized net actuarial loss 1,480 1,643 Total net periodic cost $ 2,200 2,974 Pension Plan 2016 2015 Weighted-Average Expense Assumptions: Discount rate 4.69 % 4.29 Effective interest rate for calculation of service cost 4.52 — Effective interest rate for calculation of interest cost 4.02 — Expected return on plan assets 6.37 6.27 Rate of compensation increase 4.00 4.00 Effective January 1, 2016, the approach used to calculate the service and interest components of net periodic benefit cost for the Pension Plan was changed to provide a more precise measurement of service and interest costs. Historically, we calculated these service and interest components utilizing a single weighted-average discount rate derived from the yield curve used to measure the benefit obligation at the beginning of the period. On January 1, 2016, we elected to utilize an approach that discounts the individual expected cash flows using the applicable spot rates derived from the yield curve over the projected cash flow period. We accounted for this change prospectively as a change in accounting estimate. We presently anticipate contributing approximately $30 million to the Pension Plan in 2016 , $3.2 million of which has been funded as of March 31, 2016 .

Comprehensive Income

Comprehensive Income	3 Months Ended
	Mar. 31, 2016
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 First Quarter 2016 and First Quarter 2015 are as follows: First Quarter 2016 ($ in thousands) Gross Tax Net Net income $ 51,875 14,843 37,032 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during period 65,737 23,008 42,729 Amounts reclassified into net income: HTM securities (72 ) (25 ) (47 ) Realized losses on AFS securities 2,699 945 1,754 Total unrealized gains on investment securities 68,364 23,928 44,436 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,516 530 986 Total defined benefit pension and post-retirement plans 1,516 530 986 Other comprehensive income 69,880 24,458 45,422 Comprehensive income $ 121,755 39,301 82,454 First Quarter 2015 ($ in thousands) Gross Tax Net Net income $ 56,290 16,582 39,708 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during period 23,977 8,391 15,586 Amounts reclassified into net income: HTM securities (261 ) (91 ) (170 ) Non-credit OTTI 357 125 232 Realized gains on AFS securities (19,895 ) (6,963 ) (12,932 ) Total unrealized gains on investment securities 4,178 1,462 2,716 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,709 598 1,111 Total defined benefit pension and post-retirement plans 1,709 598 1,111 Other comprehensive income 5,887 2,060 3,827 Comprehensive income $ 62,177 18,642 43,535 The balances of, and changes in, each component of AOCI (net of taxes) as of March 31, 2016 are as follows: March 31, 2016 Net Unrealized 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, 2015 $ (282 ) 194 45,083 44,995 (54,420 ) (9,425 ) OCI before reclassifications — — 42,729 42,729 — 42,729 Amounts reclassified from AOCI — (47 ) 1,754 1,707 986 2,693 Net current period OCI — (47 ) 44,483 44,436 986 45,422 Balance, March 31, 2016 $ (282 ) 147 89,566 89,431 (53,434 ) 35,997 The reclassifications out of AOCI are as follows: Quarter ended March 31, Affected Line Item in the Unaudited Consolidated Statement of Income ($ in thousands) 2016 2015 OTTI related Non-credit OTTI on disposed securities $ — 357 Net realized (losses) gains — 357 Income before federal income tax — (125 ) Total federal income tax expense — 232 Net income HTM related Unrealized losses on HTM disposals 28 50 Net realized (losses) gains Amortization of net unrealized gains on HTM securities (100 ) (311 ) Net investment income earned (72 ) (261 ) Income before federal income tax 25 91 Total federal income tax expense (47 ) (170 ) Net income Realized losses (gains) on AFS and OTTI Realized losses (gains) on AFS disposals and OTTI 2,699 (19,895 ) Net realized (losses) gains 2,699 (19,895 ) Income before federal income tax (945 ) 6,963 Total federal income tax expense 1,754 (12,932 ) Net income Defined benefit pension and post-retirement life plans Net actuarial loss 329 371 Loss and loss expense incurred 1,187 1,338 Policy acquisition costs Total defined benefit pension and post-retirement life 1,516 1,709 Income before federal income tax (530 ) (598 ) Total federal income tax expense 986 1,111 Net income Total reclassifications for the period $ 2,693 (11,759 ) Net income

Litigation

Litigation	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 , 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.

Statements of Cash Flow (Tables

Statements of Cash Flow (Tables)	3 Months Ended
	Mar. 31, 2016
Supplemental Cash Flow Information [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Quarter ended March 31, ($ in thousands) 2016 2015 Cash paid during the period for: Interest $ 2,904 2,887 Federal income tax 8,000 4,000 Non-cash items: Exchange of fixed income securities, AFS 9,872 8,586 Corporate actions related to equity securities, AFS 1 — 389 Assets acquired under capital lease arrangements 2,598 2,428 Non-cash purchase of property and equipment 152 — 1 Examples of such corporate actions include non-cash acquisitions and stock splits.

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2016
Investments [Line Items]
Schedule of Held-to-maturity Securities	March 31, 2016 ($ in thousands) Amortized Cost Net Unrealized Gains (Losses) Carrying Value Unrecognized Holding Gains Unrecognized Holding Losses Fair Value Obligations of states and political subdivisions $ 138,203 674 138,877 5,031 — 143,908 Corporate securities 19,829 (180 ) 19,649 2,299 — 21,948 Asset-backed securities (“ABS”) 808 (70 ) 738 67 — 805 Commercial mortgage-backed securities (“CMBS”) 4,506 (197 ) 4,309 289 — 4,598 Total HTM fixed income securities $ 163,346 227 163,573 7,686 — 171,259 December 31, 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 $ 175,269 848 176,117 5,763 — 181,880 Corporate securities 20,228 (185 ) 20,043 1,972 — 22,015 ABS 1,030 (120 ) 910 118 — 1,028 CMBS 4,527 (243 ) 4,284 337 — 4,621 Total HTM fixed income securities $ 201,054 300 201,354 8,190 — 209,544
Schedule of Available-for-sale Securities	March 31, 2016 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 97,933 4,686 (1 ) 102,618 Foreign government 13,358 384 — 13,742 Obligations of states and political subdivisions 1,375,776 59,673 (134 ) 1,435,315 Corporate securities 1,948,423 45,948 (6,415 ) 1,987,956 ABS 244,924 1,060 (167 ) 245,817 CMBS 249,163 3,938 (209 ) 252,892 Residential mortgage-backed securities (“RMBS”) 555,142 7,851 (865 ) 562,128 Total AFS fixed income securities 4,484,719 123,540 (7,791 ) 4,600,468 AFS equity securities: Common stock 181,396 21,548 (325 ) 202,619 Preferred stock 12,782 388 — 13,170 Total AFS equity securities 194,178 21,936 (325 ) 215,789 Total AFS securities $ 4,678,897 145,476 (8,116 ) 4,816,257 December 31, 2015 ($ in thousands) Cost/ Amortized Cost Unrealized Gains Unrealized Losses Fair Value AFS fixed income securities: U.S. government and government agencies $ 99,485 4,721 (91 ) 104,115 Foreign government 14,885 298 (2 ) 15,181 Obligations of states and political subdivisions 1,314,779 44,523 (160 ) 1,359,142 Corporate securities 1,892,296 23,407 (15,521 ) 1,900,182 ABS 244,541 531 (918 ) 244,154 CMBS 245,252 750 (2,410 ) 243,592 RMBS 541,276 4,274 (3,713 ) 541,837 Total AFS fixed income securities 4,352,514 78,504 (22,815 ) 4,408,203 AFS equity securities: Common stock 181,991 14,796 (1,998 ) 194,789 Preferred stock 11,825 477 (40 ) 12,262 Total AFS equity securities 193,816 15,273 (2,038 ) 207,051 Total AFS securities $ 4,546,330 93,777 (24,853 ) 4,615,254
Schedule of Fair Value and Gross Pre-Tax Net Unrealized/Unrecognized Loss of Securities by Length of Time	March 31, 2016 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 $ — — 400 (1 ) Obligations of states and political subdivisions 25,867 (123 ) 820 (11 ) Corporate securities 242,392 (4,315 ) 53,418 (2,100 ) ABS 73,110 (147 ) 5,900 (20 ) CMBS 24,891 (82 ) 27,310 (127 ) RMBS 11,302 (112 ) 91,548 (753 ) Total AFS fixed income securities 377,562 (4,779 ) 179,396 (3,012 ) AFS equity securities: Common stock 5,940 (325 ) — — Total AFS equity securities 5,940 (325 ) — — Total AFS $ 383,502 (5,104 ) 179,396 (3,012 ) December 31, 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 $ 16,006 (87 ) 396 (4 ) Foreign government 1,067 (2 ) — — Obligations of states and political subdivisions 28,617 (160 ) — — Corporate securities 761,479 (12,671 ) 50,382 (2,850 ) ABS 197,477 (807 ) 12,022 (111 ) CMBS 146,944 (2,196 ) 15,385 (214 ) RMBS 264,914 (1,992 ) 63,395 (1,721 ) Total AFS fixed income securities 1,416,504 (17,915 ) 141,580 (4,900 ) AFS equity securities: Common stock 31,148 (1,998 ) — — Preferred stock 1,531 (40 ) — — Total AFS equity securities 32,679 (2,038 ) — — Total AFS $ 1,449,183 (19,953 ) 141,580 (4,900 ) 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.
Schedule of The Number Of Securities In An Unrealized Unrecognized Loss Position	($ in thousands) March 31, 2016 December 31, 2015 Number of Issues % of Market/Book Unrealized/ Unrecognized Loss Number of Issues % of Market/Book Unrealized/ Unrecognized Loss 252 80% - 99% $ 8,120 606 80% - 99% $ 22,971 — 60% - 79% — 3 60% - 79% 1,888 — 40% - 59% — — 40% - 59% — — 20% - 39% — — 20% - 39% — — 0% - 19% — — 0% - 19% — $ 8,120 $ 24,859 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 2015 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 and Maximum Exposure to Loss Associated With Each Strategy	Other Investments March 31, 2016 December 31, 2015 ($ in thousands) Carrying Value Remaining Commitment Maximum Exposure to Loss 1 Carrying Value Remaining Commitment Maximum Exposure to Loss 1 Alternative Investments Private equity $ 32,478 28,750 61,228 35,088 30,204 65,292 Private credit 21,939 25,129 47,068 13,246 15,129 28,375 Real assets 16,792 28,559 45,351 19,500 25,820 45,320 Total alternative investments 71,209 82,438 153,647 67,834 71,153 138,987 Other securities 9,707 6,850 16,557 10,008 3,200 13,208 Total other investments $ 80,916 89,288 170,204 77,842 74,353 152,195
Schedule of Aggregated Summarized Income Statement Financial Information For Partnerships In Our Alternative Investment Portfolio	Income Statement Information Quarter ended December 31, ($ in millions) 2015 2014 Net investment income $ 46.6 77.0 Realized gains 752.5 160.5 Net change in unrealized depreciation (883.2 ) (518.0 ) Net loss $ (84.1 ) (280.5 ) Selective’s insurance subsidiaries’ other investments loss $ (1.1 ) (3.5 )
Schedule of Securities Pledged As Collateral	($ in millions) FHLBI Collateral Reinsurance Collateral State and Regulatory Deposits Total U.S. government and government agencies $ 7.6 — 23.8 31.4 Obligations of states and political subdivisions — 5.0 — 5.0 Corporate securities — 4.8 — 4.8 CMBS 1.1 — — 1.1 RMBS 54.7 1.8 — 56.5 Total pledged as collateral $ 63.4 11.6 23.8 98.8
Schedule of Net Investment Income Earned	Quarter ended March 31, ($ in thousands) 2016 2015 Fixed income securities $ 31,644 30,967 Equity securities 2,230 1,792 Short-term investments 159 25 Other investments (1,066 ) (3,540 ) Investment expenses (2,198 ) (2,327 ) Net investment income earned $ 30,769 26,917
Schedule of OTTI By Asset Type	First Quarter 2016 Gross Included in Other Comprehensive Income ("OCI") Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 973 — 973 Total AFS fixed income securities 973 — 973 AFS equity securities: Common stock 2,617 — 2,617 Preferred stock 3 — 3 Total AFS equity securities 2,620 — 2,620 Total OTTI losses $ 3,593 — 3,593 First Quarter 2015 Gross Included in OCI Recognized in ($ in thousands) AFS fixed income securities: Corporate securities $ 1,009 — 1,009 RMBS 1 — 1 Total AFS fixed income securities 1,010 — 1,010 AFS equity securities: Common stock 1,084 — 1,084 Preferred stock — — — Total AFS equity securities 1,084 — 1,084 Total OTTI losses $ 2,094 — 2,094
Schedule of Components of Net Realized Gains Excluding OTTI Charges	Quarter ended March 31, ($ in thousands) 2016 2015 HTM fixed income securities Losses $ (1 ) (1 ) AFS fixed income securities Gains 620 1,502 Losses (36 ) (112 ) AFS equity securities Gains 330 21,318 Losses (20 ) (1,076 ) Other investments Losses (4 ) (654 ) Total net realized gains (excluding OTTI charges) $ 889 20,977
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 $ 83,751 85,409 Due after one year through five years 66,301 70,301 Due after five years through 10 years 13,521 15,549 Total HTM fixed income securities $ 163,573 171,259
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 $ 475,265 Due after one year through five years 2,254,485 Due after five years through 10 years 1,744,928 Due after 10 years 125,790 Total AFS fixed income securities $ 4,600,468

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of The Carrying Amounts and Estimated Fair Values of Financial Instruments	March 31, 2016 December 31, 2015 ($ in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Financial Assets Fixed income securities: HTM $ 163,573 171,259 201,354 209,544 AFS 4,600,468 4,600,468 4,408,203 4,408,203 Equity securities, AFS 215,789 215,789 207,051 207,051 Short-term investments 103,132 103,132 194,819 194,819 Financial Liabilities Short-term debt: 0.63% borrowings from FHLBI $ 15,000 15,014 15,000 14,977 1.25% borrowings from FHLBI 45,000 45,250 45,000 45,083 Total short-term debt $ 60,000 60,264 60,000 60,060 Long-term debt: 7.25% Senior Notes $ 49,899 59,406 49,898 56,929 6.70% Senior Notes 99,419 115,478 99,415 110,363 5.875% Senior Notes 185,000 192,252 185,000 192,474 Subtotal long-term debt 334,318 367,136 334,313 359,766 Unamortized debt issuance costs (6,005 ) (6,121 ) Total long-term debt $ 328,313 328,192
Schedule of Quantitative Disclosures of Our Financial Assets That Were Measured At Fair Value	March 31, 2016 Fair Value Measurements Using ($ in thousands) Assets 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 $ 102,618 42,570 60,048 — Foreign government 13,742 — 13,742 — Obligations of states and political subdivisions 1,435,315 — 1,435,315 — Corporate securities 1,987,956 — 1,987,956 — ABS 245,817 — 245,817 — CMBS 252,892 — 252,892 — RMBS 562,128 — 562,128 — Total AFS fixed income securities 4,600,468 42,570 4,557,898 — AFS equity securities: Common stock 202,619 199,347 — 3,272 Preferred stock 13,170 13,170 — — Total AFS equity securities 215,789 212,517 — 3,272 Total AFS securities 4,816,257 255,087 4,557,898 3,272 Short-term investments 103,132 103,132 — — Total assets measured at fair value $ 4,919,389 358,219 4,557,898 3,272 December 31, 2015 Fair Value Measurements Using ($ in thousands) Assets 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 $ 104,115 42,702 61,413 — Foreign government 15,181 — 15,181 — Obligations of states and political subdivisions 1,359,142 — 1,359,142 — Corporate securities 1,900,182 — 1,900,182 — ABS 244,154 — 244,154 — CMBS 243,592 — 243,592 — RMBS 541,837 — 541,837 — Total AFS fixed income securities 4,408,203 42,702 4,365,501 — AFS equity securities: Common stock 194,789 191,517 — 3,272 Preferred stock 12,262 12,262 — — Total AFS equity securities 207,051 203,779 — 3,272 Total AFS securities 4,615,254 246,481 4,365,501 3,272 Short-term investments 194,819 194,819 — — Total assets measured at fair value $ 4,810,073 441,300 4,365,501 3,272 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	March 31, 2016 Common Stock ($ in thousands) Fair value, December 31, 2015 $ 3,272 Total net (losses) gains for the period included in: OCI — Net income — Purchases 1,126 Sales (1,126 ) Issuances — Settlements — Transfers into Level 3 — Transfers out of Level 3 — Fair value, March 31, 2016 $ 3,272
Schedule of Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value	March 31, 2016 Fair Value Measurements Using ($ in thousands) Assets/ 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 $ 143,908 — 143,908 — Corporate securities 21,948 — 18,467 3,481 ABS 805 — 805 — CMBS 4,598 — 4,598 — Total HTM fixed income securities $ 171,259 — 167,778 3,481 Financial Liabilities Short-term debt: 0.63% borrowings from FHLBI $ 15,014 — 15,014 — 1.25% borrowings from FHLBI 45,250 — 45,250 — Total short-term debt $ 60,264 — 60,264 — Long-term debt: 7.25% Senior Notes $ 59,406 — 59,406 — 6.70% Senior Notes 115,478 — 115,478 — 5.875% Senior Notes 192,252 192,252 — — Total long-term debt $ 367,136 192,252 174,884 — December 31, 2015 Fair Value Measurements Using ($ in thousands) Assets/ 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 $ 181,880 — 181,880 — Corporate securities 22,015 — 18,679 3,336 ABS 1,028 — 1,028 — CMBS 4,621 — 4,621 — Total HTM fixed income securities $ 209,544 — 206,208 3,336 Financial Liabilities Short-term debt: 0.63% borrowings from FHLBI $ 14,977 — 14,977 — 1.25% borrowings from FHLBI 45,083 — 45,083 — Total short-term debt $ 60,060 — 60,060 — Long-term debt: 7.25% Senior Notes $ 56,929 — 56,929 — 6.70% Senior Notes 110,363 — 110,363 — 5.875% Senior Notes 192,474 192,474 — — Total long-term debt $ 359,766 192,474 167,292 —

Reinsurance (Tables)

Reinsurance (Tables)	3 Months Ended
	Mar. 31, 2016
Reinsurance Disclosures [Abstract]
Schedule of List Of Direct, Assumed, And Ceded Reinsurance Amounts	Quarter ended March 31, ($ in thousands) 2016 2015 Premiums written: Direct $ 646,278 598,783 Assumed 6,320 6,081 Ceded (87,239 ) (86,776 ) Net $ 565,359 518,088 Premiums earned: Direct $ 606,661 562,042 Assumed 6,270 5,908 Ceded (90,473 ) (91,827 ) Net $ 522,458 476,123 Loss and loss expense incurred: Direct $ 361,639 312,246 Assumed 6,355 4,662 Ceded (70,850 ) (31,909 ) Net $ 297,144 284,999
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 March 31, ($ in thousands) 2016 2015 Ceded premiums written $ (53,248 ) (53,842 ) Ceded premiums earned (56,814 ) (58,998 ) Ceded loss and loss expense incurred (40,718 ) (6,249 )

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Schedule of Revenue By Segment	Revenue by Segment Quarter ended March 31, ($ in thousands) 2016 2015 Standard Commercial Lines: Net premiums earned: Commercial automobile $ 95,419 86,355 Workers compensation 76,000 68,477 General liability 128,085 114,971 Commercial property 70,178 64,563 Businessowners’ policies 23,904 22,699 Bonds 5,464 5,000 Other 3,839 3,468 Miscellaneous income 690 1,669 Total Standard Commercial Lines revenue 403,579 367,202 Standard Personal Lines: Net premiums earned: Personal automobile 35,780 37,010 Homeowners 32,900 33,721 Other 1,525 1,748 Miscellaneous income 260 300 Total Standard Personal Lines revenue 70,465 72,779 E&S Lines: Net premiums earned: General liability 35,522 26,726 Commercial property 11,444 9,655 Commercial automobile 2,398 1,730 Miscellaneous income 1 — Total E&S Lines revenue 49,365 38,111 Investments: Net investment income 30,769 26,917 Net realized investment (losses) gains (2,704 ) 18,883 Total Investments revenue 28,065 45,800 Total revenues $ 551,474 523,892 Income Before Federal Income Tax Quarter ended March 31, ($ in thousands) 2016 2015 Standard Commercial Lines: Underwriting gain $ 30,932 30,036 GAAP combined ratio 92.3 % 91.8 Statutory combined ratio 89.7 89.7 Standard Personal Lines: Underwriting gain (loss) $ 8,605 (2,466 ) GAAP combined ratio 87.7 % 103.4 Statutory combined ratio 90.6 105.1 E&S Insurance Operations: Underwriting gain (loss) $ 1,418 (1,549 ) GAAP combined ratio 97.1 % 104.1 Statutory combined ratio 98.4 102.1 Investments: Net investment income $ 30,769 26,917 Net realized investment (losses) gains (2,704 ) 18,883 Total investment income, before federal income tax 28,065 45,800 Tax on investment income 6,263 12,318 Total investment income, after federal income tax $ 21,802 33,482
Schedule of Income Before Federal Income Tax	Income Before Federal Income Tax Quarter ended March 31, ($ in thousands) 2016 2015 Standard Commercial Lines: Underwriting gain $ 30,932 30,036 GAAP combined ratio 92.3 % 91.8 Statutory combined ratio 89.7 89.7 Standard Personal Lines: Underwriting gain (loss) $ 8,605 (2,466 ) GAAP combined ratio 87.7 % 103.4 Statutory combined ratio 90.6 105.1 E&S Insurance Operations: Underwriting gain (loss) $ 1,418 (1,549 ) GAAP combined ratio 97.1 % 104.1 Statutory combined ratio 98.4 102.1 Investments: Net investment income $ 30,769 26,917 Net realized investment (losses) gains (2,704 ) 18,883 Total investment income, before federal income tax 28,065 45,800 Tax on investment income 6,263 12,318 Total investment income, after federal income tax $ 21,802 33,482
Schedule of Reconciliation of Segment Results to Income Before Federal Income Tax	Reconciliation of Segment Results to Income Before Federal Income Tax Quarter ended March 31, ($ in thousands) 2016 2015 Underwriting gain, before federal income tax Standard Commercial Lines $ 30,932 30,036 Standard Personal Lines 8,605 (2,466 ) E&S Lines 1,418 (1,549 ) Investment income, before federal income tax 28,065 45,800 Total all segments 69,020 71,821 Interest expense (5,606 ) (5,604 ) General corporate and other expenses (11,539 ) (9,927 ) Income before federal income tax $ 51,875 56,290

Retirement Plans (Table)

Retirement Plans (Table)	3 Months Ended
	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Schedule of Components of Net Periodic Benefit Cost	Pension Plan ($ in thousands) 2016 2015 Net Periodic Benefit Cost: Service cost $ 1,606 1,913 Interest cost 3,102 3,408 Expected return on plan assets (3,988 ) (3,990 ) Amortization of unrecognized net actuarial loss 1,480 1,643 Total net periodic cost $ 2,200 2,974 Pension Plan 2016 2015 Weighted-Average Expense Assumptions: Discount rate 4.69 % 4.29 Effective interest rate for calculation of service cost 4.52 — Effective interest rate for calculation of interest cost 4.02 — Expected return on plan assets 6.37 6.27 Rate of compensation increase 4.00 4.00
Schedule of Weighted-Average Expense Assumptions	Pension Plan 2016 2015 Weighted-Average Expense Assumptions: Discount rate 4.69 % 4.29 Effective interest rate for calculation of service cost 4.52 — Effective interest rate for calculation of interest cost 4.02 — Expected return on plan assets 6.37 6.27 Rate of compensation increase 4.00 4.00

Comprehensive Income (Tables)

Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Schedule of Components of Comprehensive Income-Gross and Net of Tax	First Quarter 2016 ($ in thousands) Gross Tax Net Net income $ 51,875 14,843 37,032 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during period 65,737 23,008 42,729 Amounts reclassified into net income: HTM securities (72 ) (25 ) (47 ) Realized losses on AFS securities 2,699 945 1,754 Total unrealized gains on investment securities 68,364 23,928 44,436 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,516 530 986 Total defined benefit pension and post-retirement plans 1,516 530 986 Other comprehensive income 69,880 24,458 45,422 Comprehensive income $ 121,755 39,301 82,454 First Quarter 2015 ($ in thousands) Gross Tax Net Net income $ 56,290 16,582 39,708 Components of OCI: Unrealized gains on investment securities : Unrealized holding gains during period 23,977 8,391 15,586 Amounts reclassified into net income: HTM securities (261 ) (91 ) (170 ) Non-credit OTTI 357 125 232 Realized gains on AFS securities (19,895 ) (6,963 ) (12,932 ) Total unrealized gains on investment securities 4,178 1,462 2,716 Defined benefit pension and post-retirement plans: Amounts reclassified into net income: Net actuarial loss 1,709 598 1,111 Total defined benefit pension and post-retirement plans 1,709 598 1,111 Other comprehensive income 5,887 2,060 3,827 Comprehensive income $ 62,177 18,642 43,535
Schedule of Components of Accumulated Other Comprehensive Income	March 31, 2016 Net Unrealized 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, 2015 $ (282 ) 194 45,083 44,995 (54,420 ) (9,425 ) OCI before reclassifications — — 42,729 42,729 — 42,729 Amounts reclassified from AOCI — (47 ) 1,754 1,707 986 2,693 Net current period OCI — (47 ) 44,483 44,436 986 45,422 Balance, March 31, 2016 $ (282 ) 147 89,566 89,431 (53,434 ) 35,997
Schedule of Reclassifications Out Of Accumulated Other Comprehensive Income	Quarter ended March 31, Affected Line Item in the Unaudited Consolidated Statement of Income ($ in thousands) 2016 2015 OTTI related Non-credit OTTI on disposed securities $ — 357 Net realized (losses) gains — 357 Income before federal income tax — (125 ) Total federal income tax expense — 232 Net income HTM related Unrealized losses on HTM disposals 28 50 Net realized (losses) gains Amortization of net unrealized gains on HTM securities (100 ) (311 ) Net investment income earned (72 ) (261 ) Income before federal income tax 25 91 Total federal income tax expense (47 ) (170 ) Net income Realized losses (gains) on AFS and OTTI Realized losses (gains) on AFS disposals and OTTI 2,699 (19,895 ) Net realized (losses) gains 2,699 (19,895 ) Income before federal income tax (945 ) 6,963 Total federal income tax expense 1,754 (12,932 ) Net income Defined benefit pension and post-retirement life plans Net actuarial loss 329 371 Loss and loss expense incurred 1,187 1,338 Policy acquisition costs Total defined benefit pension and post-retirement life 1,516 1,709 Income before federal income tax (530 ) (598 ) Total federal income tax expense 986 1,111 Net income Total reclassifications for the period $ 2,693 (11,759 ) Net income

Statements of Cash Flow (Cash F

Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Interest		$ 2,904	$ 2,887
Federal income tax		8,000	4,000
Corporate actions related to equity securities, AFS	[1]	0	389
Assets acquired under capital lease arrangements		2,598	2,428
Non-cash purchase of property and equipment		152	0
AFS Fixed Maturity Securities [Member]
Tax-free exchange of fixed income securities		9,872	8,586
National Flood Insurance Program [Member]
Restricted cash		$ 13,500	$ 6,000
[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	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 163,346	$ 201,054
Net Unrealized Gains (Losses)	227	300
Carrying Value	163,573	201,354
Unrecognized Holding Gains	7,686	8,190
Unrecognized Holding Losses	0	0
HTM, Fair Value	$ 171,259	209,544
Held-to-maturity Securities Average Duration	1 year 7 months 18 days
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 138,203	175,269
Net Unrealized Gains (Losses)	674	848
Carrying Value	138,877	176,117
Unrecognized Holding Gains	5,031	5,763
Unrecognized Holding Losses	0	0
HTM, Fair Value	143,908	181,880
Corporate Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	19,829	20,228
Net Unrealized Gains (Losses)	(180)	(185)
Carrying Value	19,649	20,043
Unrecognized Holding Gains	2,299	1,972
Unrecognized Holding Losses	0	0
HTM, Fair Value	21,948	22,015
Asset-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	808	1,030
Net Unrealized Gains (Losses)	(70)	(120)
Carrying Value	738	910
Unrecognized Holding Gains	67	118
Unrecognized Holding Losses	0	0
HTM, Fair Value	805	1,028
Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,506	4,527
Net Unrealized Gains (Losses)	(197)	(243)
Carrying Value	4,309	4,284
Unrecognized Holding Gains	289	337
Unrecognized Holding Losses	0	0
HTM, Fair Value	$ 4,598	$ 4,621

Investments (Available-For-Sale

Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	$ 4,678,897	$ 4,546,330
Unrealized Gains	145,476	93,777
Unrealized Losses	(8,116)	(24,853)
Total AFS securities	4,816,257	4,615,254
AFS Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	4,484,719	4,352,514
Unrealized Gains	123,540	78,504
Unrealized Losses	(7,791)	(22,815)
Total AFS securities	4,600,468	4,408,203
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	97,933	99,485
Unrealized Gains	4,686	4,721
Unrealized Losses	(1)	(91)
Total AFS securities	102,618	104,115
AFS Fixed Income Securities [Member] | Foreign Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	13,358	14,885
Unrealized Gains	384	298
Unrealized Losses	0	(2)
Total AFS securities	13,742	15,181
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	1,375,776	1,314,779
Unrealized Gains	59,673	44,523
Unrealized Losses	(134)	(160)
Total AFS securities	1,435,315	1,359,142
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	1,948,423	1,892,296
Unrealized Gains	45,948	23,407
Unrealized Losses	(6,415)	(15,521)
Total AFS securities	1,987,956	1,900,182
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	244,924	244,541
Unrealized Gains	1,060	531
Unrealized Losses	(167)	(918)
Total AFS securities	245,817	244,154
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	249,163	245,252
Unrealized Gains	3,938	750
Unrealized Losses	(209)	(2,410)
Total AFS securities	252,892	243,592
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	555,142	541,276
Unrealized Gains	7,851	4,274
Unrealized Losses	(865)	(3,713)
Total AFS securities	562,128	541,837
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	194,178	193,816
Unrealized Gains	21,936	15,273
Unrealized Losses	(325)	(2,038)
Total AFS securities	215,789	207,051
Equity Securities [Member] | Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	181,396	181,991
Unrealized Gains	21,548	14,796
Unrealized Losses	(325)	(1,998)
Total AFS securities	202,619	194,789
Equity Securities [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost/Amortized Cost	12,782	11,825
Unrealized Gains	388	477
Unrealized Losses	0	(40)
Total AFS securities	$ 13,170	$ 12,262

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		Mar. 31, 2016	Dec. 31, 2015
AFS Fair Value, Less than 12 months		$ 383,502	$ 1,449,183
AFS Unrealized Losses, Less than 12 months	[1]	(5,104)	(19,953)
AFS Fair Value, 12 months or longer		179,396	141,580
AFS Unrealized Losses, 12 months or longer	[1]	(3,012)	(4,900)
AFS Fixed Income Securities [Member]
AFS Fair Value, Less than 12 months		377,562	1,416,504
AFS Unrealized Losses, Less than 12 months	[1]	(4,779)	(17,915)
AFS Fair Value, 12 months or longer		179,396	141,580
AFS Unrealized Losses, 12 months or longer	[1]	(3,012)	(4,900)
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
AFS Fair Value, Less than 12 months		0	16,006
AFS Unrealized Losses, Less than 12 months	[1]	0	(87)
AFS Fair Value, 12 months or longer		400	396
AFS Unrealized Losses, 12 months or longer	[1]	(1)	(4)
AFS Fixed Income Securities [Member] | Foreign Government [Member]
AFS Fair Value, Less than 12 months			1,067
AFS Unrealized Losses, Less than 12 months	[1]		(2)
AFS Fair Value, 12 months or longer			0
AFS Unrealized Losses, 12 months or longer	[1]		0
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
AFS Fair Value, Less than 12 months		25,867	28,617
AFS Unrealized Losses, Less than 12 months	[1]	(123)	(160)
AFS Fair Value, 12 months or longer		820	0
AFS Unrealized Losses, 12 months or longer	[1]	(11)	0
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
AFS Fair Value, Less than 12 months		242,392	761,479
AFS Unrealized Losses, Less than 12 months	[1]	(4,315)	(12,671)
AFS Fair Value, 12 months or longer		53,418	50,382
AFS Unrealized Losses, 12 months or longer	[1]	(2,100)	(2,850)
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]
AFS Fair Value, Less than 12 months		73,110	197,477
AFS Unrealized Losses, Less than 12 months	[1]	(147)	(807)
AFS Fair Value, 12 months or longer		5,900	12,022
AFS Unrealized Losses, 12 months or longer	[1]	(20)	(111)
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 months		24,891	146,944
AFS Unrealized Losses, Less than 12 months	[1]	(82)	(2,196)
AFS Fair Value, 12 months or longer		27,310	15,385
AFS Unrealized Losses, 12 months or longer	[1]	(127)	(214)
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
AFS Fair Value, Less than 12 months		11,302	264,914
AFS Unrealized Losses, Less than 12 months	[1]	(112)	(1,992)
AFS Fair Value, 12 months or longer		91,548	63,395
AFS Unrealized Losses, 12 months or longer	[1]	(753)	(1,721)
Equity Securities [Member]
AFS Fair Value, Less than 12 months		5,940	32,679
AFS Unrealized Losses, Less than 12 months	[1]	(325)	(2,038)
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		5,940	31,148
AFS Unrealized Losses, Less than 12 months	[1]	(325)	(1,998)
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			1,531
AFS Unrealized Losses, Less than 12 months	[1]		(40)
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.

Investments (Number of Securiti

Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) $ in Thousands	Mar. 31, 2016USD ($)Securities	Dec. 31, 2015USD ($)Securities
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
Unrealized Unrecognized Loss	$ 8,120	$ 24,859
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	252	606
Unrealized Unrecognized Loss	$ 8,120	$ 22,971
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	0	3
Unrealized Unrecognized Loss	$ 0	$ 1,888
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	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less carrying value	$ 83,751
Due after one year through five years carrying value	66,301
Due after five years through 10 years carrying value	13,521
Carrying Value	163,573	$ 201,354
Due in one year or less fair value	85,409
Due after one year through five years fair value	70,301
Due after five years through 10 years fair value	15,549
HTM, Fair Value	$ 171,259	$ 209,544

Investments (AFS Fixed Income s

Investments (AFS Fixed Income securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less fair value	$ 475,265
Due after one year through five years fair value	2,254,485
Due after five years through 10 years fair value	1,744,928
Due after 10 years fair value	125,790
Total AFS fixed income securities	$ 4,600,468	$ 4,408,203

Investments (Other Investment P

Investments (Other Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Carrying Value	$ 80,916	$ 77,842
Alternative Investments [Member]
Carrying Value	71,209	67,834
Remaining Commitment	82,438	71,153
Maximum Exposure to Loss	153,647	138,987
Other Investments [Member]
Carrying Value	80,916	77,842
Remaining Commitment	89,288	74,353
Maximum Exposure to Loss	170,204	152,195
Private Equity [Member] | Alternative Investments [Member]
Carrying Value	32,478	35,088
Remaining Commitment	28,750	30,204
Maximum Exposure to Loss	61,228	65,292
Private Credit [Member] | Alternative Investments [Member]
Carrying Value	21,939	13,246
Remaining Commitment	25,129	15,129
Maximum Exposure to Loss	47,068	28,375
Real Assets [Member] | Alternative Investments [Member]
Carrying Value	16,792	19,500
Remaining Commitment	28,559	25,820
Maximum Exposure to Loss	45,351	45,320
Other Securities [Member]
Carrying Value	9,707	10,008
Remaining Commitment	6,850	3,200
Maximum Exposure to Loss	$ 16,557	$ 13,208

Investments (Aggregated Income

Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Net investment income earned	$ 30,769		$ 26,917
Alternative Investments [Member]
Schedule of Equity Method Investments [Line Items]
Net investment income earned	$ (1,100)		$ (3,500)
Investments accounted for under the equity method [Member]
Schedule of Equity Method Investments [Line Items]
Net Investment Income		$ 46,600		$ 77,000
Realized gains (losses)		752,500		160,500
Net change in unrealized (depreciation) appreciation		(883,200)		(518,000)
Net income		$ (84,100)		$ (280,500)

Investments (Investments Pledge

Investments (Investments Pledged as Collateral) (Details) $ in Millions	Mar. 31, 2016USD ($)
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	$ 63.4
Securities Pledged As Collateral For Reinsurance Obligations	11.6
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	23.8
Securities Pledged As Collateral	98.8
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	7.6
Securities Pledged As Collateral For Reinsurance Obligations	0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	23.8
Securities Pledged As Collateral	31.4
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	1.1
Securities Pledged As Collateral For Reinsurance Obligations	0
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0
Securities Pledged As Collateral	1.1
Residential Mortgage Backed Securities [Member]
Investments Pledged As Collateral [Line Items]
Fixed Income Securities Pledged For FHLBI Collateral	54.7
Securities Pledged As Collateral For Reinsurance Obligations	1.8
Carrying Value Bonds On Deposit With Various State And Regulatory Agencies	0
Securities Pledged As Collateral	$ 56.5

Investments (Credit Concentrati

Investments (Credit Concentration Risk) (Details)	Mar. 31, 2016	Dec. 31, 2015
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
	Mar. 31, 2016	Mar. 31, 2015
Net Investment Income [Line Items]
Net investment income earned	$ 30,769	$ 26,917
Fixed Income Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	31,644	30,967
Equity Securities [Member]
Net Investment Income [Line Items]
Net investment income earned	2,230	1,792
Short-Term Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	159	25
Other Investments [Member]
Net Investment Income [Line Items]
Net investment income earned	(1,066)	(3,540)
Investment Expenses [Member]
Net Investment Income [Line Items]
Net investment income earned	$ (2,198)	$ (2,327)

Investments (OTTI by Asset Type

Investments (OTTI by Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OTTI Losses Gross	$ 3,593	$ 2,094
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0
OTTI Losses Recognized in Earnings	3,593	2,094
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	973	1,010
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0
OTTI Losses Recognized in Earnings	973	1,010
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
OTTI Losses Gross	973	1,009
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0
OTTI Losses Recognized in Earnings	973	1,009
Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross	2,620	1,084
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0
OTTI Losses Recognized in Earnings	2,620	1,084
Common Stock [Member] | Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross	2,617	1,084
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0
OTTI Losses Recognized in Earnings	2,617	1,084
Preferred Stock [Member] | Total AFS Securities [Member] | Equity Securities [Member]
OTTI Losses Gross	3	0
Other-than-temporary impairments on fixed income securities recognized in other comprehensive income	0	0
OTTI Losses Recognized in Earnings	$ 3	$ 0

Investments (Components Of Net

Investments (Components Of Net Realized Gains, Excluding OTTI Charges) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
HTM fixed income securities losses	$ (1)	$ (1)
Other investments losses	(4)	(654)
Total net realized gains (excluding OTTI charges)	889	20,977
Proceeds from sale of available for sale securities	17,200	138,400
Fixed Income Securities [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
AFS securities gains	620	1,502
AFS securities losses	(36)	(112)
Equity Securities [Member]
Schedule of Available-for-sale and held-to-maturity Securities [Line Items]
AFS securities gains	330	21,318
AFS securities losses	$ (20)	$ (1,076)

Indebtedness (Details)

Indebtedness (Details) - Zero Point Fifty Nine Percent Borrowing From Federal Home Loan Bank Due March 18, 2016 [Member] $ in Millions	Mar. 31, 2016USD ($)
Short-term Debt [Line Items]
Outstanding Borrowing With The Federal Home Loan Bank Of New York	$ 25
Unpaid principal amount interest rate	0.59%

Fair Value Measurements (Carryi

Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Carrying Amount [Member]
Held-to-maturity securities	$ 163,573	$ 201,354
Available-for-sale securities	4,600,468	4,408,203
Equity securities, AFS	215,789	207,051
Short-term investments	103,132	194,819
Short-term debt	60,000	60,000
Long-term debt	328,313	328,192
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Long-term debt	49,899	49,898
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
Long-term debt	99,419	99,415
Carrying Amount [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Long-term debt	185,000	185,000
Carrying Amount [Member] | Long Term Debt Excluding Issuance Costs [Member]
Long-term debt	334,318	334,313
Carrying Amount [Member] | Unamortized Debt Issuance Costs [Member]
Long-term debt	6,005	6,121
Carrying Amount [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Short-term debt	15,000	15,000
Carrying Amount [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Short-term debt	45,000	45,000
Fair Value [Member]
Held-to-maturity securities	171,259	209,544
Available-for-sale securities	4,600,468	4,408,203
Equity securities, AFS	215,789	207,051
Short-term investments	103,132	194,819
Short-term debt	60,264	60,060
Long-term debt	367,136	359,766
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Long-term debt	59,406	56,929
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
Long-term debt	115,478	110,363
Fair Value [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Long-term debt	192,252	192,474
Fair Value [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Short-term debt	15,014	14,977
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Short-term debt	$ 45,250	$ 45,083

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Debt Securities		$ 4,600,468	$ 4,408,203
Equity securities, AFS		215,789	207,051
Total AFS securities		4,816,257	4,615,254
Short-term investments		103,132	194,819
Fair Value [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		4,600,468	4,408,203
Equity securities, AFS		215,789	207,051
Total AFS securities		4,816,257	4,615,254
Short-term investments		103,132	194,819
Total assets measured at fair value		4,919,389	4,810,073
Fair Value [Member] | U.S. Government and Government Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		102,618	104,115
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		13,742	15,181
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		1,435,315	1,359,142
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		1,987,956	1,900,182
Fair Value [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		245,817	244,154
Fair Value [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		252,892	243,592
Fair Value [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		562,128	541,837
Fair Value [Member] | Common Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		202,619	194,789
Fair Value [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		13,170	12,262
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	42,570	42,702
Equity securities, AFS	[1]	212,517	203,779
Total AFS securities	[1]	255,087	246,481
Short-term investments	[1]	103,132	194,819
Total assets measured at fair value	[1]	358,219	441,300
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]	42,570	42,702
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]	199,347	191,517
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS	[1]	13,170	12,262
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	4,557,898	4,365,501
Equity securities, AFS	[1]	0	0
Total AFS securities	[1]	4,557,898	4,365,501
Short-term investments	[1]	0	0
Total assets measured at fair value	[1]	4,557,898	4,365,501
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]	60,048	61,413
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	13,742	15,181
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]	1,435,315	1,359,142
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	1,987,956	1,900,182
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	245,817	244,154
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	252,892	243,592
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities	[1]	562,128	541,837
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	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities, Debt Securities		0	0
Equity securities, AFS		3,272	3,272
Total AFS securities		3,272	3,272
Short-term investments		0	0
Total assets measured at fair value		3,272	3,272
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		3,272	3,272
Significant Unobservable Inputs (Level 3) [Member] | Preferred Stock [Member] | Fair Value, Measurements, Recurring [Member]
Equity securities, AFS		$ 0	$ 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	3 Months Ended
	Mar. 31, 2016USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, December 31, 2015	$ 3,272
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	1,126
Sales	(1,126)
Issuances	0
Settlements	0
Transfers into Level 3	0
Transfers out of Level 3	0
Fair Value, March 31, 2016	$ 3,272

Fair Value Measurements (Quan45

Fair Value Measurements (Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	$ 163,573	$ 201,354
Short-term debt	60,000	60,000
Long-term debt	328,313	328,192
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	171,259	209,544
Short-term debt	60,264	60,060
Long-term debt	367,136	359,766
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	59,406	56,929
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	115,478	110,363
Fair Value [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	192,252	192,474
Fair Value [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	15,014	14,977
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	45,250	45,083
Fair Value [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	143,908	181,880
Fair Value [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	21,948	22,015
Fair Value [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	805	1,028
Fair Value [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	4,598	4,621
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
Short-term debt	0	0
Long-term debt	192,252	192,474
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	192,252	192,474
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	0	0
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	167,778	206,208
Short-term debt	60,264	60,060
Long-term debt	174,884	167,292
Significant Other Observable Inputs (Level 2) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	59,406	56,929
Significant Other Observable Inputs (Level 2) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	115,478	110,363
Significant Other Observable Inputs (Level 2) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Significant Other Observable Inputs (Level 2) [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	15,014	14,977
Significant Other Observable Inputs (Level 2) [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	45,250	45,083
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	143,908	181,880
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	18,467	18,679
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	805	1,028
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	4,598	4,621
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	3,481	3,336
Short-term debt	0	0
Long-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Six Point Seventy Percent Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt	0	0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	3,481	3,336
Significant Unobservable Inputs (Level 3) [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity securities	$ 0	$ 0

Reinsurance (List of Direct, As

Reinsurance (List of Direct, Assumed, and Ceded Reinsurance Amounts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Premiums written:
Direct	$ 646,278	$ 598,783
Assumed	6,320	6,081
Ceded premiums written	(87,239)	(86,776)
Net	565,359	518,088
Premiums earned:
Direct	606,661	562,042
Assumed	6,270	5,908
Ceded premiums earned	(90,473)	(91,827)
Net	522,458	476,123
Loss and loss expense incurred:
Direct	361,639	312,246
Assumed	6,355	4,662
Ceded loss and loss expense incurred	(70,850)	(31,909)
Net	297,144	284,999
National Flood Insurance Program [Member]
Premiums written:
Ceded premiums written	(53,248)	(53,842)
Premiums earned:
Ceded premiums earned	(56,814)	(58,998)
Loss and loss expense incurred:
Ceded loss and loss expense incurred	$ (40,718)	$ (6,249)

Reinsurance (Ceded Premiums and

Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Ceded premiums written	$ (87,239)	$ (86,776)
Ceded premiums earned	(90,473)	(91,827)
Ceded loss and loss expense incurred	(70,850)	(31,909)
National Flood Insurance Program [Member]
Ceded premiums written	(53,248)	(53,842)
Ceded premiums earned	(56,814)	(58,998)
Ceded loss and loss expense incurred	$ (40,718)	$ (6,249)
Percentage of NFIP claims ceded by federal government	100.00%

Segment Information Narrative (

Segment Information Narrative (Details)	3 Months Ended
	Mar. 31, 2016
Number of Operating Segments	4

Segment Information (Revenue by

Segment Information (Revenue by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Total net premiums earned	$ 522,458	$ 476,123
Net investment income	30,769	26,917
Net realized investment (losses) gains	(2,704)	18,883
Total investment revenues	28,065	45,800
Other income	951	1,969
Total revenues	551,474	523,892
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	403,579	367,202
Standard Commercial Lines [Member] | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	95,419	86,355
Standard Commercial Lines [Member] | Workers Compensation [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	76,000	68,477
Standard Commercial Lines [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	128,085	114,971
Standard Commercial Lines [Member] | Commercial Property [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	70,178	64,563
Standard Commercial Lines [Member] | Business Owners' Policies [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	23,904	22,699
Standard Commercial Lines [Member] | Bonds Segment [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	5,464	5,000
Standard Commercial Lines [Member] | Other Commercial [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	3,839	3,468
Standard Commercial Lines [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	690	1,669
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	70,465	72,779
Standard Personal Lines [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	260	300
Standard Personal Lines [Member] | Personal Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	35,780	37,010
Standard Personal Lines [Member] | Homeowners [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	32,900	33,721
Standard Personal Lines [Member] | Other Personal [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	1,525	1,748
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	49,365	38,111
Excess And Surplus Operations [Member] | Commercial Automobile [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	2,398	1,730
Excess And Surplus Operations [Member] | General Liability [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	35,522	26,726
Excess And Surplus Operations [Member] | Commercial Property [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	11,444	9,655
Excess And Surplus Operations [Member] | Miscellaneous Income [Member]
Segment Reporting Information [Line Items]
Total net premiums earned	$ 1	$ 0

Segment Information (Income Bef

Segment Information (Income Before Federal Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net investment income	$ 30,769	$ 26,917
Net realized investment (losses) gains	(2,704)	18,883
Total investment revenues before federal income tax	28,065	45,800
Tax on investment income	6,263	12,318
Total investment income after federal income tax	21,802	33,482
Standard Commercial Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 30,932	$ 30,036
GAAP combined ratio	92.30%	91.80%
Statutory combined ratio	89.70%	89.70%
Standard Personal Lines [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 8,605	$ (2,466)
GAAP combined ratio	87.70%	103.40%
Statutory combined ratio	90.60%	105.10%
Excess And Surplus Operations [Member]
Segment Reporting Information [Line Items]
Underwriting gain (loss), before federal income tax	$ 1,418	$ (1,549)
GAAP combined ratio	97.10%	104.10%
Statutory combined ratio	98.40%	102.10%

Segment Information (Reconcilia

Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Investment income, before federal income tax	$ 28,065	$ 45,800
Interest expense	(5,606)	(5,604)
General corporate and other expenses	(11,539)	(9,927)
Income before federal income tax	51,875	56,290
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	30,932	30,036
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	8,605	(2,466)
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	1,418	(1,549)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total all segments	$ 69,020	$ 71,821

Retirement Plans (Components of

Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1,606	$ 1,913
Interest cost	3,102	3,408
Expected return on plan assets	(3,988)	(3,990)
Amortization of unrecognized net actuarial loss	1,480	1,643
Total net periodic cost	$ 2,200	$ 2,974

Retirement Plans (Weighted-Aver

Retirement Plans (Weighted-Average Expense Assumptions) (Details) - Pension Plan [Member] - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.69%	4.29%
Effective interest rate for calculation of service cost	4.52%	0.00%
Effective interest rate for calculation of interest cost	4.02%	0.00%
Expected return on plan assets	6.37%	6.27%
Rate of compensation increase	4.00%	4.00%
Contributions by employer	$ 3.2
Scenario, Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated contribution from the employer			$ 30

Comprehensive Income (Component

Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income, Gross	$ 51,875	$ 56,290
Unrealized holding gains during the period, Gross	65,737	23,977
Amounts reclassified into net income: HTM securities, Gross	(72)	(261)
Amounts reclassified into net income: Non-credit OTTI, Gross		357
Realized losses (gains) on AFS securities, Gross	2,699	(19,895)
Net unrealized gains, Gross	68,364	4,178
Amount reclassified into net income: Net actuarial loss, Gross	1,516	1,709
Defined pension and other post-retirement benefit plans, Gross	1,516	1,709
Other comprehensive income, Gross	69,880	5,887
Comprehensive income before tax	121,755	62,177
Net income, Tax	14,843	16,582
Unrealized holding gains (losses) during the period, Tax	23,008	8,391
Amounts reclassified into net income: HTM securities, Tax	(25)	(91)
Amounts reclassified into net income: Non-credit OTTI, Tax		125
Realized losses (gains) on AFS securities, Tax	945	(6,963)
Net unrealized gains, Tax	23,928	1,462
Amount reclassified into net income: Net actuarial loss, Tax	530	598
Defined pension and other post-retirement benefit plans, Tax	530	598
Other comprehensive income, Tax	24,458	2,060
Comprehensive income Tax	39,301	18,642
Net income	37,032	39,708
Unrealized holding gains arising during period	42,729	15,586
Amounts reclassified into net income: HTM Securities	(47)	(170)
Amounts reclassified into net income: Non-credit OTTI	0	232
Realized losses (gains) on available-for-sale securities	1,754	(12,932)
Total unrealized gains on investment securities	44,436	2,716
Amount reclassified into net income: Net actuarial loss	986	1,111
Total defined benefit pension and post-retirement plans	986	1,111
Other comprehensive income	45,422	3,827
Comprehensive income	$ 82,454	$ 43,535

Comprehensive Income (Compone55

Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2015	$ (9,425)
Amounts reclassified into net income: Non-credit OTTI	0	$ 232
OCI before reclassifications, Defined Benefit Pension and Post Retirement Plans	0
Amount reclassified into net income: Net actuarial loss	986	1,111
Amounts reclassified from AOCI, HTM related	(47)	(170)
Amounts reclassified from AOCI, All Other	1,754	(12,932)
Other comprehensive income	45,422	3,827
Other Comprehensive Income, Defined Benefit Pension and Post Retirement Plans, Adjustment, Net of Tax	986	1,111
Ending Balance, March 31, 2016	35,997
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2015	45,083
OCI before reclassifications	42,729
Other comprehensive income	44,483
Ending Balance, March 31, 2016	89,566
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2015	44,995
OCI before reclassifications	42,729
Amounts reclassified from AOCI	1,707
Other comprehensive income	44,436
Ending Balance, March 31, 2016	89,431
Accumulated Other-than-Temporary Impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2015	(282)
OCI before reclassifications	0
Other comprehensive income	0
Ending Balance, March 31, 2016	(282)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Held-to-maturity Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2015	194
OCI before reclassifications	0
Other comprehensive income	(47)
Ending Balance, March 31, 2016	147
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2015	(54,420)
Amount reclassified into net income: Net actuarial loss	986
Ending Balance, March 31, 2016	(53,434)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, December 31, 2015	(9,425)
OCI before reclassifications	42,729
Amounts reclassified from AOCI	2,693
Other comprehensive income	45,422	$ 3,827
Ending Balance, March 31, 2016	$ 35,997

Comprehensive Income (Reclassif

Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Amounts reclassified into net income: Non-credit OTTI		$ 357
Non-credit OTTI, Tax		(125)
Amounts reclassified into net income: Non-credit OTTI	$ 0	232
Reclassification of net unrealized gains on HTM securities including disposals and amortization	(72)	(261)
Total HTM related, Tax	25	91
Amounts reclassified from AOCI, HTM related	(47)	(170)
Realized losses (gains) on AFS disposals and OTTI	2,699	(19,895)
Total realized losses (gains) on AFS disposals and OTTI	(945)	6,963
Amounts reclassified into net income: realized gains on available for sale securities	1,754	(12,932)
Amount reclassified into net income: Net actuarial loss, Gross	1,516	1,709
Defined pension and other post-retirement benefit plans, Tax	(530)	(598)
Total defined benefit pension and post-retirement plans	986	1,111
Investment Income [Member]
Amortization of net unrealized gains on HTM securities	(100)	(311)
Income Before Federal Income Tax [Member]
Amounts reclassified into net income: Non-credit OTTI	0	357
Reclassification of net unrealized gains on HTM securities including disposals and amortization	(72)	(261)
Realized losses (gains) on AFS disposals and OTTI	2,699	(19,895)
Amount reclassified into net income: Net actuarial loss, Gross	1,516	1,709
Total Federal Income Tax Expense [Member]
Non-credit OTTI, Tax	0	(125)
Total HTM related, Tax	25	91
Total realized losses (gains) on AFS disposals and OTTI	(945)	6,963
Defined pension and other post-retirement benefit plans, Tax	(530)	(598)
Net Income Financial Statement Line Item [Member]
Amounts reclassified into net income: Non-credit OTTI	0	232
Amounts reclassified from AOCI, HTM related	(47)	(170)
Amounts reclassified into net income: realized gains on available for sale securities	1,754	(12,932)
Total defined benefit pension and post-retirement plans	986	1,111
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,693	(11,759)
Net Realized Investment Gains [Member]
Unrealized gains and losses on HTM disposals	28	50
Realized losses (gains) on AFS disposals and OTTI	2,699	(19,895)
Net Realized Investment Gains [Member] | Non-credit OTTI on Disposed Securities [Member]
Amounts reclassified into net income: Non-credit OTTI	0	357
Loss And Loss Expense Incurred [Member]
Amount reclassified into net income: Net actuarial loss, Gross	329	371
Policy acquisition costs [Member]
Amount reclassified into net income: Net actuarial loss, Gross	$ 1,187	$ 1,338