AmTrust Financial Services (AFSIP) 10-Q 9 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 01, 2017
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	AFSI
Entity Registrant Name	AMTRUST FINANCIAL SERVICES, INC.
Entity Central Index Key	1,365,555
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		195,805,323

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investments:
Fixed maturity securities, available-for-sale, at fair value (amortized cost $7,641,124; $7,315,041)	$ 7,774,559	$ 7,398,134
Fixed maturity securities, trading, at fair value (amortized cost $28,162; $29,081)	24,803	33,782
Equity securities, available-for-sale, at fair value (cost $81,478; $126,670)	108,830	137,162
Equity securities, trading, at fair value (cost $92,700; $76,163)	84,574	81,960
Short-term investments	239	0
Equity investment in unconsolidated subsidiaries – related party	0	151,332
Other investments (related party $71,057; $72,328)	139,661	152,187
Total investments	8,132,666	7,954,557
Cash and cash equivalents	891,591	567,771
Restricted cash and cash equivalents	855,672	713,338
Accrued interest and dividends	60,916	54,680
Premiums receivable, net	3,093,247	2,802,167
Reinsurance recoverable (related party $2,779,753; $2,452,242)	5,395,374	4,329,521
Prepaid reinsurance premium (related party $1,257,767; $1,133,485)	2,168,554	1,994,092
Other assets (related party $152,297; $189,223; recorded at fair value $396,782; $356,856)	1,798,475	1,712,165
Deferred policy acquisition costs	1,121,172	928,920
Property and equipment, net	462,343	314,332
Goodwill	808,208	686,565
Intangible assets	539,978	556,560
Total assets	25,328,196	22,614,668
LIABILITIES
Loss and loss adjustment expense reserves	11,149,511	10,140,716
Unearned premiums	5,297,190	4,880,066
Ceded reinsurance premiums payable (related party $755,666; $633,638)	856,995	804,882
Funds held under reinsurance treaties	121,940	70,868
Note payable on collateral loan – related party	167,975	167,975
Securities sold but not yet purchased, at fair value	64,947	36,394
Securities sold under agreements to repurchase, at contract value	31,698	160,270
Accrued expenses and other liabilities (recorded at fair value $103,329; $76,840)	2,455,657	1,651,626
Debt (net of debt issuance cost of $15,611, $15,960)	1,284,629	1,234,900
Total liabilities	21,430,542	19,147,697
Commitments and contingencies
Redeemable non-controlling interest	1,180	1,358
Stockholders’ equity:
Common stock, $0.01 par value; 500,000 shares authorized; 210,751 and 196,455 issued in 2017 and 2016, respectively; 195,787 and 170,508 outstanding in 2017 and 2016, respectively	2,108	1,965
Preferred stock, $0.01 par value; 10,000 shares authorized; 5,399 issued and outstanding; $913,750 aggregated liquidation preference in 2017 and 2016, respectively	913,750	913,750
Additional paid-in capital	1,625,974	1,384,922
Treasury stock at cost; 14,964 and 25,947 shares in 2017 and 2016, respectively	(243,669)	(310,883)
Accumulated other comprehensive loss, net of tax	(4,835)	(125,722)
Retained earnings	1,370,190	1,405,071
Total AmTrust Financial Services, Inc. equity	3,663,518	3,269,103
Non-controlling interest	232,956	196,510
Total stockholders’ equity	3,896,474	3,465,613
Total liabilities and stockholders' equity	$ 25,328,196	$ 22,614,668

Consolidated Balance Sheets (u3

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fixed maturities, available-for-sale, amortized cost	$ 7,641,124	$ 7,315,041
Fixed maturities, trading, amortized cost	28,162	29,081
Equity securities, available-for-sale, cost	81,478	126,670
Trading securities, cost basis	92,700	76,163
Other investments	139,661	152,187
Reinsurance recoverable	5,395,374	4,329,521
Prepaid reinsurance premium	2,168,554	1,994,092
Other assets, fair value	396,782	356,856
Other assets	1,798,475	1,712,165
Ceded reinsurance premiums payable	856,995	804,882
Accrued expenses and other current liabilities	103,329	76,840
Debt issuance costs, Net	$ 15,611	$ 15,960
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	210,751,000	196,455,000
Common stock, outstanding (in shares)	195,787,000	170,508,000
Liquidation preference	$ 913,750	$ 913,750
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred Stock, shares issued	5,399,000	5,399,000
Preferred stock, shares outstanding (in shares)	5,399,000	5,399,000
Treasury stock at cost (in shares)	14,964,000	25,947,000
Related Party Transactions
Other investments	$ 71,057	$ 72,328
Reinsurance recoverable	2,779,753	2,452,242
Prepaid reinsurance premium	1,257,767	1,133,485
Other assets	152,297	189,223
Ceded reinsurance premiums payable	$ 755,666	$ 633,638

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Premium income:
Net written premium	$ 1,371,902	$ 1,268,436	$ 2,715,968	$ 2,489,115
Change in unearned premium	8,807	(86,684)	(112,727)	(233,081)
Net earned premium	1,380,709	1,181,752	2,603,241	2,256,034
Service and fee income (related parties - three months $35,596; $21,608 and six months $55,931 and $41,771)	168,446	124,306	305,942	253,111
Net investment income	49,226	50,745	112,551	100,160
Net realized gain on investments	23,455	15,099	32,070	23,074
Total revenues	1,621,836	1,371,902	3,053,804	2,632,379
Expenses:
Loss and loss adjustment expense	1,024,478	784,393	1,864,812	1,499,466
Acquisition costs and other underwriting expenses (net of ceding commission - related party - three months $158,231; $145,610, and six months $311,933; $284,001)	373,195	294,477	701,410	566,945
Other	199,860	134,344	362,713	263,611
Total expenses	1,597,533	1,213,214	2,928,935	2,330,022
Income before other income (loss), (benefit) provision for income taxes, equity in earnings of unconsolidated subsidiaries and non-controlling interest	24,303	158,688	124,869	302,357
Other income (loss):
Interest expense (net of interest income - related party - three months $1,160; $2,187 and six months $2,318 and $4,375)	(24,229)	(17,912)	(47,830)	(33,786)
(Loss) gain on investment in life settlement contracts net of profit commission	(1,261)	12,676	7,349	23,406
Foreign currency loss	(58,948)	(28,995)	(76,916)	(67,228)
Gain on acquisition	0	39,097	0	48,775
Total other (loss) income	(84,438)	4,866	(117,397)	(28,833)
(Loss) income before (benefit) provision for income taxes, equity in earnings of unconsolidated subsidiaries and non-controlling interest	(60,135)	163,554	7,472	273,524
(Benefit) provision for income taxes	(19,727)	23,807	1,629	42,767
(Loss) income before equity in earnings of unconsolidated subsidiaries	(40,408)	139,747	5,843	230,757
Equity in earnings of unconsolidated subsidiary – related parties	69,531	4,802	73,488	10,578
Net income	29,123	144,549	79,331	241,335
Net income attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries	(6,723)	(5,817)	(17,728)	(9,834)
Net income attributable to AmTrust Financial Services, Inc.	22,400	138,732	61,603	231,501
Dividends on preferred stock	(16,571)	(11,576)	(33,142)	(20,367)
Net income attributable to AmTrust common stockholders	$ 5,829	$ 127,156	$ 28,461	$ 211,134
Earnings per common share: (usd per share)
Basic earnings per share (usd per share)	$ 0.03	$ 0.73	$ 0.16	$ 1.21
Diluted earnings per share (usd per share)	0.03	0.73	0.16	1.20
Dividends declared per common share (usd per share)	$ 0.17	$ 0.15	$ 0.34	$ 0.30

Consolidated Statements of Inc5

Consolidated Statements of Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investment income and realized gain (loss)	$ 168,446	$ 305,942	$ 253,111
Interest Income form related party	1,160	2,318	2,187	$ 4,375
Related Party Transactions
Investment income and realized gain (loss)	35,596	55,931	21,608	41,771
Ceding commission - earned	$ 158,231	$ 311,933	$ 145,610	$ 284,001

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 29,123	$ 144,549	$ 79,331	$ 241,335
Other comprehensive income, net of tax:
Foreign currency translation adjustments	62,663	(32,809)	76,526	(80,003)
Change in fair value of interest rate swap	28	168	120	287
Unrealized gain on securities:
Gross unrealized holding gain	66,029	170,466	98,060	298,119
Tax expense arising during period	16,521	62,093	22,961	106,772
Net unrealized holding gain	49,508	108,373	75,099	191,347
Reclassification adjustments for investment gain included in net income, net of tax: Other-than-temporary impairment loss	0	(10,537)	0	(10,537)
Reclassification adjustments for investment gain included in net income, net of tax: Other net realized (gain) loss on investments	(19,228)	2,920	(30,858)	2,492
Reclassification adjustments for investment gain included in net income:	(19,228)	(7,617)	(30,858)	(8,045)
Other comprehensive income, net of tax	92,971	68,115	120,887	103,586
Comprehensive income	122,094	212,664	200,218	344,921
Less: Comprehensive income attributable to redeemable non-controlling interest and non-controlling interest	6,723	5,817	17,728	9,834
Comprehensive income attributable to AmTrust Financial Services, Inc.	$ 115,371	$ 206,847	$ 182,490	$ 335,087

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income		$ 79,331	$ 241,335
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		81,503	59,865
Net amortization of bond premium or discount		10,841	9,707
Equity earnings on investment in unconsolidated subsidiaries (1)		(73,488)	(10,578)
Gain on investment in life settlement contracts, net		(7,349)	(23,406)
Net realized gain on investments		(32,070)	(40,030)
Non-cash write-down of investments		0	16,956
Discount on notes payable		3,256	2,910
Stock based compensation		11,099	11,542
Bad debt expense		17,407	8,241
Foreign currency loss		76,916	67,228
Gain on acquisition		0	(48,775)
Changes in assets - (increase) decrease:
Premiums and notes receivables		(188,177)	(376,594)
Reinsurance recoverable		(1,051,177)	(174,241)
Deferred policy acquisition costs		(184,328)	(104,759)
Prepaid reinsurance premiums		(172,816)	(392,881)
Other assets		(77,869)	205,431
Changes in liabilities - increase (decrease):
Ceded reinsurance premium payable		102,322	185,275
Loss and loss adjustment expense reserve		685,405	780,599
Unearned premiums		304,162	383,135
Funds held under reinsurance treaties		46,751	(28,041)
Accrued expenses and other liabilities		645,831	(124,170)
Net cash provided by operating activities		277,550	648,749
Cash flows from investing activities:
Purchases of fixed maturities, available-for-sale		(1,112,415)	(1,100,754)
Purchases of equity securities, available-for-sale		(11,223)	(20,424)
Purchase of equity securities, trading		(312,912)	(100,087)
Purchase of other investments		(15,593)	(11,345)
Sales, maturities, paydowns of fixed maturities, available-for-sale		988,305	699,304
Sales of equity securities, available-for-sale		151,676	11,697
Sales of equity securities, trading		309,415	102,267
Sales of other investments		65,730	1,242
Net sale of short term investments		34	7,303
Net sale (purchase) of securities sold but not purchased		21,486	(17,448)
Payment of life settlement contracts		(16,473)	0
Receipt of life settlement contract proceeds		33,163	8,058
Acquisition of subsidiaries, net of cash received	[1]	(97,786)	(118,607)
Sale of equity method investment	[2]	211,290	0
Increase in restricted cash and cash equivalents		(129,264)	(211,285)
Purchase of property and equipment		(188,743)	(84,094)
Net cash used in investing activities		(103,310)	(834,173)
Cash flows from financing activities:
Repurchase agreements, net		(128,572)	366,860
Secured loan agreements borrowings		105,559	39,361
Secured loan agreements payments		(7,488)	(3,569)
Promissory notes payments		(52,343)	0
Financing fees		(154)	0
Common stock issuance		298,747	276
Common stock repurchase		0	(103,509)
Preferred stock issuance		0	139,070
Contingent consideration payments		(5,011)	(23,446)
Non-controlling interest capital contributions from consolidated subsidiaries, net		12,437	(5,301)
Stock option exercise and other		(1,438)	(7,084)
Dividends distributed on common stock		(58,097)	(52,624)
Dividends distributed on preferred stock		(33,142)	(20,367)
Net cash provided by financing activities		130,498	329,667
Effect of exchange rate changes on cash		19,082	(20,613)
Net increase in cash and cash equivalents		323,820	123,630
Cash and cash equivalents, beginning of the year		567,771	1,003,916
Cash and cash equivalents, end of the period		$ 891,591	$ 1,127,546
[1]	Primarily relates to the acquisitions of AmeriHeath Casualty Insurance Company, PDP Group, Inc., and other immaterial subsidiaries. See Note 11 for more information.
[2]	2017 amounts relate to the sale of shares of National General Holding Corp. See Note 10 for more information.

Basis of Reporting

Basis of Reporting	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Reporting	Basis of Reporting The accompanying unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial statements and with the instructions to Form 10-Q and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These interim statements should be read in conjunction with the consolidated financial statements and notes thereto included in the AmTrust Financial Services, Inc. (“AmTrust” or the “Company”) Annual Report on Form 10-K for the year ended December 31, 2016 , previously filed with the Securities and Exchange Commission (“SEC”) on April 4, 2017 . These interim consolidated financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair presentation of the results for the interim period and all such adjustments are of a normal recurring nature. The results of operations for the interim period are not necessarily indicative, if annualized, of those to be expected for the full year. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. A detailed description of the Company’s significant accounting policies and management judgments is located in the audited consolidated financial statements for the year ended December 31, 2016 , included in the Company’s Annual Report on Form 10-K ("Form 10-K") filed with the SEC. All material inter-company transactions and accounts have been eliminated in the consolidated financial statements. To facilitate period-to-period comparisons, certain reclassifications have been made to prior period consolidated financial statement amounts to conform to current period presentation. As previously disclosed, on March 14, 2017 , the Audit Committee of our Board of Directors, in consultation with management and our current and former independent registered public accounting firms, concluded that our previously issued Consolidated Financial Statements for fiscal years 2015 and 2014 , along with each of the four quarters included in fiscal year 2015 as well as the first three quarters of fiscal year 2016 , needed to be restated. Accordingly, within this report, we have included restated unaudited quarterly financial statements for the second quarter of 2016 . See our Form 10-K for the year ended December 31, 2016 and Quarterly Report on Form 10-Q/A for the period ended June 30, 2016 for more information.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements With the exception of those discussed below, there have been no recent accounting pronouncements or changes in accounting pronouncements during the six months ended June 30, 2017 , as compared to those described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2016 , that are of significance, or potential significance, to the Company. Recent Accounting Standards, Adopted In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, classification on the statement of cash flows, and accounting for forfeitures. The adoption of this guidance on January 1, 2017 did not have a material effect on the Company's results of operations, financial position or cash flows. In March 2016, the FASB issued ASU 2016-07, Investments-Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting , which eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The guidance requires the equity method investor to add the cost of acquiring additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company adopted this guidance on a prospective basis. The adoption of this guidance on January 1, 2017 did not have a material effect on the Company's results of operations, financial position or cash flows. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments , which clarifies the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment under the amended guidance in this ASU is required to assess the embedded call (put) options solely in accordance with the four-step decision sequence prescribed by Topic 815. The Company adopted this guidance on a modified retrospective basis. The adoption of this guidance on January 1, 2017 did not have a material effect on the Company's results of operations, financial position or cash flows. In March 2016, the FASB issued ASU 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships , which clarifies that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument under Topic 815 does not, in and of itself, require designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The Company adopted this guidance on a modified retrospective basis. The adoption of this guidance on January 1, 2017 did not have a material effect on the Company's results of operations, financial position or cash flows. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business , which clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The guidance specifies that when substantially all of the fair value of gross assets acquired is concentrated in a single asset (or a group of similar assets), the assets acquired would not represent a business. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill, and consolidation. The guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those periods. Early adoption is permitted and prospective application is required. The Company early adopted this guidance effective January 1, 2017. The adoption of this guidance did not have a material impact on the Company's results of operations, financial position or cash flows. Recent Accounting Standards, Not Yet Adopted In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities . The new guidance shortens the amortization period for the premium on callable debt securities to the earliest call date. The amortization period for the discount on callable debt securities is not changed by the new guidance, and continues to be amortized to maturity. The new guidance more closely aligns interest income recorded on debt securities held at a premium or a discount with the economics of the underlying instrument. The guidance is effective for annual periods beginning after December 15, 2018, including interim periods within those periods. Early adoption is permitted, including adoption in an interim period. If an entity early adopts in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations , which improves the operability and understandability of the implementation guidance on principal versus agent considerations by clarifying that 1) an entity determines whether it is a principal or an agent for each specific good or service promised to the customer; 2) an entity determines the nature of each specific good or service; 3) when another party is involved in providing goods or services to a customer, an entity that is a principal obtains control of (a) a good or another asset from the other party that it then transfers to the customer, (b) a right to a service that will be performed by another party, which gives the entity the ability to direct that party to provide the service to the customer on the entity's behalf, or (c) a good or service from the other party that is combined with other goods or services to provide the specific good or service to the customer; and 4) the purpose of the indicators in paragraph 606-10-55-39 in Topic 606 is to support or assist in the assessment of control. The effective date and transition requirement for this ASU are the same as the effective date and transition requirements of ASU 2014-09, which were deferred to the quarter ending March 31, 2018 by ASU 2015-14. Adoption of this ASU is not expected to have a material impact on the Company's insurance operations, but may have a material impact on the Company's non-insurance operations. In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires that an employer present service cost in the same line item or items as other current employee compensation costs, and present the remaining components of net benefit cost in one or more separate line items outside of income from operations (if that subtotal is presented). In addition, this ASU limits the components of net benefit cost eligible to be capitalized to service cost. This guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those annual periods. This standard is not expected to have a material impact on the Company's financial position, results of operations or cash flows. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU requires lessees to put most leases on their balance sheets as a lease liability with a corresponding right-of-use asset, but continue to recognize the related leasing expense within net income. The definition of a lease was modified to exemplify the concept of control over an asset identified in the lease. Lease classification criteria remains substantially similar to criteria in current lease guidance. The guidance defines which payments can be used in determining lease classification. For short-term leases with a term of 12 months or less, lessees can make a policy election not to recognize lease assets and lease liabilities. Lessor accounting is largely unchanged. Leveraged leases that commenced before the effective date of the new guidance are grandfathered. New disclosures are required, and certain practical expedients are allowed upon adoption. This accounting and disclosure guidance will be effective for interim and annual reporting periods beginning after December 15, 2018 and should be implemented using the modified retrospective approach. Early adoption is permitted. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In February 2017, the FASB issued ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, which clarifies that ASC 610-20 applies to the derecognition of nonfinancial assets and in substance nonfinancial assets unless other specific guidance applies. As a result, the new guidance will not apply to the derecognition of businesses, nonprofit activities, or financial assets (including equity method investments), or to revenue transactions (contracts with customers). The new guidance also clarifies that an in substance nonfinancial asset is an asset or group of assets for which substantially all of the fair value consists of nonfinancial assets and the group or subsidiary is not a business. In addition, transfers of nonfinancial assets to another entity in exchange for a noncontrolling ownership interest in that entity will be accounted for under ASC 610-20, removing specific guidance on such partial exchanges from ASC 845, Nonmonetary Transactions . As a result of the new guidance, the guidance specific to real estate sales in ASC 360-20 will be eliminated. As such, sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. This guidance is effective for fiscal years beginning after December 15, 2017, including interim reporting periods within that reporting period. Early adoption is permitted, but only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is currently evaluating the effect that the updated standard will have on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment , which simplifies the accounting for goodwill impairment charges. Under the current guidance, if the fair value of a reporting unit is lower than its carrying amount, an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount. The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value. Under the new guidance, an entity will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value not to exceed the amount of goodwill allocated to that reporting unit. The guidance is effective in fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is evaluating the requirements of this guidance and the potential impact on the Company’s financial position and results of operations.

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments (a) Available-for-Sale Securities The cost or amortized cost, gross unrealized gains and losses, and estimated fair value of fixed maturity and equity securities classified as available-for-sale as of June 30, 2017 and December 31, 2016 , are presented below: Cost or amortized cost Gross unrealized gains Gross unrealized losses Fair Value Fixed Maturity Securities: U.S. treasury securities $ 356,281 $ 1,177 $ (1,711 ) $ 355,747 U.S. government agencies 13,762 41 (7 ) 13,796 Municipal bonds 925,039 15,092 (5,318 ) 934,813 Foreign government 190,445 4,238 (1,113 ) 193,570 Corporate bonds: Finance 1,554,129 44,021 (3,080 ) 1,595,070 Industrial 2,220,747 61,374 (8,288 ) 2,273,833 Utilities 369,235 10,948 (1,430 ) 378,753 Commercial mortgage-backed securities 474,262 4,594 (4,551 ) 474,305 Residential mortgage-backed securities: Agency backed 902,351 13,527 (6,099 ) 909,779 Non-agency backed 4,326 2 (95 ) 4,233 Collateralized loan / debt obligation 501,560 9,747 (385 ) 510,922 Asset backed securities 128,987 878 (127 ) 129,738 Total fixed maturity securities $ 7,641,124 $ 165,639 $ (32,204 ) $ 7,774,559 Equity Securities: Preferred stock $ 756 $ 21 $ — $ 777 Common stock 80,722 28,358 (1,027 ) 108,053 Total equity securities $ 81,478 $ 28,379 $ (1,027 ) $ 108,830 Cost or amortized cost Gross unrealized gains Gross unrealized losses Fair value Fixed Maturity Securities: U.S. treasury securities $ 331,036 $ 1,235 $ (1,617 ) $ 330,654 U.S. government agencies 63,467 282 (17 ) 63,732 Municipal bonds 860,444 9,603 (15,877 ) 854,170 Foreign government 149,365 4,237 (726 ) 152,876 Corporate bonds: Finance 1,535,606 38,404 (7,722 ) 1,566,288 Industrial 2,222,843 62,133 (17,115 ) 2,267,861 Utilities 195,607 4,433 (1,210 ) 198,830 Commercial mortgage backed securities 178,092 2,464 (2,562 ) 177,994 Residential mortgage backed securities: Agency backed 1,210,229 13,685 (13,529 ) 1,210,385 Non-agency backed 61,646 586 (1,003 ) 61,229 Collateralized loan / debt obligations 476,767 8,389 (751 ) 484,405 Asset backed securities 29,939 31 (260 ) 29,710 Total fixed maturity securities $ 7,315,041 $ 145,482 $ (62,389 ) $ 7,398,134 Equity Securities: Preferred stock $ 4,044 $ — $ (59 ) $ 3,985 Common stock 122,626 12,899 (2,348 ) 133,177 Total equity securities $ 126,670 $ 12,899 $ (2,407 ) $ 137,162 Investments in foreign government securities include securities issued by national entities as well as instruments that are unconditionally guaranteed by such entities. As of June 30, 2017 , the Company's foreign government securities were issued or guaranteed primarily by governments in Europe, Canada and Israel. Proceeds from the sale of investments in available-for-sale securities were approximately $623,177 and $585,894 , respectively, during the three months ended June 30, 2017 and 2016 , and were approximately $1,139,981 and $711,001 , respectively, for the six months ended June 30, 2017 and 2016 . A summary of the Company’s available-for-sale fixed maturity securities as of June 30, 2017 and December 31, 2016 , by contractual maturity, is shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2017 December 31, 2016 Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 265,819 $ 266,562 $ 319,275 $ 319,882 Due after one through five years 3,152,712 3,216,906 2,956,429 2,998,711 Due after five through ten years 1,737,598 1,780,579 1,645,211 1,683,112 Due after ten years 473,509 481,535 437,452 432,702 Mortgage and asset backed securities 2,011,486 2,028,977 1,956,674 1,963,727 Total fixed maturity securities $ 7,641,124 $ 7,774,559 $ 7,315,041 $ 7,398,134 The tables below summarize the gross unrealized losses of our fixed maturity and equity securities by length of time the security has continuously been in an unrealized loss position as of June 30, 2017 and December 31, 2016 : Less Than 12 Months 12 Months or More Total As of June 30, 2017 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturity Securities: U.S. treasury securities $ 296,565 $ (1,709 ) $ 689 $ (2 ) $ 297,254 $ (1,711 ) U.S. government agencies 4,261 (7 ) — — 4,261 (7 ) Municipal bonds 382,730 (5,087 ) 8,526 (231 ) 391,256 (5,318 ) Foreign government 78,986 (1,046 ) 1,933 (67 ) 80,919 (1,113 ) Corporate bonds: Finance 295,860 (3,068 ) 4,032 (12 ) 299,892 (3,080 ) Industrial 459,696 (8,024 ) 11,821 (264 ) 471,517 (8,288 ) Utilities 79,036 (1,429 ) 507 (1 ) 79,543 (1,430 ) Commercial mortgage-backed securities 254,002 (4,118 ) 8,165 (433 ) 262,167 (4,551 ) Residential mortgage-backed securities: Agency backed 405,149 (6,038 ) 2,488 (61 ) 407,637 (6,099 ) Non-agency backed 1,569 (10 ) 2,539 (85 ) 4,108 (95 ) Collateralized loan / debt obligations 61,780 (379 ) 800 (6 ) 62,580 (385 ) Asset backed securities 21,888 (98 ) 1,587 (29 ) 23,475 (127 ) Total fixed maturity securities $ 2,341,522 $ (31,013 ) $ 43,087 $ (1,191 ) $ 2,384,609 $ (32,204 ) Equity Securities: Common stock $ 12,077 $ (1,027 ) $ — $ — $ 12,077 $ (1,027 ) Less Than 12 Months 12 Months or More Total As of December 31, 2016 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturity Securities: U.S. treasury securities $ 293,155 $ (1,613 ) $ 22,989 $ (4 ) $ 316,144 $ (1,617 ) U.S. government agencies 7,866 (17 ) — — 7,866 (17 ) Municipal bonds 519,578 (15,207 ) 15,742 (670 ) 535,320 (15,877 ) Foreign government 128,863 (688 ) 12,659 (38 ) 141,522 (726 ) Corporate bonds: Finance 1,071,982 (7,210 ) 16,840 (512 ) 1,088,822 (7,722 ) Industrial 1,200,129 (13,648 ) 114,035 (3,467 ) 1,314,164 (17,115 ) Utilities 119,488 (423 ) 10,391 (787 ) 129,879 (1,210 ) Commercial mortgage-backed securities 71,780 (1,654 ) 10,910 (908 ) 82,690 (2,562 ) Residential mortgage-backed securities: Agency backed 718,098 (13,469 ) 8,144 (60 ) 726,242 (13,529 ) Non-agency backed 24,372 (869 ) 4,462 (134 ) 28,834 (1,003 ) Collateralized loan / debt obligations 97,923 (433 ) 32,937 (318 ) 130,860 (751 ) Asset backed securities 9,220 (124 ) 4,926 (136 ) 14,146 (260 ) Total fixed maturity securities $ 4,262,454 $ (55,355 ) $ 254,035 $ (7,034 ) $ 4,516,489 $ (62,389 ) Equity Securities: Preferred stock $ 529 $ (30 ) $ — $ (29 ) $ 529 $ (59 ) Common stock 46,254 (1,394 ) 9,991 (954 ) 56,245 (2,348 ) Total equity securities $ 46,783 $ (1,424 ) $ 9,991 $ (983 ) $ 56,774 $ (2,407 ) There are 1,695 and 2,125 securities at June 30, 2017 and December 31, 2016 , respectively, that account for the gross unrealized loss, none of which is deemed by the Company to be other-than-temporarily impaired ("OTTI"). At June 30, 2017 , the Company determined that the unrealized losses on fixed maturity securities were primarily due to market interest rate movements since their date of purchase. On a quarterly basis, the Company analyzes securities in an unrealized loss position for OTTI. The Company considers an investment to be impaired when it has been in an unrealized loss position greater than a de minimis threshold for over 12 months, excluding securities backed by the U.S. government (e.g., U.S. treasury securities or agency-backed residential mortgage-backed securities). Additionally, the Company reviews whether any of the impaired positions related to securities for which OTTI was previously recognized, and whether the Company intends to sell any of the securities in an unrealized loss position. Once the Company completes the analysis described above, each security is further evaluated to assess whether the decline in the fair value of any investment below its cost basis is deemed other-than-temporary. The Company considers many factors in completing its quarterly review of securities with unrealized losses for OTTI. For equity securities, the Company considers the length of time and the extent to which the fair value has been below cost, the financial condition and near-term prospects of the issuer, including any specific events that may influence the operations of the issuer, and the intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value. For fixed maturity securities, the Company considers among other things, the length of time and the extent to which the fair value has been less than the amortized cost basis, adverse conditions and near-term prospects for improvement specifically related to the issuer, industry or geographic area, the historical and implied volatility of the fair value of the security, any information obtained from regulators and rating agencies, the issuer’s capital strength and the payment structure of the security and the likelihood the issuer will be able to make payments in the future (or the historical failure of the issuer to make scheduled interest or principal payments or payment of dividends). For equity securities, a decline in fair value that is considered to be other-than-temporary is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. For fixed maturity securities where the Company intends to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost, a decline in fair value is considered to be other-than-temporary and is recognized in net income based on the fair value of the security at the time of assessment, resulting in a new cost basis for the security. If the decline in fair value of a fixed maturity security below its amortized cost is considered to be other-than-temporary based upon other considerations, the Company compares the estimated present value of the cash flows expected to be collected to the amortized cost of the security. The extent to which the estimated present value of the cash flows expected to be collected is less than the amortized cost of the security represents the credit-related portion of the other-than-temporary impairment, which is recognized in net income, resulting in a new cost basis for the security. Any remaining decline in fair value represents the non-credit portion of the other-than-temporary impairment, which is recognized in other comprehensive income (loss). There were no credit-related OTTI charges for the three and six months ended June 30, 2017 . (b) Trading Securities The original or amortized cost, estimated fair value and gross unrealized gains and losses of trading securities as of June 30, 2017 and December 31, 2016 are presented in the tables below: As of June 30, 2017 Original or amortized cost Gross unrealized gains Gross unrealized losses Fair value Fixed Maturity Securities Municipal bonds $ 837 $ — $ (8 ) $ 829 Corporate bonds: Industrial 27,325 140 (3,491 ) 23,974 Total Fixed Maturity Securities $ 28,162 $ 140 $ (3,499 ) $ 24,803 Common stock $ 92,700 $ 2,847 $ (10,973 ) $ 84,574 As of December 31, 2016 Original or amortized cost Gross unrealized gains Gross unrealized losses Fair value Fixed Maturity Securities Corporate bonds: Industrial $ 24,151 $ 4,379 $ — $ 28,530 Utilities 4,930 322 — 5,252 Total Fixed Maturity Securities $ 29,081 $ 4,701 $ — $ 33,782 Common stock $ 76,163 $ 9,842 $ (4,045 ) $ 81,960 Proceeds from the sale of investments in trading securities were approximately $177,570 and $49,517 , respectively, during the three months ended June 30, 2017 and 2016 , and were approximately $309,415 and $102,267 , respectively, during the six months ended June 30, 2017 and 2016 . The table below shows the portion of trading gains and losses for the period related to trading securities still held during the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net gains and losses recognized during the period on trading securities $ (11,980 ) $ (260 ) $ (15,240 ) $ 2,496 Less: Net gains and losses recognized during the period on trading securities sold during the period (2,065 ) 1,014 651 7,387 Unrealized gains and losses recognized during the reporting period on trading securities still held at the reporting date $ (9,915 ) $ (1,274 ) $ (15,891 ) $ (4,891 ) (c) Investment Income Net investment income for the three and six months ended June 30, 2017 and 2016 was derived from the following sources: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Fixed maturity securities, available-for-sale $ 69,381 $ 46,235 $ 126,650 $ 92,428 Equity securities, available-for-sale 169 4,098 1,569 6,462 Fixed maturity securities, trading — — 1,032 — Equity securities, trading 2 (125 ) 20 (278 ) Cash and short term investments 1,888 686 3,282 1,772 Other invested assets (1) (19,240 ) — (15,001 ) — 52,200 50,894 117,552 100,384 Less: Investment expenses (2,974 ) (149 ) (5,001 ) (224 ) $ 49,226 $ 50,745 $ 112,551 $ 100,160 (1) Includes losses from equity method investments. (d) Realized Gains and Losses The tables below summarize the gross and net realized gains and (losses) for the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, 2017 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 14,136 $ (793 ) $ 13,343 Equity securities, available-for-sale 7,288 (958 ) 6,330 Fixed maturity securities, trading 2,819 (4,335 ) (1,516 ) Equity securities, trading 2,401 (12,865 ) (10,464 ) Other investments 15,762 — 15,762 $ 42,406 $ (18,951 ) $ 23,455 Three Months Ended June 30, 2016 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 35,008 $ (1,571 ) $ 33,437 Equity securities, available-for-sale 608 (658 ) (50 ) Equity securities, trading 5,315 (5,575 ) (260 ) Other investments 4 (1,076 ) (1,072 ) Write-down of equity securities, available-for-sale — (16,956 ) (16,956 ) $ 40,935 $ (25,836 ) $ 15,099 Six Months Ended June 30, 2017 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 22,447 $ (2,056 ) $ 20,391 Equity securities, available-for-sale 12,511 (1,599 ) 10,912 Fixed maturity securities, trading 5,193 (9,769 ) (4,576 ) Equity securities, trading 8,487 (19,151 ) (10,664 ) Other investments 16,027 (20 ) 16,007 $ 64,665 $ (32,595 ) $ 32,070 Six Months Ended June 30, 2016 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 39,811 $ (1,617 ) $ 38,194 Equity securities, available-for-sale 1,268 (799 ) 469 Equity securities, trading 14,927 (12,431 ) 2,496 Other investments 4 (1,133 ) (1,129 ) Write-down of equity securities, available-for-sale — (16,956 ) (16,956 ) $ 56,010 $ (32,936 ) $ 23,074 On June 9, 2017 , the Company announced that it entered into agreements to sell 10,586 common shares of National General Holdings Corp. (“NGHC”), a related party, at a price of $20.00 per share (representing a discount of 8.3% to NGHC's common stock closing market price on the Nasdaq Stock Exchange on June 8, 2017 ). The sale was completed through separate, privately negotiated purchase agreements with unaffiliated third parties and resulted in a $68,425 realized gain, which is reflected in the Equity in earnings of unconsolidated subsidiaries - related parties caption on the Consolidated Statements of Income. (f) Restricted Cash and Investments The Company, in order to conduct business in certain states, is required to maintain letters of credit or assets on deposit to support state mandated regulatory requirements and certain third party agreements. The Company also utilizes trust accounts to collateralize business with its reinsurance counterparties. These assets are primarily in the form of cash and certain high grade securities. The fair values of the Company's restricted assets as of June 30, 2017 and December 31, 2016 are as follows: June 30, 2017 December 31, 2016 Restricted cash and cash equivalents $ 855,672 $ 713,338 Restricted investments - fixed maturity at fair value 2,602,094 2,126,216 Total restricted cash, cash equivalents, and investments $ 3,457,766 $ 2,839,554 (g) Other Securities sold but not yet purchased are securities that the Company has sold, but does not own, in anticipation of a decline in the market value of the security. For more information related to these agreements, please see Note 4 to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016. The Company’s liability for securities to be delivered is measured at their fair value and was $64,947 and $36,394 as of June 30, 2017 and December 31, 2016 , respectively. From time to time, the Company enters into repurchase agreements that are subject to a master netting arrangement, which are accounted for as collateralized borrowing transactions and are recorded at contract amounts. The Company receives cash or securities that it invests or holds in short term or fixed income securities. As of June 30, 2017 , the Company had two outstanding repurchase agreements with one counter-party. The principal amount of these agreements totaled $31,698 , which approximates fair value. These repurchase agreements bore interest at a rate of 1.37% . The Company had approximately $33,149 of collateral pledged in support of these agreements. Interest expense associated with these repurchase agreements was $12 for the three and six months ended June 30, 2017. As of December 31, 2016, the Company had thirteen repurchase agreements with an outstanding principal amount of $160,270 , which approximates fair value, at interest rates between 0.75% and 0.90% . The Company had approximately $175,700 of collateral pledged in support of these agreements.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The following tables present the level within the fair value hierarchy at which the Company’s financial assets and financial liabilities are measured on a recurring basis as of June 30, 2017 and December 31, 2016 : As of June 30, 2017 Total Level 1 Level 2 Level 3 Financial Assets: U.S. treasury securities $ 355,747 $ 355,747 $ — $ — U.S. government agencies 13,796 — 13,796 — Municipal bonds 935,642 — 935,642 — Foreign government 193,570 — 191,359 2,211 Corporate bonds and other bonds: Finance 1,595,070 — 1,581,452 13,618 Industrial 2,297,807 — 2,295,722 2,085 Utilities 378,753 — 378,753 — Commercial mortgage-backed securities 474,305 — 450,707 23,598 Residential mortgage-backed securities: Agency backed 909,779 — 909,779 — Non-agency backed 4,233 — 4,233 — Collateralized loan / debt obligations 510,922 — 510,922 — Asset-backed securities 129,738 — 129,738 — Equity securities, available-for-sale 108,830 86,584 898 21,348 Equity securities, trading 84,574 82,498 25 2,051 Life settlement contracts 396,782 — — 396,782 Total Financial Assets $ 8,389,548 $ 524,829 $ 7,403,026 $ 461,693 Financial Liabilities: Securities sold but not yet purchased, at fair value $ 64,947 $ 64,947 $ — $ — Securities sold under agreements to repurchase, at contract value 31,698 — 31,698 — Life settlement contract profit commission 5,714 — — 5,714 Contingent consideration 97,615 — — 97,615 Total Financial Liabilities $ 199,974 $ 64,947 $ 31,698 $ 103,329 As of December 31, 2016 Total Level 1 Level 2 Level 3 Financial Assets: U.S. treasury securities $ 330,654 $ 330,654 $ — $ — U.S. government agencies 63,732 — 63,732 — Municipal bonds 854,170 — 854,170 — Foreign government 152,876 — 149,298 3,578 Corporate bonds and other bonds: Finance 1,566,288 — 1,559,800 6,488 Industrial 2,296,391 — 2,291,351 5,040 Utilities 204,082 — 199,503 4,579 Commercial mortgage-backed securities 177,994 — 177,994 — Residential mortgage-backed securities: Agency backed 1,210,385 — 1,186,315 24,070 Non-agency backed 61,229 — 58,109 3,120 Collateralized loan / debt obligations 484,405 — 484,405 — Asset-backed securities 29,710 — 29,710 — Equity securities, available-for-sale 137,162 66,228 49,618 21,316 Equity securities, trading 81,960 78,827 — 3,133 Life settlement contracts 356,856 — — 356,856 Total Financial Assets $ 8,007,894 $ 475,709 $ 7,104,005 $ 428,180 Financial Liabilities: Securities sold but not yet purchased, at fair value $ 36,394 $ 36,394 $ — $ — Fixed maturity securities sold but not yet purchased 160,270 — 160,270 — Life settlement contract profit commission 4,940 — — 4,940 Contingent consideration (as restated) 71,657 — — 71,657 Derivatives 243 — 243 — Total Financial Liabilities $ 273,504 $ 36,394 $ 160,513 $ 76,597 Transfers between Level 1 and Level 2 for all periods presented are due to changes in the availability of observable market information and re-evaluation of the observability of pricing inputs. During the period ended June 30, 2017 , there were $34,318 of transfers from Level 2 to Level 1. The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets and liabilities for the three and six months ended June 30, 2017 and 2016 . The transfers into and out of Level 3 were due to changes in the availability of market observable inputs. All transfers are reflected in the table at fair value as of the end of the reporting period. Balance as of March 31, 2017 Net income (loss) Other comprehensive income Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, Equity securities, trading $ 4,117 $ (74 ) $ — $ — $ — $ (1,992 ) $ 2,051 Equity securities, available-for-sale 17,383 — 93 76 (16,748 ) 20,544 21,348 Fixed maturities, available-for-sale 35,173 — 225 5,166 (2,312 ) 3,260 41,512 Life settlement contracts 397,493 13,121 — 1,250 (15,082 ) — 396,782 Life settlement contract profit commission (5,599 ) (115 ) — — — — (5,714 ) Contingent consideration (72,330 ) (3,117 ) — (27,179 ) 5,011 — (97,615 ) Total $ 376,237 $ 9,815 $ 318 $ (20,687 ) $ (29,131 ) $ 21,812 $ 358,364 Balance as of December 31, 2016 Net income (loss) Other comprehensive income (loss) Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, 2017 Equity securities, trading $ 3,133 $ (422 ) $ — $ 4,484 $ (2,134 ) $ (3,010 ) $ 2,051 Equity securities, available-for-sale 21,316 — 338 76 (16,748 ) 16,366 21,348 Fixed maturities, available-for-sale 46,875 — (489 ) 7,505 (2,775 ) (9,604 ) 41,512 Life settlement contracts 356,856 48,616 — 16,473 (25,163 ) — 396,782 Life settlement contract profit commission (4,940 ) (774 ) — — — — (5,714 ) Contingent consideration (71,657 ) (3,790 ) — (27,179 ) 5,011 — (97,615 ) Total $ 351,583 $ 43,630 $ (151 ) $ 1,359 $ (41,809 ) $ 3,752 $ 358,364 Balance as of March 31, 2016 Net income (loss) Other comprehensive loss Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, Equity securities, available-for-sale $ 25,556 $ — $ (776 ) $ (16 ) $ — $ — $ 24,764 Life settlement contracts 294,573 28,532 — 11,330 (30,001 ) — 304,434 Life settlement contract profit commission (7,168 ) (1,886 ) — — — — (9,054 ) Contingent consideration (73,867 ) (3,587 ) — (11,461 ) 13,143 — (75,772 ) Total $ 239,094 $ 23,059 $ (776 ) $ (147 ) $ (16,858 ) $ — $ 244,372 Balance as of January 1, 2016 Net income (loss) Other comprehensive loss Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, Equity securities, available-for-sale $ 37,211 $ — $ (12,449 ) $ 2 $ — $ — $ 24,764 Life settlement contracts 264,001 59,161 — 11,330 (30,058 ) — 304,434 Life settlement contract profit commission (15,406 ) (9,054 ) — — 15,406 — (9,054 ) Contingent consideration (as restated) (84,760 ) (5,998 ) — (8,460 ) 23,446 — (75,772 ) Total $ 201,046 $ 44,109 $ (12,449 ) $ 2,872 $ 8,794 $ — $ 244,372 A reconciliation of net income for life settlement contracts in the above table to gain (loss) on investment in life settlement contracts net of profit commission included in the Consolidated Statements of Income for the three and six months ended June 30, 2017 and 2016 is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net income $ 13,121 $ 28,532 $ 48,616 $ 59,161 Premiums paid (13,460 ) (13,354 ) (38,734 ) (25,456 ) Profit commission (115 ) (1,886 ) (774 ) (9,054 ) Other expenses (807 ) (616 ) (1,759 ) (1,245 ) (Loss) gain on investment in life settlement contracts $ (1,261 ) $ 12,676 $ 7,349 $ 23,406 The Company uses the following methods and assumptions in estimating its fair value disclosures for financial instruments: • Equity and Fixed Maturity Investments: As of June 30, 2017 , the Company's Level 3 equity securities consisted primarily of privately placed warrants of companies that have publicly traded common stock. The fair value of these equity securities as of June 30, 2017 was derived from the quoted price of the underlying common stock adjusted for other inputs that are not market observable. • Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, and Short Term Investments: The carrying value of cash and cash equivalents, restricted cash and cash equivalents, and short term investments approximate their respective fair value and are classified as Level 1 in the fair value hierarchy. • Premiums Receivable, Accrued Interest, Reinsurance Recoverables: The carrying values reported in the accompanying balance sheets for these financial instruments approximate their fair values due to the short term nature of the asset and are classified as Level 1 in the financial hierarchy. • Equity Investment in Unconsolidated Subsidiaries - Related Party: In June 2017, the Company sold 10,586 common shares of NGHC. As a result of the sale, the Company ceased accounting for this investment under the equity method and has classified its remaining $36,069 investment in NGHC common stock as equity securities, available-for-sale. Refer to Notes 3 and 10 for more information. • Subordinated Debentures and Debt: The fair value of the Company's debt arrangements as of June 30, 2017 was as follows: Carrying Value Fair Value 6.125% Notes due 2023 $ 248,322 $ 246,684 2.75% Convertible senior notes due 2044 169,615 176,132 7.25% Subordinated Notes due 2055 145,265 150,120 7.50% Subordinated Notes due 2055 130,739 137,268 Revolving credit facility 130,000 130,000 Junior subordinated debentures due 2035-2037 122,072 98,600 Trust preferred securities due 2033-2037 92,786 85,811 Republic promissory note 52,343 53,484 Other 193,487 193,487 Total $ 1,284,629 $ 1,271,586 The 7.25% subordinated notes due 2055, the 7.50% subordinated notes due 2055, the 2.75% convertible senior notes due 2044, and the 6.125% notes due 2023 are publicly traded instruments and are classified as Level 1 in the fair value hierarchy. The fair value of the junior subordinated debentures due 2035-2037 and trust preferred securities due 2033-2037 were determined using the Black-Derman-Toy interest rate lattice model and are classified as Level 3 in the fair value hierarchy. In determining the fair value of its remaining debt, the Company uses estimates based on rates currently available to the Company for debt with similar terms and remaining maturities. Accordingly, the fair value of the Republic promissory note and other debt is classified as Level 2 within the valuation hierarchy. The Company considers its other debt's carrying value to approximate fair value as their interest rates approximate current borrowing rates. • Contingent consideration: The fair value of contingent consideration is based on a discounted cash flow methodology and is classified as Level 3 in the fair value hierarchy. The range of discount rates used for contingent consideration was primarily between 8% and 30% . • Life settlement contracts and life settlement contract profit commission: Life settlement contracts are described in Note 5. "Investments in Life Settlements" elsewhere in this report. The fair value of life settlement contracts as well as life settlement profit commission liability is based on information available to the Company at the end of the reporting period. These financial instruments are classified as Level 3 in the fair value hierarchy. The Company considers the following factors in its fair value estimates: cost at date of purchase, recent purchases and sales of similar investments (if available and applicable), financial standing of the issuer, changes in economic conditions affecting the issuer, maintenance cost, premiums, benefits, standard actuarially developed mortality tables and life expectancy reports prepared by nationally recognized and independent third party medical underwriters. The Company estimates the fair value of policies in the portfolio based on the expected cash flow to be generated by the policies (death benefit less premium payments), discounted to reflect the cost of funding, policy specific adjustments and reserves. In order to confirm the integrity of their calculation of fair value, the Company, quarterly, retains an independent third-party actuary to verify that the actuarial modeling used by the Company to determine fair value was performed correctly and that the valuation, as determined through the Company's actuarial modeling, is consistent with other methodologies. The Company considers this information in its assessment of the reasonableness of the life expectancy and discount rate inputs used in the valuation of these investments. The Company adjusts the standard mortality for each insured for the insured's life expectancy based on reviews of the insured's medical records and the independent life expectancy reports based thereon. The Company establishes policy specific reserves for the following uncertainties: improvements in mortality, the possibility that the high net worth individuals represented in its portfolio may have access to better health care, the volatility inherent in determining the life expectancy of insureds with significant reported health impairments, and the future expenses related to the administration of the portfolio, which incorporates current life expectancy assumptions, premium payments, the credit exposure to the insurance company that issued the life settlement contracts and the rate of return that a buyer would require on the contracts as no comparable market pricing is available. The application of the investment discount rate to the expected cash flow generated by the portfolio, net of the policy specific reserves, yields the fair value of the portfolio. The effective discount rate reflects the relationship between the fair value and the expected cash flow gross of these reserves. The following summarizes data utilized in estimating the fair value of the portfolio of life insurance policies as of June 30, 2017 and December 31, 2016 , and only includes data for policies to which the Company assigned value at those dates: June 30, December 31, Average age of insured (years) 83.0 82.8 Average life expectancy, months (1) 103 107 Average face amount per policy $ 6,658 $ 6,572 Effective discount rate (2) 13.0 % 12.4 % (1) Standard life expectancy as adjusted for specific circumstances. (2) Effective discount rate ("EDR") is the Company's estimated internal rate of return on its life settlement contract portfolio and is determined from the gross expected cash flows and valuation of the portfolio. The EDR is inclusive of the reserves and the gross expected cash flows of the portfolio. The Company anticipates that the EDR's range is between 12.5% and 17.5% and reflects the uncertainty that exists surrounding the information available as of the reporting date. As the accuracy and reliability of information improves (declines), the EDR will decrease (increase). The Company's assumptions are, by their nature, inherently uncertain and the effect of changes in estimates may be significant. The fair value measurements used in estimating the present value calculation are derived from valuation techniques generally used in the industry that include inputs for the asset that are not based on observable market data. The extent to which the fair value could reasonably vary in the near term has been quantified by evaluating the effect of changes in significant underlying assumptions used to estimate the fair value amount. If the life expectancies were increased or decreased by 4 months and the discount factors were increased or decreased by 1% while all other variables were held constant, the carrying value of the investment in life insurance policies would increase or (decrease) by the unaudited amounts summarized below as of June 30, 2017 and December 31, 2016 : Change in life expectancy Plus 4 Months Minus 4 Months Investment in life policies: June 30, 2017 $ (47,918 ) $ 47,529 December 31, 2016 $ (44,207 ) $ 43,492 Change in discount rate (1) Plus 1% Minus 1% Investment in life policies: June 30, 2017 $ (32,702 ) $ 36,213 December 31, 2016 $ (29,881 ) $ 33,155 (1) Discount rate is a present value calculation that considers legal risk, credit risk and liquidity risk and is a component of EDR.

Investment in Life Settlements

Investment in Life Settlements	6 Months Ended
	Jun. 30, 2017
Investments, All Other Investments [Abstract]
Investment in Life Settlements	Investment in Life Settlements The Company has a 50% ownership interest in each of two entities (collectively, the "LSC Entities") formed for the purpose of acquiring life settlement contracts, with a subsidiary of NGHC owning the remaining 50% . The LSC Entities are: Tiger Capital LLC (“Tiger”); and AMT Capital Holdings, S.A. (“AMTCH”). Capital contributions of $7,000 and $27,000 were made to the LSC Entities during the three and six months ended June 30, 2017 , respectively. Capital contributions of $11,000 were made to the LSC Entities during the three months and six ended June 30, 2016. The Company contributed 50% of these capital contributions. The Company recorded a loss of $1,261 and a gain of $12,676 on investment in life settlement contracts, net of profit commission, for the three months ended June 30, 2017 and 2016, respectively, and a gain of $7,349 and $23,406 for the six months ended June 30, 2017 and 2016. The following tables describe the Company’s investment in life settlements as of June 30, 2017 and December 31, 2016 : Expected Maturity Term in Years Number of Life Settlement Contracts (in whole numbers) Fair Value (1) Face Value As of June 30, 2017 0-1 — $ — $ — 1-2 1 1,935 2,500 2-3 9 46,545 90,422 3-4 10 34,553 81,000 4-5 14 38,547 85,900 Thereafter 224 275,202 1,437,413 Total 258 $ 396,782 $ 1,697,235 Expected Maturity Term in Years Number of Life Settlement Contracts (in whole numbers) Fair Value (1) Face Value As of December 31, 2016 0-1 — $ — $ — 1-2 2 8,873 12,500 2-3 7 39,495 63,000 3-4 10 37,436 75,422 4-5 10 34,003 82,900 Thereafter 225 237,049 1,405,414 Total 254 $ 356,856 $ 1,639,236 (1) As of June 30, 2017 and December 31, 2016 , the Company determined the fair value of 10 and 18 policies, respectively, to be negative and, therefore, assigned a fair value of zero to those policies. For these contracts, the table below details the amount of premiums paid and the death benefits received during the twelve months preceding June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 Number of policies with a negative value from discounted cash flow model as of period end (in whole numbers) 10 18 Premiums paid for the preceding twelve month period for period ended $ 974 $ 2,640 Death benefit received $ — $ — Premiums to be paid by the LSC Entities for each of the five succeeding fiscal years to keep the life insurance policies in force as of June 30, 2017 , are as follows: Premiums Due on Life Settlement Contracts 2017 $ 51,704 2018 53,042 2019 51,922 2020 47,867 2021 46,039 Thereafter 509,478 Total $ 760,052 For additional information relating to the accounting for life settlement contracts, see Note 7 to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

Loss and loss adjustment expens

Loss and loss adjustment expense reserves	6 Months Ended
	Jun. 30, 2017
Insurance [Abstract]
Loss and loss adjustment expense reserves	Loss and Loss Adjustment Expense Reserves The following table provides a reconciliation of the beginning and ending balances for loss and loss adjustment expense reserves ("Loss and LAE") for the three months ended June 30, 2017 , and 2016 , respectively: 2017 2016 Loss and LAE, gross of related reinsurance recoverables at beginning of period $ 10,630,162 $ 7,516,089 Less: Reinsurance recoverables at beginning of period 4,042,932 2,731,397 Net balance, beginning of period 6,587,230 4,784,692 Incurred related to: Current year 951,409 758,212 Prior year 73,069 26,181 Total incurred during the period 1,024,478 784,393 Paid related to: Current year (230,377 ) (174,915 ) Prior year (535,417 ) (468,347 ) Total paid during the period (765,794 ) (643,262 ) Loss portfolio transfers — 143,667 Acquired loss and loss adjustment reserves — 463,115 Retroactive reinsurance adjustment (698,069 ) — Effect of foreign exchange rates 59,522 (4,060 ) Net balance, end of period 6,207,367 5,528,545 Plus reinsurance recoverables at end of period 4,942,144 3,568,863 Loss and LAE, gross of related reinsurance recoverables at end of period $ 11,149,511 $ 9,097,408 The following table provides a reconciliation of the beginning and ending balances for Loss and LAE for the six months ended June 30, 2017 , and 2016 , respectively: 2017 2016 Loss and LAE, gross of related reinsurance recoverables at beginning of period $ 10,140,716 $ 7,208,367 Less: Reinsurance recoverables at beginning of period 3,873,786 2,665,187 Net balance, beginning of period 6,266,930 4,543,180 Incurred related to: Current year 1,772,892 1,397,334 Prior year 91,920 102,132 Total incurred during the period 1,864,812 1,499,466 Paid related to: Current year (366,242 ) (268,779 ) Prior year (1,148,277 ) (947,334 ) Total paid during the period (1,514,519 ) (1,216,113 ) Loss portfolio transfers — 312,049 Acquired loss and loss adjustment reserves 200,802 463,115 Retroactive reinsurance adjustment (698,069 ) — Effect of foreign exchange rates 87,411 (73,152 ) Net balance, end of period 6,207,367 5,528,545 Plus reinsurance recoverables at end of period 4,942,144 3,568,863 Loss and LAE, gross of related reinsurance recoverables at end of period $ 11,149,511 $ 9,097,408 In setting its reserves, the Company utilizes a combination of Company loss development factors and industry-wide loss development factors. In the event that the Company’s losses develop more favorably (adversely) than the industry, as a whole, the Company’s liabilities for unpaid losses and LAE may decrease (increase). The Company's management believes that its use of both its historical experience and industry-wide loss development factors provide a reasonable basis for estimating future losses. In either case, future events beyond the control of management, such as changes in law, judicial interpretations of law, and inflation may favorably or unfavorably impact the ultimate settlement of the Company’s Loss and LAE reserves. The anticipated effect of inflation is implicitly considered when estimating liabilities for losses and LAE. While the Company considers anticipated changes in claim costs due to inflation in estimating the ultimate claim costs, the increase in average severity of claims is caused by a number of factors that vary with the individual type of policy written. The Company projects future average severities based on historical trends adjusted for implemented changes in underwriting standards, policy provisions, and general economic trends. The Company monitors those anticipated trends based on actual development and makes modifications, if necessary. The Company's Loss and LAE, gross of related reinsurance recoverables, increased $519,349 and $1,581,319 , respectively, during the three months ended June 30, 2017 and 2016 , and $1,008,795 and $1,889,041 , respectively, during the six months ended June 30, 2017 and 2016. The increase in 2017 primarily related to the acquisition of AmeriHealth Casualty Insurance Company and increased premium writings. The Company had adverse prior period reserve development of $73,069 and $91,920 , respectively, during the three and six months ended June 30, 2017 . The adverse reserve development was primarily driven by large loss activity in our workers' compensation business primarily within the Small Commercial Business segment as well as higher than expected losses within the workers' compensation and general liability programs within the Specialty Program segment. The increase in 2016 related primarily to increased premium writings, and a loss portfolio transfer. The Company's liabilities for unpaid losses and LAE attributable to prior years increased $26,181 and $102,132 , respectively, for the three and six months ended June 30, 2016 , primarily due to adverse loss experience in the Company's Specialty Program segment's general liability and auto liability portfolios, and the Company's Small Commercial Business segment's auto liability portfolio.

Debt

Debt	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt	Debt The Company’s outstanding debt consisted of the following at June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 6.125% Notes due 2023 (the "2023 Notes") $ 248,322 $ 248,185 Secured loan agreements 174,136 75,762 2.75% Convertible senior notes due 2044 (the "2044 Notes") 169,615 166,387 7.25% Subordinated notes due 2055 (the "7.25% 2055 Notes") 145,265 145,202 7.50% Subordinated notes due 2055 (the "7.50% 2055 Notes") 130,739 130,684 Revolving credit facility 130,000 130,000 Junior subordinated debentures (the "2035-2037 Notes") 122,072 122,028 Trust preferred securities (the "2033-2037 TPS Notes") 92,786 92,786 Promissory notes 66,402 118,643 5.5% Convertible senior notes due 2021 (the "2021 Notes") 5,292 5,223 $ 1,284,629 $ 1,234,900 Additionally, the Company utilizes various letters of credit in its operations. The following is a summary of the Company's letters of credit as of June 30, 2017 : Limit Outstanding Available Revolving credit facility $ 175,000 $ 174,267 $ 733 Funds at Lloyd's facility 670,942 647,889 23,053 ING Bank N.V., BHF-BANK Aktiengesellschaft, and Deutsche Bank Netherlands N.V. facilities 87,715 68,724 18,991 Comerica bank letters of credit 75,000 53,067 21,933 UniCredit Bank 100,000 100,000 — Other letters of credit, in aggregate 102,857 102,857 — Interest expense, including amortization of original issue discount and deferred origination costs, as well as applicable bank fees, related to the Company's outstanding debt and letters of credit for the three and six months ended June 30, 2017 and 2016 was: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Revolving credit facility $ 1,529 $ 1,098 $ 3,039 $ 2,254 2021 Notes 117 114 234 229 2044 Notes 3,224 3,116 6,449 6,232 2023 Notes 3,896 3,896 7,793 7,793 2035-2037 Notes 1,420 1,546 2,888 3,061 2033-2037 TPS Notes 1,078 769 2,109 769 7.25% 2055 Notes 2,750 2,750 5,500 5,500 7.50% 2055 Notes 2,559 2,559 5,118 5,118 Secured loan agreements 1,493 178 2,827 367 Promissory notes 1,045 1,397 2,708 1,555 Funds at Lloyd's facility 1,236 1,123 2,715 2,322 Other, including interest income 3,882 (634 ) 6,450 (1,414 ) Total $ 24,229 $ 17,912 $ 47,830 $ 33,786 Secured loan agreements On January 12, 2017, the Company, through three wholly-owned subsidiaries, entered into a ten -year secured loan agreement with Teachers Insurance and Annuity Association of America in the aggregate amount of £73,500 (or $97,079 as of June 30, 2017 ) to finance the purchase of a commercial office building in London, England. The loan bears interest at an annual rate of 3.45% and matures on January 15, 2027 . The loan requires quarterly interest payments for the term of the loan, with the principal and any accrued interest to be paid at maturity. On February 24, 2017, the Company, through a wholly-owned subsidiary, entered into a ten -year secured loan agreement with Citigroup Global Markets Realty Corp. ("Citigroup") in the aggregate amount of $11,350 to finance the purchase of a commercial office building in Alpharetta, Georgia. The loan bears interest at an annual rate of 4.67% and matures on March 6, 2027 . The loan requires monthly interest only payments through March 6, 2019, principal and interest payments of approximately $64 through February 6, 2027, with any remaining principal and accrued interest to be paid at maturity. Promissory Notes On April 18, 2016, in connection with the acquisition of Republic Companies, Inc. and its affiliates ("Republic"), the Company issued a $104,685 term promissory note to Delek Finance U.S. Inc. (subsequently assigned to Delek Group, Ltd.) as part of the consideration. The principal was to be paid in four equal installments on each of the first four anniversaries of the issuance date. The Company made the first principal payment of approximately $26,171 on March 30, 2017 and prepaid the second principal payment of approximately $25,910 (representing 99% of the principal payment due in April 2018) on June 29, 2017 . The parties agreed that the June 29, 2017 prepayment would satisfy in full the April 2018 principal payment. The remaining principal is payable in two equal installments on each of the third and fourth anniversaries of the issuance date.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table is a summary of the elements used in calculating basic and diluted earnings per share for the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 As restated As restated Numerator: Net income attributable to AmTrust common stockholders $ 5,829 $ 127,156 $ 28,461 $ 211,134 Denominator: Weighted average common shares outstanding – basic 180,679 173,182 175,799 174,346 Plus: Dilutive effect of stock options, convertible debt, other 849 1,865 1,115 1,881 Weighted average common shares outstanding – dilutive 181,528 175,047 176,914 176,227 Net income per AmTrust common share - basic $ 0.03 $ 0.73 $ 0.16 $ 1.21 Net income per AmTrust common share – diluted $ 0.03 $ 0.73 $ 0.16 $ 1.20 The Company's anti-dilutive securities excluded from diluted earnings per share calculation were immaterial for the three and six months ended June 30, 2017 and 2016 , respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes As of June 30, 2017 , the Company has U.S. Net Operating Losses ("NOLs") of $26,397 that expire beginning in 2019 through 2036 . In addition, these NOLs are subject to certain limitations under Section 382 of the Internal Revenue Code due to changes in ownership of $11,048 per year. The Company also has foreign NOLs of $837,227 , the majority of which have no expiration. The Company’s management believes that as of June 30, 2017 , except for a portion of foreign NOLs, it will realize the benefits of its deferred tax assets. As a result, the Company recorded a valuation allowance of $147,774 and $142,462 as of June 30, 2017 and December 31, 2016 , respectively. The increase in the valuation allowance from December 31, 2016 to June 30, 2017 was primarily due to the increase of gross NOLs in Luxembourg, which required a full valuation allowance. For additional information relating to Income Taxes, see Note 20 to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has various reinsurance and service agreements with Maiden Holdings, Ltd. ("Maiden") and ACP Re, Ltd. There have been no material changes to these agreements during the six months ended June 30, 2017. For more information related to these agreements, please see Note 17 to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016. Significant Transactions with National General Holding Corp. NGHC is a publicly-held specialty personal lines insurance holding company (Nasdaq: NGHC) that operates twenty-two insurance companies in the United States and provides a variety of insurance products, including personal and commercial automobile, homeowners and umbrella, and supplemental health. NGHC's two largest stockholders are the Michael Karfunkel Family 2005 Trust (the "Trust") and a grantor retained annuity trust controlled by Leah Karfunkel. Leah Karfunkel, who is co-trustee of the Trust along with Barry Zyskind, is a member of the Company’s board of directors, and the mother-in-law of Barry Zyskind, the Company’s Chairman, Chief Executive Officer and President. The ultimate beneficiaries of the Trust include Leah Karfunkel’s children, one of whom is married to Mr. Zyskind. In addition, Barry Karfunkel, the son of Leah Karfunkel and brother-in-law of Barry Zyskind, is the chief executive officer of NGHC and Barry Zyskind is NGHC’s non-executive chairman of the board. In accordance with ASC 323-10-15, Investments-Equity Method and Joint Ventures , the Company historically accounted for its investment in NGHC under the equity method as it had the ability to exert significant influence on NGHC's operations. During the three months ended June 30, 2017 and 2016, the Company recorded $1,106 and $4,802 of income, respectively, and $5,063 and $10,578 of income during the six months ended June 30, 2017 and 2016, respectively, related to its investment in NGHC under the equity method of accounting. On June 9, 2017 , the Company announced that it entered into agreements to sell 10,586 common shares of NGHC at a price of $20.00 per share (representing a discount of 8.3% to NGHC's common stock closing market price on the Nasdaq Stock Exchange on June 8, 2017 ). The sale was completed through separate, privately negotiated purchase agreements with unaffiliated third parties and resulted in a $68,425 realized gain, which is reflected in the Equity in earnings of unconsolidated subsidiaries - related parties caption on the Consolidated Statements of Income. As a result of the transaction, the Company's ownership interest in NGHC decreased from approximately 11.5% to approximately 1.6% . As a result of the aforementioned sale of NGHC common shares, the Company determined the fair value of its 1,709 remaining shares of NGHC common stock was not material to the Company's total assets or equity securities, available-for-sale, nor was the on-going income derived from the equity method accounting material to the Company's consolidated results of operations. Consequently, the Company ceased to account for its investment in NGHC under the equity method; rather, the Company classified the investment as a component of equity securities, available-for-sale on its consolidated balance sheets. $300,000 Private Placement As previously announced, the Company issued 24,096 shares of common stock at a price of $12.45 per share (the closing market price of the Company’s common stock on May 25, 2017 ), resulting in gross proceeds to the Company of $300,000 through a private placement ("Private Placement"). The Company contributed the proceeds from the Private Placement to the Company's insurance subsidiaries to support their financial strength, continued organic growth, and writing of business. Certain members of the families of each of George Karfunkel, a director of the company, Leah Karfunkel and Barry Zyskind were the sole purchasers in the Private Placement. The purchasers received unregistered common shares in AmTrust, as well as certain rights to register the shares at a future date. Additionally, the purchasers agreed not to transfer the common stock, subject to certain limited exceptions for bona fide estate planning purposes, for a period of one-year from the date of purchase and not to exercise their right to vote their shares of common stock until after the conclusion of the Company's 2018 annual meeting of shareholders.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions AmeriHealth Casualty Insurance Company On February 28, 2017, the Company completed its previously announced acquisition of AmeriHealth Casualty Insurance Company ("AmeriHealth Casualty"), a workers’ compensation insurance company operating primarily in Pennsylvania and New Jersey. The Company acquired 100% of the outstanding stock of AmeriHealth Casualty for approximately $92,786 in cash, which is subject to a reserve guarantee of approximately $40,000 , subject to a 10% loss corridor retained by the Company and payable after five years, based on the development of AmeriHealth Casualty’s loss reserves as of June 30, 2016. As of June 30, 2017, the Company had recorded $37,900 related to the reserve guarantee. A summary of the preliminary assets acquired and liabilities assumed for AmeriHealth Casualty are as follows: Assets Cash and investments $ 275,351 Premium receivable 45,288 Accrued interest and dividends 1,162 Reinsurance recoverable 14,512 Other assets 43,696 Goodwill and intangible assets 17,509 Total assets $ 397,518 Liabilities Loss and loss adjustment expense reserves $ 227,865 Unearned premiums 49,284 Accrued expenses and other liabilities 27,583 Total liabilities $ 304,732 Acquisition price $ 92,786 The goodwill and intangible assets, as well as AmeriHealth Casualty's results of operations, are included as a component of the Small Commercial Business segment. The goodwill is not expected to be deductible for income tax purposes. The intangible assets consist primarily of licenses and agent relationships. As a result of this acquisition, the Company recorded approximately $56,438 of gross written premium during the six months ended June 30, 2017 . PDP Group, Inc. On May 1, 2017 , the Company acquired 100% of the outstanding common stock of PDP Group Inc. ("PDP"), a Maryland-based provider of tailored insurance solutions for auto dealers in North America. The purchase agreement required the Company to pay approximately $49,801 in cash on the acquisition date and contained an earn-out provision that is contingent on PDP meeting certain performance conditions over a three-year period. The Company valued the contingent consideration associated with the earn-out provision at $12,621 as of the acquisition date. A summary of the preliminary assets acquired and liabilities assumed for PDP are as follows: Assets Cash and investments $ 11,826 Premium receivable 29,188 Other assets 705 Property and equipment 776 Goodwill and intangible assets 55,586 Total assets $ 98,081 Liabilities Accrued expenses and other liabilities $ 35,659 Total liabilities $ 35,659 Acquisition price $ 62,422 The goodwill and intangible assets, as well as PDP's results of operations, are included as a component of the Specialty Risk and Extended Warranty segment. The goodwill is not expected to be deductible for income tax purposes. As a result of this acquisition, the Company recorded approximately $7,652 in service and fee income related to PDP during the three and six months ended June 30, 2017 . Other In addition, the Company completed other immaterial acquisitions during the six months ended June 30, 2017 . No individual acquisition was significant and, therefore, the Company did not include any pro forma financial information related to those acquisitions in this report. Total purchase consideration paid for those immaterial acquisitions was approximately $36,936 in cash and $8,129 in contingent consideration. As of June 30, 2017 , the purchase price allocation accounting has not yet been finalized with respect to these immaterial acquisitions.

Shareholder Equity and Accumula

Shareholder Equity and Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Shareholder's Equity and Accumulated Other Comprehensive Income (Loss)	Stockholder's Equity and Accumulated Other Comprehensive Income (Loss) Stockholders' Equity The following table summarizes the ownership components of total stockholders' equity: Six Months Ended June 30, 2017 2016 AmTrust Non-Controlling Interest Total AmTrust Non-Controlling Interest Total (As restated) (As restated) Balance, December 31, $ 3,269,103 $ 196,510 $ 3,465,613 $ 2,723,780 $ 176,455 $ 2,900,235 Net income 61,603 17,148 78,751 231,501 9,493 240,994 Unrealized holding gain 75,099 — 75,099 191,347 — 191,347 Reclassification adjustment (30,858 ) — (30,858 ) (8,045 ) — (8,045 ) Foreign currency translation 76,526 — 76,526 (80,007 ) — (80,007 ) Unrealized gain on interest rate swap 120 — 120 287 — 287 Share exercises, compensation and other 9,662 — 9,662 4,421 — 4,421 Common stock issuance 298,747 — 298,747 — — — Common share purchase, net — — — (103,164 ) — (103,164 ) Common stock dividends (63,342 ) — (63,342 ) (52,189 ) (10,229 ) (62,418 ) Preferred stock issuance, net of fees — — — 139,070 — 139,070 Preferred stock dividends (33,142 ) — (33,142 ) (20,367 ) — (20,367 ) Capital contribution, net — 19,298 19,298 — 5,500 5,500 Balance, June 30, $ 3,663,518 $ 232,956 $ 3,896,474 $ 3,026,634 $ 181,219 $ 3,207,853 During the six months ended June 30, 2017 , net income attributable to non-controlling interest was $17,148 , and net income attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries totaled $17,728 . During the six months ended June 30, 2016 , net income attributable to non-controlling interest was $9,493 , and net income attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries was $9,834 . Accumulated Other Comprehensive Income (Loss) The following table summarizes the activities and components of accumulated other comprehensive income (loss): Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive Income (Loss) Balance, March 31, 2017 $ (174,340 ) $ 79,791 $ (80 ) $ (3,177 ) $ (97,806 ) Other comprehensive income (loss) before reclassification 62,663 66,029 28 — 128,720 Amounts reclassed from accumulated other comprehensive income (loss) — (19,228 ) — — (19,228 ) Income tax (expense) — (16,521 ) — — (16,521 ) Net current-period other comprehensive income (loss) 62,663 30,280 28 — 92,971 Balance, June 30, 2017 $ (111,677 ) $ 110,071 $ (52 ) $ (3,177 ) $ (4,835 ) Balance, March 31, 2016 (As restated) $ (145,268 ) $ 48,035 $ (581 ) $ (107 ) $ (97,921 ) Other comprehensive income (loss) before reclassification (32,809 ) 158,930 258 — 126,379 Amounts reclassed from accumulated other comprehensive income (loss) — (3,920 ) — — (3,920 ) Income tax (expense) — (54,254 ) (90 ) — (54,344 ) Net current-period other comprehensive income (32,809 ) 100,756 168 — 68,115 Balance, June 30, 2016 (As restated) $ (178,077 ) $ 148,791 $ (413 ) $ (107 ) $ (29,806 ) Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive Income (Loss) Balance, December 31, 2016 $ (188,203 ) $ 65,830 $ (172 ) $ (3,177 ) $ (125,722 ) Other comprehensive income before reclassification 76,526 98,060 120 — 174,706 Amounts reclassed from accumulated other comprehensive income (loss) — (30,858 ) — — (30,858 ) Income tax benefit (expense) — (22,961 ) — — (22,961 ) Net current-period other comprehensive income 76,526 44,241 120 — 120,887 Balance, June 30, 2017 $ (111,677 ) $ 110,071 $ (52 ) $ (3,177 ) $ (4,835 ) Balance, December 31, 2015 (As restated) $ (98,074 ) $ (34,511 ) $ (700 ) $ (107 ) $ (133,392 ) Other comprehensive income (loss) before reclassification (80,003 ) 286,588 441 — 207,026 Amounts reclassed from accumulated other comprehensive (loss) — (4,578 ) — — (4,578 ) Income tax benefit (expense) — (98,708 ) (154 ) — (98,862 ) Net current-period other comprehensive (loss) income (80,003 ) 183,302 287 — 103,586 Balance, June 30, 2016 (As restated) $ (178,077 ) $ 148,791 $ (413 ) $ (107 ) $ (29,806 )

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation The Company’s insurance subsidiaries are named as defendants in various legal actions arising principally from claims made under insurance policies and contracts. Those actions are considered by the Company in estimating the loss and LAE reserves. The Company’s management believes the resolution of those actions will not have a material adverse effect on the Company’s financial position or results of operations. On April 7, 2015, one of the Company's stockholders, Cambridge Retirement System, filed a derivative action in the Court of Chancery of the State of Delaware against the Company, as nominal defendant, and against the Company's board of directors, Leah Karfunkel, and ACP Re, as defendants. Cambridge amended its complaint on November 3, 2015 to add NGHC as a defendant. The stockholder purports to bring the derivative action on the Company's behalf, alleging breaches of the duties of loyalty and care on the part of the Company's directors and majority shareholders related to the Company's transactions involving Tower Group International, Ltd. Cambridge's claim against NGHC and ACP Re is for unjust enrichment. The amended complaint seeks damages, disgorgement and reform of the Company's governance practices. The Company believe the allegations in this action to be unfounded and will vigorously pursue its defenses. On April 27, 2017, one of the Company's stockholders, David Shaev Profit Sharing Plan, filed a derivative action in the Supreme Court of the State of New York for the County of New York ( Shaev v. DeCarlo et al. ). Three derivative suits have also been filed in the United States District Court for the District of Delaware. On April 19, 2017, one of the Company's stockholders, Lily Ding, filed a derivative action in the District of Delaware against the Company, as nominal defendant, and against the Company's board of directors as defendants, but this stockholder subsequently voluntarily dismissed her suit ( Ding v. Zyskind et al .). On May 11, 2017, one of the Company's stockholders, West Palm Beach Police Pension Fund, filed suit ( West Palm Beach Police Pension Fund v. Zyskind et al .), and on June 28, 2017, two of the Company's stockholders, City of Lauderhill Police Officers Retirement Plan and Pompano Beach Police & Firefighters Retirement System, filed suit ( City of Lauderhill Police Officers Retirement Plan and Pompano Beach Police & Firefighters Retirement System et al. v. Zyskind et al .). These two Delaware derivative actions ( West Palm Beach Police Pension Fund and Lauderhill-Pompano Beach ) have been consolidated under the case name In re AmTrust Financial Services, Inc. Derivative Litigation . The stockholders purport to bring the derivative actions on the Company's behalf, and raise claims that primarily involve the Company's recent restatement of its financial statements and the identification of material weaknesses in its internal control over financial reporting. The In re AmTrust Derivative Litigation complaint alleges violations of Sections 10(b), 14(a), 20A, and 29(b) of the Exchange Act, breaches of fiduciary duties, unjust enrichment, and waste of corporate assets. The In re AmTrust Derivative Litigation complaint also seeks reform of the Company's governance practices, contribution and indemnification, and both sets of stockholders seek damages. The Company believes the allegations in these pending derivative actions to be unfounded and will vigorously pursue its defenses. The Company and certain of its officers and directors are also defendants in three putative securities class action lawsuits filed in March and April of 2017 in the United States District Court for the Southern District of New York. Another putative class action, filed in February 2017 in the United States District Court for the Central District of California, was voluntarily dismissed ( Miller v. AmTrust, Zyskind, and Pipoly ). The three cases in the Southern District of New York have been consolidated under the case name In re AmTrust Financial Services, Inc. Securities Litigation , and a consolidated amended complaint will be filed on or by August 18, 2017 . Plaintiffs in two of the three consolidated lawsuits purport to represent a class of the Company's stockholders who purchased shares between March 2015 and March 2017 ( Rubel v. AmTrust, Zyskind, and Pipoly ; Sachetti v. AmTrust, Zyskind, and Pipoly ). The complaints assert claims under Sections 10(b) and 20(a) of the Exchange Act, and Rule 10b-5 promulgated thereunder. Plaintiffs in the third consolidated lawsuit purport to represent a class of purchasers of the Company's common stock purchased in a November 12, 2015 offering ( Albano v. AmTrust Financial Services, Inc. et al. ). This complaint asserts claims under Sections 11 and 15 of the Securities Act of 1933, as amended. The plaintiffs in all three consolidated actions seek an unspecified amount in damages, attorneys’ fees, and other relief. The Company believes the allegations to be unfounded and will vigorously pursue its defenses; however, the Company cannot reasonably estimate the potential range of loss, if any, due to the early stage of the proceedings. Additionally, in April, May, and June, 2017, the Company received four demands for the inspection of books and records pursuant to Section 220 of the Delaware General Corporation Law, from stockholders Rikhard Dauber, Pompano Beach Police & Firefighters Retirement System, Nestor Shust, and the City of Lauderhill Police Officers’ Retirement Plan. Other than as discussed above, the Company is not involved presently in any material litigation nor, to the Company’s knowledge, is any material litigation threatened against the Company or its properties.

Segments

Segments	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segments	Segments The Company operates three business segments: Small Commercial Business; Specialty Risk and Extended Warranty; and Specialty Program. The Corporate and Other segment also represents the activities of the holding company as well as a portion of service and fee revenue. Investment income and realized gains (losses) are determined by calculating an overall annual return on cash and invested assets and applying that overall return to the cash and invested assets by segment. Ceding commission is allocated to each segment based on that segment’s proportionate share of the Company’s overall acquisition costs. Interest expense is allocated based on gross written premium by segment. Income taxes are allocated on a pro-rata basis based on the Company’s effective tax rate. Additionally, management reviews the performance of underwriting income in assessing the performance of and making decisions regarding the allocation of resources to the segments. Underwriting income excludes, primarily, service and fee revenue, investment income and other revenues, other expenses, interest expense and income taxes. Management believes that providing this information in this manner is essential to providing the Company’s stockholders with an understanding of the Company’s business and operating performance. During the three and six months ended June 30, 2017, the Company did not have any segment derive over ten percent of its total revenue from one agent. During six months ended June 30, 2016 , the Company's Specialty Program segment derived over ten percent of its gross written premium primarily from one agent. The following tables summarize the results of operations of the business segments for the three and six months ended June 30, 2017 and 2016 : Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Three Months Ended June 30, 2017: Gross written premium $ 1,123,292 $ 795,932 $ 280,523 $ — $ 2,199,747 Revenues: Net written premium $ 638,762 $ 555,486 $ 177,654 $ — $ 1,371,902 Change in unearned premium (6,898 ) (16,483 ) 32,188 — 8,807 Net earned premium 631,864 539,003 209,842 — 1,380,709 Expenses: Loss and loss adjustment expense (466,901 ) (370,840 ) (186,737 ) — (1,024,478 ) Acquisition costs and other underwriting expenses (170,179 ) (140,310 ) (62,706 ) — (373,195 ) Total expenses (637,080 ) (511,150 ) (249,443 ) — (1,397,673 ) Underwriting (loss) income (5,216 ) 27,853 (39,601 ) — (16,964 ) Other income (loss) Service and fee income 30,990 98,178 443 38,835 168,446 Investment income and realized gain 32,519 27,719 12,443 — 72,681 Other expenses (51,496 ) (35,748 ) (12,686 ) (99,930 ) (199,860 ) Interest expense (12,403 ) (8,740 ) (3,086 ) — (24,229 ) Foreign currency loss — (58,948 ) — — (58,948 ) Loss on life settlement contracts (859 ) (268 ) (134 ) — (1,261 ) Benefit (provision) for income taxes 7,477 28,595 (281 ) (16,064 ) 19,727 Equity in earnings of unconsolidated subsidiary – related party — — — 69,531 69,531 Net income (loss) $ 1,012 $ 78,641 $ (42,902 ) $ (7,628 ) $ 29,123 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Three Months Ended June 30, 2016 Gross written premium $ 1,060,558 $ 651,561 $ 360,993 $ — $ 2,073,112 Revenues: Net written premium $ 601,638 $ 447,061 $ 219,737 $ — $ 1,268,436 Change in unearned premium (28,660 ) (89,177 ) 31,153 — (86,684 ) Net earned premium 572,978 357,884 250,890 — 1,181,752 Expenses: Loss and loss adjustment expense (382,950 ) (231,328 ) (170,115 ) — (784,393 ) Acquisition costs and other underwriting expenses (150,149 ) (78,773 ) (65,555 ) — (294,477 ) Total expenses (533,099 ) (310,101 ) (235,670 ) — (1,078,870 ) Underwriting income (As restated) 39,879 47,783 15,220 — 102,882 Other income (loss) Service and fee income (As restated) 25,745 69,155 1,228 28,178 124,306 Investment income and realized gain (loss) 28,193 19,506 18,211 (66 ) 65,844 Other expenses (As restated) (34,321 ) (21,154 ) (11,697 ) (67,172 ) (134,344 ) Interest expense (As restated) (9,180 ) (5,612 ) (3,120 ) — (17,912 ) Foreign currency loss (As restated) — (28,995 ) — — (28,995 ) Gain on life settlement contracts 6,507 3,961 2,208 — 12,676 (Loss) gain on acquisition (9,223 ) 48,320 — — 39,097 (Provision) benefit for income taxes (As restated) (6,256 ) (19,030 ) (3,184 ) 4,663 (23,807 ) Equity in earnings of unconsolidated subsidiary – related party — — — 4,802 4,802 Net income (loss) (As restated) $ 41,344 $ 113,934 $ 18,866 $ (29,595 ) $ 144,549 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Six Months Ended June 30, 2017 Gross written premium $ 2,380,577 $ 1,528,374 $ 557,076 $ — $ 4,466,027 Revenues: Net written premium $ 1,297,741 $ 1,065,694 $ 352,533 $ — $ 2,715,968 Change in unearned premium (112,252 ) (53,201 ) 52,726 — (112,727 ) Net earned premium 1,185,489 1,012,493 405,259 — 2,603,241 Expenses: Loss and loss adjustment expense (844,338 ) (683,444 ) (337,030 ) — (1,864,812 ) Acquisition costs and other underwriting expenses (324,820 ) (258,773 ) (117,817 ) — (701,410 ) Total expenses (1,169,158 ) (942,217 ) (454,847 ) — (2,566,222 ) Underwriting (loss) income 16,331 70,276 (49,588 ) — 37,019 Other income (loss) Service and fee income 59,644 185,119 1,980 59,199 305,942 Investment income and realized gain 62,209 53,847 28,565 — 144,621 Other expenses (96,670 ) (62,064 ) (22,622 ) (181,357 ) (362,713 ) Interest expense (25,496 ) (16,368 ) (5,966 ) — (47,830 ) Foreign currency loss — (76,916 ) — — (76,916 ) Gain on life settlement contracts 3,917 2,515 917 — 7,349 (Provision) benefit for income taxes (401 ) (3,147 ) 940 979 (1,629 ) Equity in earnings of unconsolidated subsidiary – related party — — — 73,488 73,488 Net income (loss) $ 19,534 $ 153,262 $ (45,774 ) $ (47,691 ) $ 79,331 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Six Months Ended June 30, 2016 Gross written premium $ 2,126,690 $ 1,181,007 $ 698,489 $ — $ 4,006,186 Revenues: Net written premium $ 1,226,166 $ 784,894 $ 478,055 $ — $ 2,489,115 Change in unearned premium (149,094 ) (105,169 ) 21,182 — (233,081 ) Net earned premium 1,077,072 679,725 499,237 — 2,256,034 Expenses: Loss and loss adjustment expense (715,634 ) (442,264 ) (341,568 ) — (1,499,466 ) Acquisition costs and other underwriting expenses (283,681 ) (151,624 ) (131,640 ) — (566,945 ) Total expenses (999,315 ) (593,888 ) (473,208 ) — (2,066,411 ) Underwriting income (As restated) 77,757 85,837 26,029 — 189,623 Other income (loss) Service and fee income (As restated) 58,282 143,539 1,517 49,773 253,111 Investment income and realized gain 55,047 38,676 29,511 — 123,234 Other expenses (As restated) (69,968 ) (38,856 ) (22,981 ) (131,806 ) (263,611 ) Interest expense (As restated) (17,935 ) (9,960 ) (5,891 ) — (33,786 ) Foreign currency loss (As restated) — (67,228 ) — — (67,228 ) Gain on life settlement contracts 12,425 6,900 4,081 — 23,406 Gain on acquisition 455 48,320 — — 48,775 (Provision) benefit for income taxes (As restated) (17,471 ) (31,195 ) (4,857 ) 10,756 (42,767 ) Equity in earnings of unconsolidated subsidiary – related party — — — 10,578 10,578 Net income (loss) (As restated) $ 98,592 $ 176,033 $ 27,409 $ (60,699 ) $ 241,335 The following tables summarize net earned premium by major line of business, by segment, for the three and six months ended June 30, 2017 and 2016 : Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended June 30, 2017: Workers' compensation $ 373,088 $ — $ 114,643 $ 487,731 Warranty — 255,794 16 255,810 Other liability — 46,198 52,131 98,329 Commercial auto and liability, physical damage 95,556 — 28,520 124,076 Medical malpractice — 53,874 — 53,874 Other 163,220 183,137 14,532 360,889 Total net earned premium $ 631,864 $ 539,003 $ 209,842 $ 1,380,709 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended June 30, 2016: Workers' compensation $ 358,894 $ — $ 199,704 $ 558,598 Warranty — 179,169 — 179,169 Other liability — 33,305 12,800 46,105 Commercial auto and liability, physical damage 111,992 8,684 30,602 151,278 Medical malpractice — 62,733 — 62,733 Other 102,092 73,993 7,784 183,869 Total net earned premium $ 572,978 $ 357,884 $ 250,890 $ 1,181,752 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Six Months Ended June 30, 2017: Workers' compensation $ 709,413 $ — $ 223,638 $ 933,051 Warranty — 470,321 19 470,340 Other liability — 89,507 106,670 196,177 Commercial auto and liability, physical damage 196,702 — 54,475 251,177 Medical malpractice — 106,653 — 106,653 Other 279,374 346,012 20,457 645,843 Total net earned premium $ 1,185,489 $ 1,012,493 $ 405,259 $ 2,603,241 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Six Months Ended June 30, 2016: Workers' compensation $ 704,937 $ — $ 307,417 $ 1,012,354 Warranty — 347,502 — 347,502 Other liability 5,249 74,018 83,381 162,648 Commercial auto and liability, physical damage 197,896 17,176 65,745 280,817 Medical malpractice — 106,750 — 106,750 Other 168,990 134,279 42,694 345,963 Total net earned premium $ 1,077,072 $ 679,725 $ 499,237 $ 2,256,034

Reinsurance Agreement

Reinsurance Agreement	6 Months Ended
	Jun. 30, 2017
Insurance [Abstract]
Reinsurance Agreement	Reinsurance Agreement Effective June 30, 2017 , the Company entered into an adverse loss development cover agreement (the "agreement"), with Premia Reinsurance Ltd. ("Premia"). Under the agreement, Premia will pay the Company for ultimate net losses paid by the Company in excess of a retention of $5,963,000 , subject to an aggregate limit of $1,025,000 , which provides $400,000 of coverage in excess of the Company’s carried loss reserves as of March 31, 2017 in the amount of approximately $6,590,000 . The consideration for this agreement is a $675,000 payment, plus an annual claims monitoring fee, of which $50,000 represents a payment for the coverage above the carried loss reserves of approximately $6,590,000 . The agreement has been accounted for as retroactive reinsurance, and resulted in a pre-tax loss of approximately $59,000 , including the $50,000 payment mentioned above and approximately $8,949 representing the net present value of the Company’s obligation to pay $1,000 annually in claims administration monitoring fees to Premia for up to 30 years. For the three month period ended June 30, 2017 , the Company recorded $73,069 of net adverse loss development, which exceeded the original pre-tax loss and resulted in a $14,120 deferred gain. The deferred gain will be recognized in earnings over the estimated claim settlement period. The consideration paid to Premia will be placed into a collateral trust account as security for Premia's claim payment obligations to the Company. Ceded reserves will be collateralized by the premium payment and all investment income will inure to the benefit of the collateral trust account. Premia will deposit an incremental $100,000 of excess collateral at inception and will also deposit incremental collateral in accordance with a pre-agreed schedule. The Company will pay interest deposited into the collateral trust account at a rate of 3.75% per annum on any unpaid portion of the $675,000 consideration amount from July 1, 2017 to the date of payment, which must occur within 180 days following June 30, 2017 . The Company will retain sole authority to handle and resolve claims, and Premia has various access, association and consultation rights.

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Estimated Market Value and Gross Unrealized Appreciation and Depreciation of Available-for-sale Securities	The cost or amortized cost, gross unrealized gains and losses, and estimated fair value of fixed maturity and equity securities classified as available-for-sale as of June 30, 2017 and December 31, 2016 , are presented below: Cost or amortized cost Gross unrealized gains Gross unrealized losses Fair Value Fixed Maturity Securities: U.S. treasury securities $ 356,281 $ 1,177 $ (1,711 ) $ 355,747 U.S. government agencies 13,762 41 (7 ) 13,796 Municipal bonds 925,039 15,092 (5,318 ) 934,813 Foreign government 190,445 4,238 (1,113 ) 193,570 Corporate bonds: Finance 1,554,129 44,021 (3,080 ) 1,595,070 Industrial 2,220,747 61,374 (8,288 ) 2,273,833 Utilities 369,235 10,948 (1,430 ) 378,753 Commercial mortgage-backed securities 474,262 4,594 (4,551 ) 474,305 Residential mortgage-backed securities: Agency backed 902,351 13,527 (6,099 ) 909,779 Non-agency backed 4,326 2 (95 ) 4,233 Collateralized loan / debt obligation 501,560 9,747 (385 ) 510,922 Asset backed securities 128,987 878 (127 ) 129,738 Total fixed maturity securities $ 7,641,124 $ 165,639 $ (32,204 ) $ 7,774,559 Equity Securities: Preferred stock $ 756 $ 21 $ — $ 777 Common stock 80,722 28,358 (1,027 ) 108,053 Total equity securities $ 81,478 $ 28,379 $ (1,027 ) $ 108,830 Cost or amortized cost Gross unrealized gains Gross unrealized losses Fair value Fixed Maturity Securities: U.S. treasury securities $ 331,036 $ 1,235 $ (1,617 ) $ 330,654 U.S. government agencies 63,467 282 (17 ) 63,732 Municipal bonds 860,444 9,603 (15,877 ) 854,170 Foreign government 149,365 4,237 (726 ) 152,876 Corporate bonds: Finance 1,535,606 38,404 (7,722 ) 1,566,288 Industrial 2,222,843 62,133 (17,115 ) 2,267,861 Utilities 195,607 4,433 (1,210 ) 198,830 Commercial mortgage backed securities 178,092 2,464 (2,562 ) 177,994 Residential mortgage backed securities: Agency backed 1,210,229 13,685 (13,529 ) 1,210,385 Non-agency backed 61,646 586 (1,003 ) 61,229 Collateralized loan / debt obligations 476,767 8,389 (751 ) 484,405 Asset backed securities 29,939 31 (260 ) 29,710 Total fixed maturity securities $ 7,315,041 $ 145,482 $ (62,389 ) $ 7,398,134 Equity Securities: Preferred stock $ 4,044 $ — $ (59 ) $ 3,985 Common stock 122,626 12,899 (2,348 ) 133,177 Total equity securities $ 126,670 $ 12,899 $ (2,407 ) $ 137,162
Amortized Cost, Estimated Market Value and Gross Unrealized Appreciation and Depreciation of Trading Securities	The original or amortized cost, estimated fair value and gross unrealized gains and losses of trading securities as of June 30, 2017 and December 31, 2016 are presented in the tables below: As of June 30, 2017 Original or amortized cost Gross unrealized gains Gross unrealized losses Fair value Fixed Maturity Securities Municipal bonds $ 837 $ — $ (8 ) $ 829 Corporate bonds: Industrial 27,325 140 (3,491 ) 23,974 Total Fixed Maturity Securities $ 28,162 $ 140 $ (3,499 ) $ 24,803 Common stock $ 92,700 $ 2,847 $ (10,973 ) $ 84,574 As of December 31, 2016 Original or amortized cost Gross unrealized gains Gross unrealized losses Fair value Fixed Maturity Securities Corporate bonds: Industrial $ 24,151 $ 4,379 $ — $ 28,530 Utilities 4,930 322 — 5,252 Total Fixed Maturity Securities $ 29,081 $ 4,701 $ — $ 33,782 Common stock $ 76,163 $ 9,842 $ (4,045 ) $ 81,960 The table below shows the portion of trading gains and losses for the period related to trading securities still held during the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net gains and losses recognized during the period on trading securities $ (11,980 ) $ (260 ) $ (15,240 ) $ 2,496 Less: Net gains and losses recognized during the period on trading securities sold during the period (2,065 ) 1,014 651 7,387 Unrealized gains and losses recognized during the reporting period on trading securities still held at the reporting date $ (9,915 ) $ (1,274 ) $ (15,891 ) $ (4,891 )
Summary of Available for Sale Fixed Securities by Contractual Maturity	A summary of the Company’s available-for-sale fixed maturity securities as of June 30, 2017 and December 31, 2016 , by contractual maturity, is shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2017 December 31, 2016 Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 265,819 $ 266,562 $ 319,275 $ 319,882 Due after one through five years 3,152,712 3,216,906 2,956,429 2,998,711 Due after five through ten years 1,737,598 1,780,579 1,645,211 1,683,112 Due after ten years 473,509 481,535 437,452 432,702 Mortgage and asset backed securities 2,011,486 2,028,977 1,956,674 1,963,727 Total fixed maturity securities $ 7,641,124 $ 7,774,559 $ 7,315,041 $ 7,398,134
Net Investment Income	Net investment income for the three and six months ended June 30, 2017 and 2016 was derived from the following sources: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Fixed maturity securities, available-for-sale $ 69,381 $ 46,235 $ 126,650 $ 92,428 Equity securities, available-for-sale 169 4,098 1,569 6,462 Fixed maturity securities, trading — — 1,032 — Equity securities, trading 2 (125 ) 20 (278 ) Cash and short term investments 1,888 686 3,282 1,772 Other invested assets (1) (19,240 ) — (15,001 ) — 52,200 50,894 117,552 100,384 Less: Investment expenses (2,974 ) (149 ) (5,001 ) (224 ) $ 49,226 $ 50,745 $ 112,551 $ 100,160 (1) Includes losses from equity method investments.
Summary of Gross Unrealized Losses of Fixed-maturities and Equity Securities	The tables below summarize the gross unrealized losses of our fixed maturity and equity securities by length of time the security has continuously been in an unrealized loss position as of June 30, 2017 and December 31, 2016 : Less Than 12 Months 12 Months or More Total As of June 30, 2017 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturity Securities: U.S. treasury securities $ 296,565 $ (1,709 ) $ 689 $ (2 ) $ 297,254 $ (1,711 ) U.S. government agencies 4,261 (7 ) — — 4,261 (7 ) Municipal bonds 382,730 (5,087 ) 8,526 (231 ) 391,256 (5,318 ) Foreign government 78,986 (1,046 ) 1,933 (67 ) 80,919 (1,113 ) Corporate bonds: Finance 295,860 (3,068 ) 4,032 (12 ) 299,892 (3,080 ) Industrial 459,696 (8,024 ) 11,821 (264 ) 471,517 (8,288 ) Utilities 79,036 (1,429 ) 507 (1 ) 79,543 (1,430 ) Commercial mortgage-backed securities 254,002 (4,118 ) 8,165 (433 ) 262,167 (4,551 ) Residential mortgage-backed securities: Agency backed 405,149 (6,038 ) 2,488 (61 ) 407,637 (6,099 ) Non-agency backed 1,569 (10 ) 2,539 (85 ) 4,108 (95 ) Collateralized loan / debt obligations 61,780 (379 ) 800 (6 ) 62,580 (385 ) Asset backed securities 21,888 (98 ) 1,587 (29 ) 23,475 (127 ) Total fixed maturity securities $ 2,341,522 $ (31,013 ) $ 43,087 $ (1,191 ) $ 2,384,609 $ (32,204 ) Equity Securities: Common stock $ 12,077 $ (1,027 ) $ — $ — $ 12,077 $ (1,027 ) Less Than 12 Months 12 Months or More Total As of December 31, 2016 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed Maturity Securities: U.S. treasury securities $ 293,155 $ (1,613 ) $ 22,989 $ (4 ) $ 316,144 $ (1,617 ) U.S. government agencies 7,866 (17 ) — — 7,866 (17 ) Municipal bonds 519,578 (15,207 ) 15,742 (670 ) 535,320 (15,877 ) Foreign government 128,863 (688 ) 12,659 (38 ) 141,522 (726 ) Corporate bonds: Finance 1,071,982 (7,210 ) 16,840 (512 ) 1,088,822 (7,722 ) Industrial 1,200,129 (13,648 ) 114,035 (3,467 ) 1,314,164 (17,115 ) Utilities 119,488 (423 ) 10,391 (787 ) 129,879 (1,210 ) Commercial mortgage-backed securities 71,780 (1,654 ) 10,910 (908 ) 82,690 (2,562 ) Residential mortgage-backed securities: Agency backed 718,098 (13,469 ) 8,144 (60 ) 726,242 (13,529 ) Non-agency backed 24,372 (869 ) 4,462 (134 ) 28,834 (1,003 ) Collateralized loan / debt obligations 97,923 (433 ) 32,937 (318 ) 130,860 (751 ) Asset backed securities 9,220 (124 ) 4,926 (136 ) 14,146 (260 ) Total fixed maturity securities $ 4,262,454 $ (55,355 ) $ 254,035 $ (7,034 ) $ 4,516,489 $ (62,389 ) Equity Securities: Preferred stock $ 529 $ (30 ) $ — $ (29 ) $ 529 $ (59 ) Common stock 46,254 (1,394 ) 9,991 (954 ) 56,245 (2,348 ) Total equity securities $ 46,783 $ (1,424 ) $ 9,991 $ (983 ) $ 56,774 $ (2,407 )
Fair Values of Restricted Assets	The fair values of the Company's restricted assets as of June 30, 2017 and December 31, 2016 are as follows: June 30, 2017 December 31, 2016 Restricted cash and cash equivalents $ 855,672 $ 713,338 Restricted investments - fixed maturity at fair value 2,602,094 2,126,216 Total restricted cash, cash equivalents, and investments $ 3,457,766 $ 2,839,554
Realized Gain (Loss) on Investments	The tables below summarize the gross and net realized gains and (losses) for the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, 2017 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 14,136 $ (793 ) $ 13,343 Equity securities, available-for-sale 7,288 (958 ) 6,330 Fixed maturity securities, trading 2,819 (4,335 ) (1,516 ) Equity securities, trading 2,401 (12,865 ) (10,464 ) Other investments 15,762 — 15,762 $ 42,406 $ (18,951 ) $ 23,455 Three Months Ended June 30, 2016 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 35,008 $ (1,571 ) $ 33,437 Equity securities, available-for-sale 608 (658 ) (50 ) Equity securities, trading 5,315 (5,575 ) (260 ) Other investments 4 (1,076 ) (1,072 ) Write-down of equity securities, available-for-sale — (16,956 ) (16,956 ) $ 40,935 $ (25,836 ) $ 15,099 Six Months Ended June 30, 2017 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 22,447 $ (2,056 ) $ 20,391 Equity securities, available-for-sale 12,511 (1,599 ) 10,912 Fixed maturity securities, trading 5,193 (9,769 ) (4,576 ) Equity securities, trading 8,487 (19,151 ) (10,664 ) Other investments 16,027 (20 ) 16,007 $ 64,665 $ (32,595 ) $ 32,070 Six Months Ended June 30, 2016 Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 39,811 $ (1,617 ) $ 38,194 Equity securities, available-for-sale 1,268 (799 ) 469 Equity securities, trading 14,927 (12,431 ) 2,496 Other investments 4 (1,133 ) (1,129 ) Write-down of equity securities, available-for-sale — (16,956 ) (16,956 ) $ 56,010 $ (32,936 ) $ 23,074

Fair Value of Financial Instr24

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurement of Financial Assets and Financial Liabilities on Recurring Basis	The following tables present the level within the fair value hierarchy at which the Company’s financial assets and financial liabilities are measured on a recurring basis as of June 30, 2017 and December 31, 2016 : As of June 30, 2017 Total Level 1 Level 2 Level 3 Financial Assets: U.S. treasury securities $ 355,747 $ 355,747 $ — $ — U.S. government agencies 13,796 — 13,796 — Municipal bonds 935,642 — 935,642 — Foreign government 193,570 — 191,359 2,211 Corporate bonds and other bonds: Finance 1,595,070 — 1,581,452 13,618 Industrial 2,297,807 — 2,295,722 2,085 Utilities 378,753 — 378,753 — Commercial mortgage-backed securities 474,305 — 450,707 23,598 Residential mortgage-backed securities: Agency backed 909,779 — 909,779 — Non-agency backed 4,233 — 4,233 — Collateralized loan / debt obligations 510,922 — 510,922 — Asset-backed securities 129,738 — 129,738 — Equity securities, available-for-sale 108,830 86,584 898 21,348 Equity securities, trading 84,574 82,498 25 2,051 Life settlement contracts 396,782 — — 396,782 Total Financial Assets $ 8,389,548 $ 524,829 $ 7,403,026 $ 461,693 Financial Liabilities: Securities sold but not yet purchased, at fair value $ 64,947 $ 64,947 $ — $ — Securities sold under agreements to repurchase, at contract value 31,698 — 31,698 — Life settlement contract profit commission 5,714 — — 5,714 Contingent consideration 97,615 — — 97,615 Total Financial Liabilities $ 199,974 $ 64,947 $ 31,698 $ 103,329 As of December 31, 2016 Total Level 1 Level 2 Level 3 Financial Assets: U.S. treasury securities $ 330,654 $ 330,654 $ — $ — U.S. government agencies 63,732 — 63,732 — Municipal bonds 854,170 — 854,170 — Foreign government 152,876 — 149,298 3,578 Corporate bonds and other bonds: Finance 1,566,288 — 1,559,800 6,488 Industrial 2,296,391 — 2,291,351 5,040 Utilities 204,082 — 199,503 4,579 Commercial mortgage-backed securities 177,994 — 177,994 — Residential mortgage-backed securities: Agency backed 1,210,385 — 1,186,315 24,070 Non-agency backed 61,229 — 58,109 3,120 Collateralized loan / debt obligations 484,405 — 484,405 — Asset-backed securities 29,710 — 29,710 — Equity securities, available-for-sale 137,162 66,228 49,618 21,316 Equity securities, trading 81,960 78,827 — 3,133 Life settlement contracts 356,856 — — 356,856 Total Financial Assets $ 8,007,894 $ 475,709 $ 7,104,005 $ 428,180 Financial Liabilities: Securities sold but not yet purchased, at fair value $ 36,394 $ 36,394 $ — $ — Fixed maturity securities sold but not yet purchased 160,270 — 160,270 — Life settlement contract profit commission 4,940 — — 4,940 Contingent consideration (as restated) 71,657 — — 71,657 Derivatives 243 — 243 — Total Financial Liabilities $ 273,504 $ 36,394 $ 160,513 $ 76,597
Changes in Fair Value of Level 3 Financial Assets And Liabilities	The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets and liabilities for the three and six months ended June 30, 2017 and 2016 . The transfers into and out of Level 3 were due to changes in the availability of market observable inputs. All transfers are reflected in the table at fair value as of the end of the reporting period. Balance as of March 31, 2017 Net income (loss) Other comprehensive income Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, Equity securities, trading $ 4,117 $ (74 ) $ — $ — $ — $ (1,992 ) $ 2,051 Equity securities, available-for-sale 17,383 — 93 76 (16,748 ) 20,544 21,348 Fixed maturities, available-for-sale 35,173 — 225 5,166 (2,312 ) 3,260 41,512 Life settlement contracts 397,493 13,121 — 1,250 (15,082 ) — 396,782 Life settlement contract profit commission (5,599 ) (115 ) — — — — (5,714 ) Contingent consideration (72,330 ) (3,117 ) — (27,179 ) 5,011 — (97,615 ) Total $ 376,237 $ 9,815 $ 318 $ (20,687 ) $ (29,131 ) $ 21,812 $ 358,364 Balance as of December 31, 2016 Net income (loss) Other comprehensive income (loss) Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, 2017 Equity securities, trading $ 3,133 $ (422 ) $ — $ 4,484 $ (2,134 ) $ (3,010 ) $ 2,051 Equity securities, available-for-sale 21,316 — 338 76 (16,748 ) 16,366 21,348 Fixed maturities, available-for-sale 46,875 — (489 ) 7,505 (2,775 ) (9,604 ) 41,512 Life settlement contracts 356,856 48,616 — 16,473 (25,163 ) — 396,782 Life settlement contract profit commission (4,940 ) (774 ) — — — — (5,714 ) Contingent consideration (71,657 ) (3,790 ) — (27,179 ) 5,011 — (97,615 ) Total $ 351,583 $ 43,630 $ (151 ) $ 1,359 $ (41,809 ) $ 3,752 $ 358,364 Balance as of March 31, 2016 Net income (loss) Other comprehensive loss Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, Equity securities, available-for-sale $ 25,556 $ — $ (776 ) $ (16 ) $ — $ — $ 24,764 Life settlement contracts 294,573 28,532 — 11,330 (30,001 ) — 304,434 Life settlement contract profit commission (7,168 ) (1,886 ) — — — — (9,054 ) Contingent consideration (73,867 ) (3,587 ) — (11,461 ) 13,143 — (75,772 ) Total $ 239,094 $ 23,059 $ (776 ) $ (147 ) $ (16,858 ) $ — $ 244,372 Balance as of January 1, 2016 Net income (loss) Other comprehensive loss Purchases and issuances Sales and settlements Net transfers into (out of) Level 3 Balance as of June 30, Equity securities, available-for-sale $ 37,211 $ — $ (12,449 ) $ 2 $ — $ — $ 24,764 Life settlement contracts 264,001 59,161 — 11,330 (30,058 ) — 304,434 Life settlement contract profit commission (15,406 ) (9,054 ) — — 15,406 — (9,054 ) Contingent consideration (as restated) (84,760 ) (5,998 ) — (8,460 ) 23,446 — (75,772 ) Total $ 201,046 $ 44,109 $ (12,449 ) $ 2,872 $ 8,794 $ — $ 244,372
Fair Value Measurements, Recurring and Nonrecurring	The fair value of the Company's debt arrangements as of June 30, 2017 was as follows: Carrying Value Fair Value 6.125% Notes due 2023 $ 248,322 $ 246,684 2.75% Convertible senior notes due 2044 169,615 176,132 7.25% Subordinated Notes due 2055 145,265 150,120 7.50% Subordinated Notes due 2055 130,739 137,268 Revolving credit facility 130,000 130,000 Junior subordinated debentures due 2035-2037 122,072 98,600 Trust preferred securities due 2033-2037 92,786 85,811 Republic promissory note 52,343 53,484 Other 193,487 193,487 Total $ 1,284,629 $ 1,271,586
Schedule of Reconciliation of Net Income	A reconciliation of net income for life settlement contracts in the above table to gain (loss) on investment in life settlement contracts net of profit commission included in the Consolidated Statements of Income for the three and six months ended June 30, 2017 and 2016 is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Net income $ 13,121 $ 28,532 $ 48,616 $ 59,161 Premiums paid (13,460 ) (13,354 ) (38,734 ) (25,456 ) Profit commission (115 ) (1,886 ) (774 ) (9,054 ) Other expenses (807 ) (616 ) (1,759 ) (1,245 ) (Loss) gain on investment in life settlement contracts $ (1,261 ) $ 12,676 $ 7,349 $ 23,406
Premiums to be Paid for Each of Five Succeeding Fiscal Years to keep Life Insurance Policies in Force	The following summarizes data utilized in estimating the fair value of the portfolio of life insurance policies as of June 30, 2017 and December 31, 2016 , and only includes data for policies to which the Company assigned value at those dates: June 30, December 31, Average age of insured (years) 83.0 82.8 Average life expectancy, months (1) 103 107 Average face amount per policy $ 6,658 $ 6,572 Effective discount rate (2) 13.0 % 12.4 % (1) Standard life expectancy as adjusted for specific circumstances. (2) Effective discount rate ("EDR") is the Company's estimated internal rate of return on its life settlement contract portfolio and is determined from the gross expected cash flows and valuation of the portfolio. The EDR is inclusive of the reserves and the gross expected cash flows of the portfolio. The Company anticipates that the EDR's range is between 12.5% and 17.5% and reflects the uncertainty that exists surrounding the information available as of the reporting date. As the accuracy and reliability of information improves (declines), the EDR will decrease (increase).
Increase or (Decrease) in Carrying Value of Investment in Life Insurance Policies	The Company's assumptions are, by their nature, inherently uncertain and the effect of changes in estimates may be significant. The fair value measurements used in estimating the present value calculation are derived from valuation techniques generally used in the industry that include inputs for the asset that are not based on observable market data. The extent to which the fair value could reasonably vary in the near term has been quantified by evaluating the effect of changes in significant underlying assumptions used to estimate the fair value amount. If the life expectancies were increased or decreased by 4 months and the discount factors were increased or decreased by 1% while all other variables were held constant, the carrying value of the investment in life insurance policies would increase or (decrease) by the unaudited amounts summarized below as of June 30, 2017 and December 31, 2016 : Change in life expectancy Plus 4 Months Minus 4 Months Investment in life policies: June 30, 2017 $ (47,918 ) $ 47,529 December 31, 2016 $ (44,207 ) $ 43,492 Change in discount rate (1) Plus 1% Minus 1% Investment in life policies: June 30, 2017 $ (32,702 ) $ 36,213 December 31, 2016 $ (29,881 ) $ 33,155 (1) Discount rate is a present value calculation that considers legal risk, credit risk and liquidity risk and is a component of EDR.

Investment in Life Settlements

Investment in Life Settlements (Tables)	6 Months Ended
	Jun. 30, 2017
Investments, All Other Investments [Abstract]
Investment in Life Settlements	The following tables describe the Company’s investment in life settlements as of June 30, 2017 and December 31, 2016 : Expected Maturity Term in Years Number of Life Settlement Contracts (in whole numbers) Fair Value (1) Face Value As of June 30, 2017 0-1 — $ — $ — 1-2 1 1,935 2,500 2-3 9 46,545 90,422 3-4 10 34,553 81,000 4-5 14 38,547 85,900 Thereafter 224 275,202 1,437,413 Total 258 $ 396,782 $ 1,697,235 Expected Maturity Term in Years Number of Life Settlement Contracts (in whole numbers) Fair Value (1) Face Value As of December 31, 2016 0-1 — $ — $ — 1-2 2 8,873 12,500 2-3 7 39,495 63,000 3-4 10 37,436 75,422 4-5 10 34,003 82,900 Thereafter 225 237,049 1,405,414 Total 254 $ 356,856 $ 1,639,236 (1) As of June 30, 2017 and December 31, 2016 , the Company determined the fair value of 10 and 18 policies, respectively, to be negative and, therefore, assigned a fair value of zero to those policies. For these contracts, the table below details the amount of premiums paid and the death benefits received during the twelve months preceding June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 Number of policies with a negative value from discounted cash flow model as of period end (in whole numbers) 10 18 Premiums paid for the preceding twelve month period for period ended $ 974 $ 2,640 Death benefit received $ — $ —
Premiums to be Paid for Each of Five Succeeding Fiscal Years to keep Life Insurance Policies in Force	Premiums to be paid by the LSC Entities for each of the five succeeding fiscal years to keep the life insurance policies in force as of June 30, 2017 , are as follows: Premiums Due on Life Settlement Contracts 2017 $ 51,704 2018 53,042 2019 51,922 2020 47,867 2021 46,039 Thereafter 509,478 Total $ 760,052

Loss and loss adjustment expe26

Loss and loss adjustment expense reserves (Tables)	6 Months Ended
	Jun. 30, 2017
Insurance [Abstract]
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense	The following table provides a reconciliation of the beginning and ending balances for loss and loss adjustment expense reserves ("Loss and LAE") for the three months ended June 30, 2017 , and 2016 , respectively: 2017 2016 Loss and LAE, gross of related reinsurance recoverables at beginning of period $ 10,630,162 $ 7,516,089 Less: Reinsurance recoverables at beginning of period 4,042,932 2,731,397 Net balance, beginning of period 6,587,230 4,784,692 Incurred related to: Current year 951,409 758,212 Prior year 73,069 26,181 Total incurred during the period 1,024,478 784,393 Paid related to: Current year (230,377 ) (174,915 ) Prior year (535,417 ) (468,347 ) Total paid during the period (765,794 ) (643,262 ) Loss portfolio transfers — 143,667 Acquired loss and loss adjustment reserves — 463,115 Retroactive reinsurance adjustment (698,069 ) — Effect of foreign exchange rates 59,522 (4,060 ) Net balance, end of period 6,207,367 5,528,545 Plus reinsurance recoverables at end of period 4,942,144 3,568,863 Loss and LAE, gross of related reinsurance recoverables at end of period $ 11,149,511 $ 9,097,408 The following table provides a reconciliation of the beginning and ending balances for Loss and LAE for the six months ended June 30, 2017 , and 2016 , respectively: 2017 2016 Loss and LAE, gross of related reinsurance recoverables at beginning of period $ 10,140,716 $ 7,208,367 Less: Reinsurance recoverables at beginning of period 3,873,786 2,665,187 Net balance, beginning of period 6,266,930 4,543,180 Incurred related to: Current year 1,772,892 1,397,334 Prior year 91,920 102,132 Total incurred during the period 1,864,812 1,499,466 Paid related to: Current year (366,242 ) (268,779 ) Prior year (1,148,277 ) (947,334 ) Total paid during the period (1,514,519 ) (1,216,113 ) Loss portfolio transfers — 312,049 Acquired loss and loss adjustment reserves 200,802 463,115 Retroactive reinsurance adjustment (698,069 ) — Effect of foreign exchange rates 87,411 (73,152 ) Net balance, end of period 6,207,367 5,528,545 Plus reinsurance recoverables at end of period 4,942,144 3,568,863 Loss and LAE, gross of related reinsurance recoverables at end of period $ 11,149,511 $ 9,097,408

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Borrowings	The Company’s outstanding debt consisted of the following at June 30, 2017 and December 31, 2016 : June 30, 2017 December 31, 2016 6.125% Notes due 2023 (the "2023 Notes") $ 248,322 $ 248,185 Secured loan agreements 174,136 75,762 2.75% Convertible senior notes due 2044 (the "2044 Notes") 169,615 166,387 7.25% Subordinated notes due 2055 (the "7.25% 2055 Notes") 145,265 145,202 7.50% Subordinated notes due 2055 (the "7.50% 2055 Notes") 130,739 130,684 Revolving credit facility 130,000 130,000 Junior subordinated debentures (the "2035-2037 Notes") 122,072 122,028 Trust preferred securities (the "2033-2037 TPS Notes") 92,786 92,786 Promissory notes 66,402 118,643 5.5% Convertible senior notes due 2021 (the "2021 Notes") 5,292 5,223 $ 1,284,629 $ 1,234,900
Schedule of Line of Credit Facilities	Additionally, the Company utilizes various letters of credit in its operations. The following is a summary of the Company's letters of credit as of June 30, 2017 : Limit Outstanding Available Revolving credit facility $ 175,000 $ 174,267 $ 733 Funds at Lloyd's facility 670,942 647,889 23,053 ING Bank N.V., BHF-BANK Aktiengesellschaft, and Deutsche Bank Netherlands N.V. facilities 87,715 68,724 18,991 Comerica bank letters of credit 75,000 53,067 21,933 UniCredit Bank 100,000 100,000 — Other letters of credit, in aggregate 102,857 102,857 —
Interest Income and Interest Expense Disclosure	Interest expense, including amortization of original issue discount and deferred origination costs, as well as applicable bank fees, related to the Company's outstanding debt and letters of credit for the three and six months ended June 30, 2017 and 2016 was: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Revolving credit facility $ 1,529 $ 1,098 $ 3,039 $ 2,254 2021 Notes 117 114 234 229 2044 Notes 3,224 3,116 6,449 6,232 2023 Notes 3,896 3,896 7,793 7,793 2035-2037 Notes 1,420 1,546 2,888 3,061 2033-2037 TPS Notes 1,078 769 2,109 769 7.25% 2055 Notes 2,750 2,750 5,500 5,500 7.50% 2055 Notes 2,559 2,559 5,118 5,118 Secured loan agreements 1,493 178 2,827 367 Promissory notes 1,045 1,397 2,708 1,555 Funds at Lloyd's facility 1,236 1,123 2,715 2,322 Other, including interest income 3,882 (634 ) 6,450 (1,414 ) Total $ 24,229 $ 17,912 $ 47,830 $ 33,786

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Summary of Elements Used in Calculating Basic and Diluted Earnings Per Share	The following table is a summary of the elements used in calculating basic and diluted earnings per share for the three and six months ended June 30, 2017 and 2016 : Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 As restated As restated Numerator: Net income attributable to AmTrust common stockholders $ 5,829 $ 127,156 $ 28,461 $ 211,134 Denominator: Weighted average common shares outstanding – basic 180,679 173,182 175,799 174,346 Plus: Dilutive effect of stock options, convertible debt, other 849 1,865 1,115 1,881 Weighted average common shares outstanding – dilutive 181,528 175,047 176,914 176,227 Net income per AmTrust common share - basic $ 0.03 $ 0.73 $ 0.16 $ 1.21 Net income per AmTrust common share – diluted $ 0.03 $ 0.73 $ 0.16 $ 1.20

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Schedule of Preliminary Assets Acquired and Liabilities Assumed	A summary of the preliminary assets acquired and liabilities assumed for AmeriHealth Casualty are as follows: Assets Cash and investments $ 275,351 Premium receivable 45,288 Accrued interest and dividends 1,162 Reinsurance recoverable 14,512 Other assets 43,696 Goodwill and intangible assets 17,509 Total assets $ 397,518 Liabilities Loss and loss adjustment expense reserves $ 227,865 Unearned premiums 49,284 Accrued expenses and other liabilities 27,583 Total liabilities $ 304,732 Acquisition price $ 92,786 A summary of the preliminary assets acquired and liabilities assumed for PDP are as follows: Assets Cash and investments $ 11,826 Premium receivable 29,188 Other assets 705 Property and equipment 776 Goodwill and intangible assets 55,586 Total assets $ 98,081 Liabilities Accrued expenses and other liabilities $ 35,659 Total liabilities $ 35,659 Acquisition price $ 62,422

Shareholder Equity and Accumu30

Shareholder Equity and Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Ownership Components of Total Equity	The following table summarizes the ownership components of total stockholders' equity: Six Months Ended June 30, 2017 2016 AmTrust Non-Controlling Interest Total AmTrust Non-Controlling Interest Total (As restated) (As restated) Balance, December 31, $ 3,269,103 $ 196,510 $ 3,465,613 $ 2,723,780 $ 176,455 $ 2,900,235 Net income 61,603 17,148 78,751 231,501 9,493 240,994 Unrealized holding gain 75,099 — 75,099 191,347 — 191,347 Reclassification adjustment (30,858 ) — (30,858 ) (8,045 ) — (8,045 ) Foreign currency translation 76,526 — 76,526 (80,007 ) — (80,007 ) Unrealized gain on interest rate swap 120 — 120 287 — 287 Share exercises, compensation and other 9,662 — 9,662 4,421 — 4,421 Common stock issuance 298,747 — 298,747 — — — Common share purchase, net — — — (103,164 ) — (103,164 ) Common stock dividends (63,342 ) — (63,342 ) (52,189 ) (10,229 ) (62,418 ) Preferred stock issuance, net of fees — — — 139,070 — 139,070 Preferred stock dividends (33,142 ) — (33,142 ) (20,367 ) — (20,367 ) Capital contribution, net — 19,298 19,298 — 5,500 5,500 Balance, June 30, $ 3,663,518 $ 232,956 $ 3,896,474 $ 3,026,634 $ 181,219 $ 3,207,853
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the activities and components of accumulated other comprehensive income (loss): Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive Income (Loss) Balance, March 31, 2017 $ (174,340 ) $ 79,791 $ (80 ) $ (3,177 ) $ (97,806 ) Other comprehensive income (loss) before reclassification 62,663 66,029 28 — 128,720 Amounts reclassed from accumulated other comprehensive income (loss) — (19,228 ) — — (19,228 ) Income tax (expense) — (16,521 ) — — (16,521 ) Net current-period other comprehensive income (loss) 62,663 30,280 28 — 92,971 Balance, June 30, 2017 $ (111,677 ) $ 110,071 $ (52 ) $ (3,177 ) $ (4,835 ) Balance, March 31, 2016 (As restated) $ (145,268 ) $ 48,035 $ (581 ) $ (107 ) $ (97,921 ) Other comprehensive income (loss) before reclassification (32,809 ) 158,930 258 — 126,379 Amounts reclassed from accumulated other comprehensive income (loss) — (3,920 ) — — (3,920 ) Income tax (expense) — (54,254 ) (90 ) — (54,344 ) Net current-period other comprehensive income (32,809 ) 100,756 168 — 68,115 Balance, June 30, 2016 (As restated) $ (178,077 ) $ 148,791 $ (413 ) $ (107 ) $ (29,806 ) Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive Income (Loss) Balance, December 31, 2016 $ (188,203 ) $ 65,830 $ (172 ) $ (3,177 ) $ (125,722 ) Other comprehensive income before reclassification 76,526 98,060 120 — 174,706 Amounts reclassed from accumulated other comprehensive income (loss) — (30,858 ) — — (30,858 ) Income tax benefit (expense) — (22,961 ) — — (22,961 ) Net current-period other comprehensive income 76,526 44,241 120 — 120,887 Balance, June 30, 2017 $ (111,677 ) $ 110,071 $ (52 ) $ (3,177 ) $ (4,835 ) Balance, December 31, 2015 (As restated) $ (98,074 ) $ (34,511 ) $ (700 ) $ (107 ) $ (133,392 ) Other comprehensive income (loss) before reclassification (80,003 ) 286,588 441 — 207,026 Amounts reclassed from accumulated other comprehensive (loss) — (4,578 ) — — (4,578 ) Income tax benefit (expense) — (98,708 ) (154 ) — (98,862 ) Net current-period other comprehensive (loss) income (80,003 ) 183,302 287 — 103,586 Balance, June 30, 2016 (As restated) $ (178,077 ) $ 148,791 $ (413 ) $ (107 ) $ (29,806 )

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Results of Operations of Business Segments	The following tables summarize the results of operations of the business segments for the three and six months ended June 30, 2017 and 2016 : Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Three Months Ended June 30, 2017: Gross written premium $ 1,123,292 $ 795,932 $ 280,523 $ — $ 2,199,747 Revenues: Net written premium $ 638,762 $ 555,486 $ 177,654 $ — $ 1,371,902 Change in unearned premium (6,898 ) (16,483 ) 32,188 — 8,807 Net earned premium 631,864 539,003 209,842 — 1,380,709 Expenses: Loss and loss adjustment expense (466,901 ) (370,840 ) (186,737 ) — (1,024,478 ) Acquisition costs and other underwriting expenses (170,179 ) (140,310 ) (62,706 ) — (373,195 ) Total expenses (637,080 ) (511,150 ) (249,443 ) — (1,397,673 ) Underwriting (loss) income (5,216 ) 27,853 (39,601 ) — (16,964 ) Other income (loss) Service and fee income 30,990 98,178 443 38,835 168,446 Investment income and realized gain 32,519 27,719 12,443 — 72,681 Other expenses (51,496 ) (35,748 ) (12,686 ) (99,930 ) (199,860 ) Interest expense (12,403 ) (8,740 ) (3,086 ) — (24,229 ) Foreign currency loss — (58,948 ) — — (58,948 ) Loss on life settlement contracts (859 ) (268 ) (134 ) — (1,261 ) Benefit (provision) for income taxes 7,477 28,595 (281 ) (16,064 ) 19,727 Equity in earnings of unconsolidated subsidiary – related party — — — 69,531 69,531 Net income (loss) $ 1,012 $ 78,641 $ (42,902 ) $ (7,628 ) $ 29,123 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Three Months Ended June 30, 2016 Gross written premium $ 1,060,558 $ 651,561 $ 360,993 $ — $ 2,073,112 Revenues: Net written premium $ 601,638 $ 447,061 $ 219,737 $ — $ 1,268,436 Change in unearned premium (28,660 ) (89,177 ) 31,153 — (86,684 ) Net earned premium 572,978 357,884 250,890 — 1,181,752 Expenses: Loss and loss adjustment expense (382,950 ) (231,328 ) (170,115 ) — (784,393 ) Acquisition costs and other underwriting expenses (150,149 ) (78,773 ) (65,555 ) — (294,477 ) Total expenses (533,099 ) (310,101 ) (235,670 ) — (1,078,870 ) Underwriting income (As restated) 39,879 47,783 15,220 — 102,882 Other income (loss) Service and fee income (As restated) 25,745 69,155 1,228 28,178 124,306 Investment income and realized gain (loss) 28,193 19,506 18,211 (66 ) 65,844 Other expenses (As restated) (34,321 ) (21,154 ) (11,697 ) (67,172 ) (134,344 ) Interest expense (As restated) (9,180 ) (5,612 ) (3,120 ) — (17,912 ) Foreign currency loss (As restated) — (28,995 ) — — (28,995 ) Gain on life settlement contracts 6,507 3,961 2,208 — 12,676 (Loss) gain on acquisition (9,223 ) 48,320 — — 39,097 (Provision) benefit for income taxes (As restated) (6,256 ) (19,030 ) (3,184 ) 4,663 (23,807 ) Equity in earnings of unconsolidated subsidiary – related party — — — 4,802 4,802 Net income (loss) (As restated) $ 41,344 $ 113,934 $ 18,866 $ (29,595 ) $ 144,549 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Six Months Ended June 30, 2017 Gross written premium $ 2,380,577 $ 1,528,374 $ 557,076 $ — $ 4,466,027 Revenues: Net written premium $ 1,297,741 $ 1,065,694 $ 352,533 $ — $ 2,715,968 Change in unearned premium (112,252 ) (53,201 ) 52,726 — (112,727 ) Net earned premium 1,185,489 1,012,493 405,259 — 2,603,241 Expenses: Loss and loss adjustment expense (844,338 ) (683,444 ) (337,030 ) — (1,864,812 ) Acquisition costs and other underwriting expenses (324,820 ) (258,773 ) (117,817 ) — (701,410 ) Total expenses (1,169,158 ) (942,217 ) (454,847 ) — (2,566,222 ) Underwriting (loss) income 16,331 70,276 (49,588 ) — 37,019 Other income (loss) Service and fee income 59,644 185,119 1,980 59,199 305,942 Investment income and realized gain 62,209 53,847 28,565 — 144,621 Other expenses (96,670 ) (62,064 ) (22,622 ) (181,357 ) (362,713 ) Interest expense (25,496 ) (16,368 ) (5,966 ) — (47,830 ) Foreign currency loss — (76,916 ) — — (76,916 ) Gain on life settlement contracts 3,917 2,515 917 — 7,349 (Provision) benefit for income taxes (401 ) (3,147 ) 940 979 (1,629 ) Equity in earnings of unconsolidated subsidiary – related party — — — 73,488 73,488 Net income (loss) $ 19,534 $ 153,262 $ (45,774 ) $ (47,691 ) $ 79,331 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Six Months Ended June 30, 2016 Gross written premium $ 2,126,690 $ 1,181,007 $ 698,489 $ — $ 4,006,186 Revenues: Net written premium $ 1,226,166 $ 784,894 $ 478,055 $ — $ 2,489,115 Change in unearned premium (149,094 ) (105,169 ) 21,182 — (233,081 ) Net earned premium 1,077,072 679,725 499,237 — 2,256,034 Expenses: Loss and loss adjustment expense (715,634 ) (442,264 ) (341,568 ) — (1,499,466 ) Acquisition costs and other underwriting expenses (283,681 ) (151,624 ) (131,640 ) — (566,945 ) Total expenses (999,315 ) (593,888 ) (473,208 ) — (2,066,411 ) Underwriting income (As restated) 77,757 85,837 26,029 — 189,623 Other income (loss) Service and fee income (As restated) 58,282 143,539 1,517 49,773 253,111 Investment income and realized gain 55,047 38,676 29,511 — 123,234 Other expenses (As restated) (69,968 ) (38,856 ) (22,981 ) (131,806 ) (263,611 ) Interest expense (As restated) (17,935 ) (9,960 ) (5,891 ) — (33,786 ) Foreign currency loss (As restated) — (67,228 ) — — (67,228 ) Gain on life settlement contracts 12,425 6,900 4,081 — 23,406 Gain on acquisition 455 48,320 — — 48,775 (Provision) benefit for income taxes (As restated) (17,471 ) (31,195 ) (4,857 ) 10,756 (42,767 ) Equity in earnings of unconsolidated subsidiary – related party — — — 10,578 10,578 Net income (loss) (As restated) $ 98,592 $ 176,033 $ 27,409 $ (60,699 ) $ 241,335 The following tables summarize net earned premium by major line of business, by segment, for the three and six months ended June 30, 2017 and 2016 : Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended June 30, 2017: Workers' compensation $ 373,088 $ — $ 114,643 $ 487,731 Warranty — 255,794 16 255,810 Other liability — 46,198 52,131 98,329 Commercial auto and liability, physical damage 95,556 — 28,520 124,076 Medical malpractice — 53,874 — 53,874 Other 163,220 183,137 14,532 360,889 Total net earned premium $ 631,864 $ 539,003 $ 209,842 $ 1,380,709 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended June 30, 2016: Workers' compensation $ 358,894 $ — $ 199,704 $ 558,598 Warranty — 179,169 — 179,169 Other liability — 33,305 12,800 46,105 Commercial auto and liability, physical damage 111,992 8,684 30,602 151,278 Medical malpractice — 62,733 — 62,733 Other 102,092 73,993 7,784 183,869 Total net earned premium $ 572,978 $ 357,884 $ 250,890 $ 1,181,752 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Six Months Ended June 30, 2017: Workers' compensation $ 709,413 $ — $ 223,638 $ 933,051 Warranty — 470,321 19 470,340 Other liability — 89,507 106,670 196,177 Commercial auto and liability, physical damage 196,702 — 54,475 251,177 Medical malpractice — 106,653 — 106,653 Other 279,374 346,012 20,457 645,843 Total net earned premium $ 1,185,489 $ 1,012,493 $ 405,259 $ 2,603,241 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Six Months Ended June 30, 2016: Workers' compensation $ 704,937 $ — $ 307,417 $ 1,012,354 Warranty — 347,502 — 347,502 Other liability 5,249 74,018 83,381 162,648 Commercial auto and liability, physical damage 197,896 17,176 65,745 280,817 Medical malpractice — 106,750 — 106,750 Other 168,990 134,279 42,694 345,963 Total net earned premium $ 1,077,072 $ 679,725 $ 499,237 $ 2,256,034

Investments - Amortized Cost, E

Investments - Amortized Cost, Estimated Market Value and Gross Unrealized Appreciation and Depreciation of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
U.S. treasury securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	$ 356,281	$ 331,036
Gross unrealized gains	1,177	1,235
Gross unrealized losses	(1,711)	(1,617)
Fair Value	355,747	330,654
U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	13,762	63,467
Gross unrealized gains	41	282
Gross unrealized losses	(7)	(17)
Fair Value	13,796	63,732
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	925,039	860,444
Gross unrealized gains	15,092	9,603
Gross unrealized losses	(5,318)	(15,877)
Fair Value	934,813	854,170
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	190,445	149,365
Gross unrealized gains	4,238	4,237
Gross unrealized losses	(1,113)	(726)
Fair Value	193,570	152,876
Finance | Corporate bonds:
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	1,554,129	1,535,606
Gross unrealized gains	44,021	38,404
Gross unrealized losses	(3,080)	(7,722)
Fair Value	1,595,070	1,566,288
Industrial | Corporate bonds:
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	2,220,747	2,222,843
Gross unrealized gains	61,374	62,133
Gross unrealized losses	(8,288)	(17,115)
Fair Value	2,273,833	2,267,861
Utilities | Corporate bonds:
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	369,235	195,607
Gross unrealized gains	10,948	4,433
Gross unrealized losses	(1,430)	(1,210)
Fair Value	378,753	198,830
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	474,262	178,092
Gross unrealized gains	4,594	2,464
Gross unrealized losses	(4,551)	(2,562)
Fair Value	474,305	177,994
Agency backed | Residential mortgage-backed securities:
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	902,351	1,210,229
Gross unrealized gains	13,527	13,685
Gross unrealized losses	(6,099)	(13,529)
Fair Value	909,779	1,210,385
Non-agency backed | Residential mortgage-backed securities:
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	4,326	61,646
Gross unrealized gains	2	586
Gross unrealized losses	(95)	(1,003)
Fair Value	4,233	61,229
Collateralized loan / debt obligation
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	501,560	476,767
Gross unrealized gains	9,747	8,389
Gross unrealized losses	(385)	(751)
Fair Value	510,922	484,405
Asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	128,987	29,939
Gross unrealized gains	878	31
Gross unrealized losses	(127)	(260)
Fair Value	129,738	29,710
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	756	4,044
Gross unrealized gains	21	0
Gross unrealized losses	0	(59)
Fair Value	777	3,985
Common stock
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	80,722	122,626
Gross unrealized gains	28,358	12,899
Gross unrealized losses	(1,027)	(2,348)
Fair Value	108,053	133,177
Fixed Maturity Securities:
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	7,641,124	7,315,041
Gross unrealized gains	165,639	145,482
Gross unrealized losses	(32,204)	(62,389)
Fair Value	7,774,559	7,398,134
Equity securities, available-for-sale
Schedule of Available-for-sale Securities [Line Items]
Cost or amortized cost	81,478	126,670
Gross unrealized gains	28,379	12,899
Gross unrealized losses	(1,027)	(2,407)
Fair Value	$ 108,830	$ 137,162

Investments - Summary of Availa

Investments - Summary of Available for Sale Fixed Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Amortized Cost
Total fixed maturity securities	$ 7,641,124	$ 7,315,041
Fair Value
Total fixed maturity securities	7,774,559	7,398,134
Fixed maturity securities, available-for-sale
Amortized Cost
Due in one year or less	265,819	319,275
Due after one through five years	3,152,712	2,956,429
Due after five through ten years	1,737,598	1,645,211
Due after ten years	473,509	437,452
Mortgage and asset backed securities	2,011,486	1,956,674
Total fixed maturity securities	7,641,124	7,315,041
Fair Value
Due in one year or less	266,562	319,882
Due after one through five years	3,216,906	2,998,711
Due after five through ten years	1,780,579	1,683,112
Due after ten years	481,535	432,702
Mortgage and asset backed securities	2,028,977	1,963,727
Total fixed maturity securities	$ 7,774,559	$ 7,398,134

Investments - Summary of Gross

Investments - Summary of Gross Unrealized Losses of Fixed-maturities and Equity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
U.S. treasury securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 296,565	$ 293,155
Unrealized Losses	(1,709)	(1,613)
Fair Value	689	22,989
Unrealized Losses	(2)	(4)
Fair Value	297,254	316,144
Unrealized Losses	(1,711)	(1,617)
U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Fair Value	4,261	7,866
Unrealized Losses	(7)	(17)
Fair Value	0	0
Unrealized Losses	0	0
Fair Value	4,261	7,866
Unrealized Losses	(7)	(17)
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	382,730	519,578
Unrealized Losses	(5,087)	(15,207)
Fair Value	8,526	15,742
Unrealized Losses	(231)	(670)
Fair Value	391,256	535,320
Unrealized Losses	(5,318)	(15,877)
Foreign government
Schedule of Available-for-sale Securities [Line Items]
Fair Value	78,986	128,863
Unrealized Losses	(1,046)	(688)
Fair Value	1,933	12,659
Unrealized Losses	(67)	(38)
Fair Value	80,919	141,522
Unrealized Losses	(1,113)	(726)
Finance | Corporate bonds:
Schedule of Available-for-sale Securities [Line Items]
Fair Value	295,860	1,071,982
Unrealized Losses	(3,068)	(7,210)
Fair Value	4,032	16,840
Unrealized Losses	(12)	(512)
Fair Value	299,892	1,088,822
Unrealized Losses	(3,080)	(7,722)
Industrial | Corporate bonds:
Schedule of Available-for-sale Securities [Line Items]
Fair Value	459,696	1,200,129
Unrealized Losses	(8,024)	(13,648)
Fair Value	11,821	114,035
Unrealized Losses	(264)	(3,467)
Fair Value	471,517	1,314,164
Unrealized Losses	(8,288)	(17,115)
Utilities | Corporate bonds:
Schedule of Available-for-sale Securities [Line Items]
Fair Value	79,036	119,488
Unrealized Losses	(1,429)	(423)
Fair Value	507	10,391
Unrealized Losses	(1)	(787)
Fair Value	79,543	129,879
Unrealized Losses	(1,430)	(1,210)
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	254,002	71,780
Unrealized Losses	(4,118)	(1,654)
Fair Value	8,165	10,910
Unrealized Losses	(433)	(908)
Fair Value	262,167	82,690
Unrealized Losses	(4,551)	(2,562)
Agency backed
Schedule of Available-for-sale Securities [Line Items]
Fair Value		718,098
Unrealized Losses		(13,469)
Fair Value		8,144
Unrealized Losses		(60)
Fair Value		726,242
Unrealized Losses		(13,529)
Agency backed | Residential mortgage-backed securities:
Schedule of Available-for-sale Securities [Line Items]
Fair Value	405,149
Unrealized Losses	(6,038)
Fair Value	2,488
Unrealized Losses	(61)
Fair Value	407,637
Unrealized Losses	(6,099)
Non-agency backed
Schedule of Available-for-sale Securities [Line Items]
Fair Value		24,372
Unrealized Losses		(869)
Fair Value		4,462
Unrealized Losses		(134)
Fair Value		28,834
Unrealized Losses		(1,003)
Non-agency backed | Residential mortgage-backed securities:
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,569
Unrealized Losses	(10)
Fair Value	2,539
Unrealized Losses	(85)
Fair Value	4,108
Unrealized Losses	(95)
Collateralized loan / debt obligations
Schedule of Available-for-sale Securities [Line Items]
Fair Value	61,780	97,923
Unrealized Losses	(379)	(433)
Fair Value	800	32,937
Unrealized Losses	(6)	(318)
Fair Value	62,580	130,860
Unrealized Losses	(385)	(751)
Asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	21,888	9,220
Unrealized Losses	(98)	(124)
Fair Value	1,587	4,926
Unrealized Losses	(29)	(136)
Fair Value	23,475	14,146
Unrealized Losses	(127)	(260)
Fixed Maturity Securities:
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,341,522	4,262,454
Unrealized Losses	(31,013)	(55,355)
Fair Value	43,087	254,035
Unrealized Losses	(1,191)	(7,034)
Fair Value	2,384,609	4,516,489
Unrealized Losses	(32,204)	(62,389)
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Fair Value		529
Unrealized Losses		(30)
Fair Value		0
Unrealized Losses		(29)
Fair Value		529
Unrealized Losses		(59)
Common stock
Schedule of Available-for-sale Securities [Line Items]
Fair Value	12,077	46,254
Unrealized Losses	(1,027)	(1,394)
Fair Value	0	9,991
Unrealized Losses	0	(954)
Fair Value	12,077	56,245
Unrealized Losses	$ (1,027)	(2,348)
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		46,783
Unrealized Losses		(1,424)
Fair Value		9,991
Unrealized Losses		(983)
Fair Value		56,774
Unrealized Losses		$ (2,407)

Investments (Trading Securities

Investments (Trading Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities, cost basis	$ 92,700		$ 92,700		$ 76,163
Fair value	84,574		84,574		81,960
Proceeds from sale of trading securities	177,570	$ 49,517	309,415	$ 102,267
Net gains and losses recognized during the period on trading securities	(11,980)	(260)	(15,240)	2,496
Less: Net gains and losses recognized during the period on trading securities sold during the period	2,065	(1,014)	(651)	(7,387)
Unrealized gains and losses recognized during the reporting period on trading securities still held at the reporting date	(9,915)	$ (1,274)	(15,891)	$ (4,891)
Common stock
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities, cost basis	92,700		92,700		76,163
Gross unrealized gains	2,847		2,847		9,842
Gross unrealized losses	(10,973)		(10,973)		(4,045)
Fair value	84,574		84,574		81,960
Fixed Maturity Securities:
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities, cost basis	28,162		28,162		29,081
Gross unrealized gains	140		140		4,701
Gross unrealized losses	(3,499)		(3,499)		0
Fair value	24,803		24,803		33,782
Municipal bonds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities, cost basis	837		837
Gross unrealized gains	0		0
Gross unrealized losses	(8)		(8)
Fair value	829		829
Industrial | Corporate bonds:
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities, cost basis	27,325		27,325		24,151
Gross unrealized gains	140		140		4,379
Gross unrealized losses	(3,491)		(3,491)		0
Fair value	$ 23,974		$ 23,974		28,530
Utilities | Corporate bonds:
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading securities, cost basis					4,930
Gross unrealized gains					322
Gross unrealized losses					0
Fair value					$ 5,252

Investments - Net Investment In

Investments - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 52,200	$ 50,894	$ 117,552	$ 100,384
Investment expenses	(2,974)	(149)	(5,001)	(224)
Net investment income	49,226	50,745	112,551	100,160
Fixed maturity securities, available-for-sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	69,381	46,235	126,650	92,428
Equity securities, available-for-sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	169	4,098	1,569	6,462
Cash and short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1,888	686	3,282	1,772
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	(19,240)	0	(15,001)	0
Fixed Maturity Securities: | Equity securities, trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	0	0	1,032	0
Equity securities, trading | Equity securities, trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 2	$ (125)	$ 20	$ (278)

Investments (Realized Gains and

Investments (Realized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Gross Gains	$ 42,406	$ 40,935	$ 64,665	$ 56,010
Write-down of equity securities, available-for-sale		(16,956)
Total of gross loss including write-downs	(18,951)	(25,836)	(32,595)	(32,936)
Net gain and losses, including write-down	23,455	15,099	32,070	23,074
Available-for-sale | Fixed maturity securities, available-for-sale
Schedule of Available-for-sale Securities [Line Items]
Gross Gains	14,136	35,008	22,447	39,811
Gross Losses	(793)	(1,571)	(2,056)	(1,617)
Net Gains (Losses)	13,343	33,437	20,391	38,194
Write-down of equity securities, available-for-sale				(16,956)
Available-for-sale | Equity securities, available-for-sale
Schedule of Available-for-sale Securities [Line Items]
Gross Gains	7,288	608	12,511	1,268
Gross Losses	(958)	(658)	(1,599)	(799)
Net Gains (Losses)	6,330	(50)	10,912	469
Trading Securities | Fixed maturity securities, available-for-sale
Schedule of Available-for-sale Securities [Line Items]
Gross Gains	2,819		5,193
Gross Losses	(4,335)		(9,769)
Net Gains (Losses)	(1,516)		(4,576)
Trading Securities | Equity securities, available-for-sale
Schedule of Available-for-sale Securities [Line Items]
Gross Gains	2,401	5,315	8,487	14,927
Gross Losses	(12,865)	(5,575)	(19,151)	(12,431)
Net Gains (Losses)	(10,464)	(260)	(10,664)	2,496
Other investments
Schedule of Available-for-sale Securities [Line Items]
Gross Gains	15,762	4	16,027	4
Gross Losses	0	(1,076)	(20)	(1,133)
Net Gains (Losses)	$ 15,762	$ (1,072)	$ 16,007	$ (1,129)

Investments - Fair Values of Re

Investments - Fair Values of Restricted Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Restricted cash and cash equivalents	$ 855,672	$ 713,338
Restricted investments - fixed maturity at fair value	2,602,094	2,126,216
Total restricted cash, cash equivalents, and investments	$ 3,457,766	$ 2,839,554

Investments - Additional Inform

Investments - Additional Information (Details)	Jun. 09, 2017USD ($)$ / sharesshares	Jun. 30, 2017USD ($)Investmentagreementshares	Jun. 30, 2017USD ($)Investmentagreement	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Investmentagreement	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)Investmentagreement
Investment [Line Items]
Number of securities | Investment		1,695	1,695		1,695		2,125
Proceeds from the sale of investments in available-for-sale securities			$ 623,177,000	$ 585,894,000	$ 1,139,981,000	$ 711,001,000
Securities sold but not yet purchased, at fair value		$ 64,947,000	$ 64,947,000		$ 64,947,000		$ 36,394,000
Number of repurchase agreements | agreement		2	2		2		13
Equity and debt securities, at fair value		$ 31,698	$ 31,698		$ 31,698		$ 160,270,000
Held-to-maturity securities pledged as collateral		33,149,000	33,149,000		33,149,000		175,700,000
Financial instruments sold, not yet purchased, interest expense					12,000
Net realized investment gain			23,455,000	$ 15,099,000	32,070,000	$ 23,074,000
Equity securities, available-for-sale
Investment [Line Items]
Securities sold but not yet purchased, at fair value		$ 64,947,000	$ 64,947,000		$ 64,947,000		$ 36,394,000
Minimum
Investment [Line Items]
Stated interest rate (percentage)		1.37%	1.37%		1.37%		0.75%
Maximum
Investment [Line Items]
Stated interest rate (percentage)							0.90%
NGHC
Investment [Line Items]
Sale of stock (in shares) | shares	10,586,000	10,586,000
Sale of Stock, price per share (usd per share) | $ / shares	$ 20
Sale of Stock, price per share, discount (in percent)	8.30%
Net realized investment gain	$ 68,425,000

Fair Value of Financial Instr40

Fair Value of Financial Instruments - Assets and Financial Liabilities on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	$ 8,389,548	$ 8,007,894
Fair Value of liabilities	199,974	273,504
Equity securities sold but not yet purchased, market
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		36,394
Equity securities sold but not yet purchased, market | Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		160,270
Equity securities sold but not yet purchased, market | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	64,947
Securities sold under agreements to repurchase, at contract value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	31,698
Life settlement contract profit commission
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	5,714	4,940
Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	97,615	71,657
Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		243
U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	355,747	330,654
U.S. government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	13,796	63,732
Municipal bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	935,642	854,170
Foreign government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	193,570	152,876
Finance | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	1,595,070	1,566,288
Industrial | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	2,297,807	2,296,391
Utilities | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	378,753	204,082
Commercial mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	474,305	177,994
Agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	909,779	1,210,385
Non-agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	4,233	61,229
Collateralized loan / debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	510,922	484,405
Asset backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	129,738	29,710
Life settlement contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	396,782	356,856
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	524,829	475,709
Fair Value of liabilities	64,947	36,394
Level 1 | Equity securities sold but not yet purchased, market
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		36,394
Level 1 | Equity securities sold but not yet purchased, market | Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		0
Level 1 | Equity securities sold but not yet purchased, market | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	64,947
Level 1 | Securities sold under agreements to repurchase, at contract value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0
Level 1 | Life settlement contract profit commission
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0	0
Level 1 | Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0	0
Level 1 | Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		0
Level 1 | U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	355,747	330,654
Level 1 | U.S. government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Municipal bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Foreign government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Finance | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Industrial | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Utilities | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Commercial mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Non-agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Collateralized loan / debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Asset backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 1 | Life settlement contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	7,403,026	7,104,005
Fair Value of liabilities	31,698	160,513
Level 2 | Equity securities sold but not yet purchased, market
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		0
Level 2 | Equity securities sold but not yet purchased, market | Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		160,270
Level 2 | Equity securities sold but not yet purchased, market | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0
Level 2 | Securities sold under agreements to repurchase, at contract value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	31,698
Level 2 | Life settlement contract profit commission
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0	0
Level 2 | Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0	0
Level 2 | Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		243
Level 2 | U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 2 | U.S. government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	13,796	63,732
Level 2 | Municipal bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	935,642	854,170
Level 2 | Foreign government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	191,359	149,298
Level 2 | Finance | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	1,581,452	1,559,800
Level 2 | Industrial | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	2,295,722	2,291,351
Level 2 | Utilities | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	378,753	199,503
Level 2 | Commercial mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	450,707	177,994
Level 2 | Agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	909,779	1,186,315
Level 2 | Non-agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	4,233	58,109
Level 2 | Collateralized loan / debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	510,922	484,405
Level 2 | Asset backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	129,738	29,710
Level 2 | Life settlement contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	461,693	428,180
Fair Value of liabilities	103,329	76,597
Level 3 | Equity securities sold but not yet purchased, market
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		0
Level 3 | Equity securities sold but not yet purchased, market | Fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		0
Level 3 | Equity securities sold but not yet purchased, market | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0
Level 3 | Securities sold under agreements to repurchase, at contract value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	0
Level 3 | Life settlement contract profit commission
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	5,714	4,940
Level 3 | Contingent consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities	97,615	71,657
Level 3 | Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of liabilities		0
Level 3 | U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 3 | U.S. government agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 3 | Municipal bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 3 | Foreign government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	2,211	3,578
Level 3 | Finance | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	13,618	6,488
Level 3 | Industrial | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	2,085	5,040
Level 3 | Utilities | Corporate bonds:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	4,579
Level 3 | Commercial mortgage-backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	23,598	0
Level 3 | Agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	24,070
Level 3 | Non-agency backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	3,120
Level 3 | Collateralized loan / debt obligations
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 3 | Asset backed securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	0	0
Level 3 | Life settlement contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	396,782	356,856
Available-for-sale | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	108,830	137,162
Available-for-sale | Level 1 | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	86,584	66,228
Available-for-sale | Level 2 | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	898	49,618
Available-for-sale | Level 3 | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	21,348	21,316
Trading | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	84,574	81,960
Trading | Level 1 | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	82,498	78,827
Trading | Level 2 | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	25	0
Trading | Level 3 | Equity securities, available-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of assets	$ 2,051	$ 3,133

Fair Value of Financial Instr41

Fair Value of Financial Instruments - Changes in Fair Value of Level 3 Financial Assets And Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	$ 376,237	$ 239,094	$ 351,583	$ 201,046
Net income	9,815	23,059	43,630	44,109
Other comprehensive income	318	(776)	(151)	(12,449)
Purchases and issuances	(20,687)	(147)	1,359	2,872
Sales and settlements	(29,131)	(16,858)	(41,809)	8,794
Net transfers into (out of) Level 3	21,812	0	3,752	0
Ending Balance	358,364	244,372	358,364	244,372
Trading Securities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	4,117		3,133
Net income	(74)		(422)
Other comprehensive income	0		0
Purchases and issuances	0		4,484
Sales and settlements	0		(2,134)
Net transfers into (out of) Level 3	(1,992)		(3,010)
Ending Balance	2,051		2,051
Equity securities, available-for-sale
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	17,383	25,556	21,316	37,211
Net income	0	0	0	0
Other comprehensive income	93	(776)	338	(12,449)
Purchases and issuances	76	(16)	76	2
Sales and settlements	(16,748)	0	(16,748)	0
Net transfers into (out of) Level 3	20,544	0	16,366	0
Ending Balance	21,348	24,764	21,348	24,764
Fixed maturity securities, available-for-sale
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	35,173		46,875
Net income	0		0
Other comprehensive income	225		(489)
Purchases and issuances	5,166		7,505
Sales and settlements	(2,312)		(2,775)
Net transfers into (out of) Level 3	3,260		(9,604)
Ending Balance	41,512		41,512
Life settlement contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	397,493	294,573	356,856	264,001
Net income	13,121	28,532	48,616	59,161
Other comprehensive income	0	0	0	0
Purchases and issuances	1,250	11,330	16,473	11,330
Sales and settlements	(15,082)	(30,001)	(25,163)	(30,058)
Net transfers into (out of) Level 3	0		0
Ending Balance	396,782	304,434	396,782	304,434
Life settlement contract profit commission
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	(5,599)	(7,168)	(4,940)	(15,406)
Net income	(115)	(1,886)	(774)	(9,054)
Other comprehensive income	0	0	0	0
Purchases and issuances	0	0	0	0
Sales and settlements	0	0	0	15,406
Net transfers into (out of) Level 3	0	0	0	0
Ending Balance	(5,714)	(9,054)	(5,714)	(9,054)
Contingent consideration
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	(72,330)	(73,867)	(71,657)	(84,760)
Net income	(3,117)	(3,587)	(3,790)	(5,998)
Other comprehensive income	0	0	0	0
Purchases and issuances	(27,179)	(11,461)	(27,179)	(8,460)
Sales and settlements	5,011	13,143	5,011	23,446
Net transfers into (out of) Level 3	0	0	0	0
Ending Balance	$ (97,615)	$ (75,772)	$ (97,615)	$ (75,772)

Fair Value of Financial Instr42

Fair Value of Financial Instruments - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net income	$ 9,815	$ 23,059	$ 43,630	$ 44,109
Gain on investment in life settlement contracts	(1,261)	12,676	7,349	23,406
Life settlement contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net income	13,121	28,532	48,616	59,161
Premiums paid	(13,460)	(13,354)	(38,734)	(25,456)
Other Expenses	(807)	(616)	(1,759)	(1,245)
Gain on investment in life settlement contracts	(1,261)	12,676	7,349	23,406
Life settlement contract profit commission
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net income	$ (115)	$ (1,886)	$ (774)	$ (9,054)

Fair Value of Financial Instr43

Fair Value of Financial Instruments -Fair Value of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
6.125% Notes due 2023 (the 2023 Notes)	$ 248,322	$ 248,185
Revolving credit facility	130,000	130,000
Other	193,487
Fair Value
Revolving credit facility	130,000
Other	193,487
7.25% Subordinated Notes due 2055
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated Debt	145,265	145,202
7.50% Subordinated Notes due 2055
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated Debt	130,739	130,684
2.75% Convertible senior notes due 2044 (the 2044 Notes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible Notes Payable	169,615	166,387
Junior subordinated debentures (the 2035-2037 Notes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debentures	122,072	122,028
Trust preferred securities (the 2033-2037 TPS Notes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debentures	92,786	$ 92,786
Fair Value
Fair Value
6.125% Notes due 2023	246,684
Republic promissory note	53,484
Debt Instrument, Fair Value Disclosure	1,271,586
Fair Value | 7.25% Subordinated Notes due 2055
Fair Value
7.25% Subordinated Notes due 2055	150,120
Fair Value | 7.50% Subordinated Notes due 2055
Fair Value
7.25% Subordinated Notes due 2055	137,268
Fair Value | 2.75% Convertible senior notes due 2044 (the 2044 Notes)
Fair Value
Revolving credit facility	176,132
Fair Value | Junior subordinated debentures (the 2035-2037 Notes)
Fair Value
Junior subordinated debentures	98,600
Fair Value | Trust preferred securities (the 2033-2037 TPS Notes)
Fair Value
Junior subordinated debentures	85,811
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Republic promissory note	52,343
Fair Value
Debt Instrument, Fair Value Disclosure	$ 1,284,629

Fair Value of Financial Instr44

Fair Value of Financial Instruments - Fair Value of Portfolio of Life Insurance Policies (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Life Settlement Contracts, Fair Value Method [Abstract]
Average age of insured (in years)	83 years 1 day	82 years 9 months 1 day
Average life expectancy, months (in months)	103 months	107 months
Average face amount per policy	$ 6,658	$ 6,572
Implicit discount rate (in percentage)	13.00%	12.40%

Fair Value of Financial Instr45

Fair Value of Financial Instruments - Increase or (Decrease) in Carrying Value of Investment in Life Insurance Policies (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Life Settlement Contracts, Fair Value Method [Abstract]
Life expectancy Plus 4 Months	$ 47,918	$ 44,207
Life expectancy Minus 4 Months	47,529	43,492
Discount Plus 1%	32,702	29,881
Discount Minus 1%	$ 36,213	$ 33,155

Fair Value of Financial Instr46

Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	Jun. 09, 2017	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Feb. 24, 2017	Jan. 12, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfer from Level 1 to Level 2		$ 34,318	$ 34,318
Debt instrument, stated interest rate (in percentage)					4.67%	3.45%
Implicit discount rate (in percentage)			13.00%	12.40%
7.25% Subordinated Notes due 2055 | Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate (in percentage)		7.25%	7.25%
7.50% Subordinated Notes due 2055
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate (in percentage)		7.50%	7.50%
2.75% Convertible senior notes due 2044 (the 2044 Notes) | Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate (in percentage)		2.75%	2.75%
6.125% Notes due 2023 | Promissory Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate (in percentage)		6.125%	6.125%
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Implicit discount rate (in percentage)			12.50%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Implicit discount rate (in percentage)			17.50%
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investment in NGHC		$ 36,069	$ 36,069
Discounted Cash Flow Technique | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment discount rate (in percentage)			8.00%
Discounted Cash Flow Technique | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment discount rate (in percentage)			30.00%
NGHC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sale of stock (in shares)	10,586,000	10,586,000
Fair value of investment in NGHC		$ 1,709	$ 1,709

Investment in Life Settlement47

Investment in Life Settlements - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)policy	Jun. 30, 2017Entity	Jun. 30, 2017Contract	Jun. 30, 2017policy	Mar. 31, 2017
Schedule of Cost-method Investments [Line Items]
Capital contributions	$ 7,000		$ 27,000	$ 11,000
Percentage of ownership (in percentage)	50.00%		50.00%
(Loss) gain on investment in life settlement contracts net of profit commission	$ (1,261)	$ 12,676	$ 7,349	$ 23,406
Number of policies with a negative value from discounted cash flow model as of period end (in whole numbers)					18		10	10
Premiums paid for the preceding twelve month period for period ended			974		$ 2,640
Death benefit received			$ 0		$ 0
NGHC
Schedule of Cost-method Investments [Line Items]
Percentage of ownership (in percentage)	1.60%		1.60%						11.50%
LSC Entities
Schedule of Cost-method Investments [Line Items]
Percentage of ownership interest (in percentage)	50.00%		50.00%
Number of entities with ownership interest | Entity						2
NGHC | LSC Entities
Schedule of Cost-method Investments [Line Items]
Percentage of ownership interest (in percentage)	50.00%		50.00%
Life settlement contracts
Schedule of Cost-method Investments [Line Items]
Capital contributions	$ 11,000

Investment in Life Settlement48

Investment in Life Settlements - Expected Maturity Term in Years (Detail) $ in Thousands	Jun. 30, 2017USD ($)Contract	Dec. 31, 2016USD ($)Contract
Number of Life Settlement Contracts
0-1 | Contract	0	0
1-2 | Contract	1	2
2-3 | Contract	9	7
3-4 | Contract	10	10
4-5 | Contract	14	10
Thereafter | Contract	224	225
Total | Contract	258	254
Fair Value
0-1	$ 0	$ 0
1-2	1,935	8,873
2-3	46,545	39,495
3-4	34,553	37,436
4-5	38,547	34,003
Thereafter	275,202	237,049
Total	396,782	356,856
Face Value
0-1	0	0
1-2	2,500	12,500
2-3	90,422	63,000
3-4	81,000	75,422
4-5	85,900	82,900
Thereafter	1,437,413	1,405,414
Total	$ 1,697,235	$ 1,639,236

Investment in Life Settlement49

Investment in Life Settlements - Premiums to be Paid (Detail) - Premiums Due On Life Settlement Contracts $ in Thousands	Jun. 30, 2017USD ($)
Life Insurance Premiums and Related Investment Income [Line Items]
2,017	$ 51,704
2,018	53,042
2,019	51,922
2,020	47,867
2,021	46,039
Thereafter	509,478
Total	$ 760,052

Loss and loss adjustment expe50

Loss and loss adjustment expense reserves (Reconciliation of the beginning and ending balances for unpaid losses and LAE) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Loss and LAE, gross of related reinsurance recoverables at beginning of year	$ 10,630,162	$ 7,516,089	$ 10,140,716	$ 7,208,367
Less: Reinsurance recoverables at beginning of year	4,942,144	3,568,863	4,942,144	3,568,863	$ 4,042,932	$ 3,873,786	$ 2,731,397	$ 2,665,187
Net balance, beginning of year					6,587,230	6,266,930	4,784,692	4,543,180
Incurred related to:
Current year	951,409	758,212	1,772,892	1,397,334
Prior year	73,069	26,181	91,920	102,132
Total incurred during the year	1,024,478	784,393	1,864,812	1,499,466
Paid related to:
Current year	(230,377)	(174,915)	(366,242)	(268,779)
Prior year	(535,417)	(468,347)	(1,148,277)	(947,334)
Total paid during the year	(765,794)	(643,262)	(1,514,519)	(1,216,113)
Loss portfolio transfers	0	143,667	0	312,049
Acquired outstanding loss and loss adjustment reserves	0	463,115	200,802	463,115
Retroactive reinsurance adjustment	(698,069)	0	(698,069)	0
Effect of foreign exchange rates	(59,522)	4,060	(87,411)	73,152
Net balance, end of year	6,207,367	5,528,545	6,207,367	5,528,545
Plus reinsurance recoverables at end of year	4,942,144	3,568,863	4,942,144	3,568,863	$ 4,042,932	$ 3,873,786	$ 2,731,397	$ 2,665,187
Loss and LAE, gross of related reinsurance recoverables at end of period	11,149,511	9,097,408	11,149,511	9,097,408
Loss and LAE, gross of related reinsurance recoverables at end of period	$ 519,349	$ 1,581,319	$ 1,008,795	$ 1,889,041

Debt - Borrowings (Detail)

Debt - Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Revolving credit facility	$ 130,000	$ 130,000
6.125% Notes due 2023 (the 2023 Notes)	248,322	248,185
Secured loan agreements	174,136	75,762
Promissory notes	66,402	118,643
Total debt	1,284,629	1,234,900
5.5% Convertible senior notes due 2021 (the 2021 Notes)
Debt Instrument [Line Items]
Convertible senior notes	5,292	5,223
2.75% Convertible senior notes due 2044 (the 2044 Notes)
Debt Instrument [Line Items]
Convertible senior notes	169,615	166,387
Junior subordinated debentures (the 2035-2037 Notes)
Debt Instrument [Line Items]
Junior subordinated debentures (the 2035-2037 Notes)	122,072	122,028
Trust preferred securities (the 2033-2037 TPS Notes)
Debt Instrument [Line Items]
Junior subordinated debentures (the 2035-2037 Notes)	92,786	92,786
7.25% Subordinated Notes due 2055
Debt Instrument [Line Items]
Subordinate Notes due 2055	145,265	145,202
7.50% Subordinated Notes due 2055
Debt Instrument [Line Items]
Subordinate Notes due 2055	$ 130,739	$ 130,684

Debt - Credit Facilities (Detai

Debt - Credit Facilities (Details) - Line of Credit	Jun. 30, 2017USD ($)
Revolving credit facility
Line of Credit Facility [Line Items]
Limit	$ 175,000,000
Outstanding	174,267,000
Available	733,000
Lloyds | Letter of Credit
Line of Credit Facility [Line Items]
Limit	670,942,000
Outstanding	647,889,000
Available	23,053,000
ING Bank N.V., BHF-BANK Aktiengesellschaft, and Deutsche Bank Netherlands N.V. facilities | Letter of Credit
Line of Credit Facility [Line Items]
Limit	87,715,000
Outstanding	68,724,000
Available	18,991,000
Comerica bank letters of credit | Letter of Credit
Line of Credit Facility [Line Items]
Limit	75,000,000
Outstanding	53,067,000
Available	21,933,000
UniCredit Bank | Letter of Credit
Line of Credit Facility [Line Items]
Limit	100,000,000
Outstanding	100,000,000
Available	0
Other letters of credit, in aggregate | Letter of Credit
Line of Credit Facility [Line Items]
Limit	102,857,000
Outstanding	102,857,000
Available	$ 0

Debt - Interest Expense (Detail

Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Interest expense (net of interest income)	$ 24,229	$ 17,912	$ 47,830	$ 33,786
Convertible Notes Payable
Debt Instrument [Line Items]
Interest expense (net of interest income)	3,224	3,116	6,449	6,232
Convertible Notes Payable | 2021 Notes
Debt Instrument [Line Items]
Interest expense (net of interest income)	117	114	234	229
Senior Notes | 2023 Notes
Debt Instrument [Line Items]
Interest expense (net of interest income)	3,896	3,896	7,793	7,793
Convertible Debt
Debt Instrument [Line Items]
Interest expense (net of interest income)			2,888	3,061
Convertible Debt | 2035-2037 Notes
Debt Instrument [Line Items]
Interest expense (net of interest income)	1,420	1,546
Junior Subordinated Debt | 2033-2037 TPS Notes
Debt Instrument [Line Items]
Interest expense (net of interest income)	1,078	769	2,109	769
Subordinated Debt | 7.25% 2055 Notes
Debt Instrument [Line Items]
Interest expense (net of interest income)	2,750	2,750	5,500	5,500
Subordinated Debt | 7.50% 2055 Notes
Debt Instrument [Line Items]
Interest expense (net of interest income)	2,559	2,559	5,118	5,118
Secured loan agreements
Debt Instrument [Line Items]
Interest expense (net of interest income)	1,493	178	2,827	367
Promissory notes
Debt Instrument [Line Items]
Interest expense (net of interest income)	1,045	1,397	2,708	1,555
Other
Debt Instrument [Line Items]
Interest expense (net of interest income)	3,882	(634)	6,450	(1,414)
Revolving credit facility | Line of Credit
Debt Instrument [Line Items]
Interest expense (net of interest income)	1,529	1,098	3,039	2,254
Funds at Lloyd's facility | Line of Credit
Debt Instrument [Line Items]
Interest expense (net of interest income)	$ 1,236	$ 1,123	$ 2,715	$ 2,322

Debt - Secured Loan Agreement (

Debt - Secured Loan Agreement (Details)	Feb. 24, 2017USD ($)	Jan. 12, 2017subsidiary	Jun. 30, 2017USD ($)	Jun. 30, 2017EUR (€)
Debt Instrument [Line Items]
Number of Subsidiaries | subsidiary		3
Term of the debt instrument (in years)	10 years	10 years
Debt instrument, face amount	$ 11,350,000		$ 97,078,800	€ 73,500,000
Debt instrument, stated interest rate (in percentage)	4.67%	3.45%
Monthly interest expense | $			$ 64,000

Debt - Promissory Note (Details

Debt - Promissory Note (Details) $ in Thousands	Jun. 29, 2017USD ($)	Mar. 30, 2017USD ($)	Apr. 18, 2016USD ($)installment	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Promissory notes				$ 66,402	$ 118,643
Republic Companies
Debt Instrument [Line Items]
Promissory notes			$ 104,685
Number of installments | installment			4
Repayments of debt	$ 25,910	$ 26,171
Repayment of debt, percentage of principal	99.00%

Earnings Per Share - Summary of

Earnings Per Share - Summary of Elements Used in Calculating Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic earnings per share:
Net income attributable to AmTrust common stockholders	$ 5,829	$ 127,156	$ 28,461	$ 211,134
Weighted average common shares outstanding - basic (in shares)	180,679	173,182	175,799	174,346
Net income per AmTrust common share - basic (usd per share)	$ 0.03	$ 0.73	$ 0.16	$ 1.21
Diluted earnings per share:
Weighted average common shares outstanding - basic (in shares)	180,679	173,182	175,799	174,346
Plus: Dilutive effect of stock options, convertible debt, other (in shares)	849	1,865	1,115	1,881
Weighted average common shares outstanding - dilutive (in shares)	181,528	175,047	176,914	176,227
Net income per AmTrust common shares – diluted (usd per share)	$ 0.03	$ 0.73	$ 0.16	$ 1.20

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, limitation on use per year	$ 11,048,000
Operating loss carryforwards, valuation allowance	147,774,000	$ 142,462,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 26,397,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 837,227,000

Related Party Transactions (NGH

Related Party Transactions (NGHC) (Details) $ / shares in Units, $ in Thousands	Jun. 09, 2017USD ($)$ / sharesshares	May 25, 2017USD ($)$ / sharesshares	Jun. 30, 2017USD ($)shareholdercompanyshares	Jun. 30, 2017USD ($)shareholdercompany	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)shareholdercompany	Jun. 30, 2016USD ($)	Mar. 31, 2017
Related Party Transaction [Line Items]
Number of Insurance Companies | company			22	22		22
Number of shareholder | shareholder			2	2		2
Equity in earnings of unconsolidated subsidiaries – related parties						$ 73,488	$ 10,578
Net realized investment gain				$ 23,455	$ 15,099	$ 32,070	23,074
Percentage of ownership in NGHC (in percentage)			50.00%	50.00%		50.00%
NGHC
Related Party Transaction [Line Items]
Equity in earnings of unconsolidated subsidiaries – related parties				$ 1,106	$ 4,802	$ 5,063	$ 10,578
Sale of stock (in shares) | shares	10,586,000		10,586,000
Sale of Stock, price per share (usd per share) | $ / shares	$ 20
Sale of Stock, price per share, discount (in percent)	8.30%
Net realized investment gain	$ 68,425
Percentage of ownership in NGHC (in percentage)			1.60%	1.60%		1.60%		11.50%
Fair value of investment in NGHC			$ 1,709	$ 1,709		$ 1,709
Private Placement | Director
Related Party Transaction [Line Items]
New shares issued | shares		24,096,384
Shares Issued, price per share (usd per share) | $ / shares		$ 12.45
Proceeds from sale of equity		$ 300,000

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	May 01, 2017	Feb. 28, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Gross written premium			$ 2,199,747	$ 2,073,112	$ 4,466,027	$ 4,006,186
Investment income and realized gain (loss)			168,446	$ 124,306	305,942	$ 253,111
AmeriHealth Casualty Insurance Company
Business Acquisition [Line Items]
Percentage of voting Interests acquired (in percentage)		100.00%
Acquisition price		$ 92,786
Reserve guarantee amount		$ 40,000	37,900		37,900
Reserve guarantee amount, subject to percentage loss corridor retained (percentage)		10.00%
Reserve guarantee (in years)		5 years
Gross written premium					56,438
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Acquisition price					36,936
Contingent consideration, liability			8,129		8,129
PDP Group, Inc
Business Acquisition [Line Items]
Percentage of voting Interests acquired (in percentage)	100.00%
Acquisition price	$ 62,422
Payments to acquire businesses	49,801
Contingent consideration, liability	$ 12,621
Investment income and realized gain (loss)			$ 7,652		$ 7,652

Acquisitions - Purchase Price A

Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands	May 01, 2017	Feb. 28, 2017
PDP Group, Inc
Business Acquisition [Line Items]
Cash and investments	$ 11,826
Premium receivables	29,188
Other assets	705
Property and equipment	776
Goodwill and intangible assets	55,586
Total assets	98,081
Accrued expenses and other liabilities	35,659
Total liabilities	35,659
Acquisition price	$ 62,422
AmeriHealth Casualty Insurance Company
Business Acquisition [Line Items]
Cash and investments		$ 275,351
Premium receivables		45,288
Accrued interest and dividends		1,162
Reinsurance recoverable		14,512
Other assets		43,696
Goodwill and intangible assets		17,509
Total assets		397,518
Loss and loss expense reserves		227,865
Unearned premiums		49,284
Accrued expenses and other liabilities		27,583
Total liabilities		304,732
Acquisition price		$ 92,786

Shareholder's Equity and Accumu

Shareholder's Equity and Accumulated Other Comprehensive Income (Loss) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Class of Stock [Line Items]
Net income			$ 78,751	$ 240,994
Net income attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries	$ (6,723)	$ (5,817)	(17,728)	(9,834)
Non-Controlling Interest
Class of Stock [Line Items]
Net income			$ 17,148	$ 9,493

Shareholder's Equity and Accu62

Shareholder's Equity and Accumulated Other Comprehensive Income (Loss) - Ownership Components of Total Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 3,465,613	$ 2,900,235
Net income			78,751	240,994
Unrealized holding gain	$ 49,508	$ 108,373	75,099	191,347
Reclassification adjustment	(19,228)	(7,617)	(30,858)	(8,045)
Foreign currency translation			76,526	(80,007)
Unrealized gain on interest rate swap	28	168	120	287
Share exercises, compensation and other			9,662	4,421
Common share purchase, net			0	(103,164)
Common stock dividends			(63,342)	(62,418)
Preferred stock issuance, net of fees			298,747
Preferred stock dividends	(16,571)	(11,576)	(33,142)	(20,367)
Capital contribution, net			19,298	5,500
Ending Balance	3,896,474	3,207,853	3,896,474	3,207,853
Non-Controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			196,510	176,455
Net income			17,148	9,493
Capital contribution, net			19,298	5,500
Ending Balance	232,956	181,219	232,956	181,219
AmTrust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			3,269,103	2,723,780
Net income			61,603	231,501
Unrealized holding gain			75,099	191,347
Reclassification adjustment			(30,858)	(8,045)
Foreign currency translation			76,526	(80,007)
Unrealized gain on interest rate swap			120	287
Share exercises, compensation and other				0
Common share purchase, net				(103,164)
Common stock dividends			(63,342)	(20,367)
Preferred stock issuance, net of fees			9,662	4,421
Ending Balance	$ 3,663,518	$ 3,026,634	3,663,518	3,026,634
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock issuance, net of fees			0	139,070
Preferred stock | AmTrust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock issuance, net of fees				139,070
Common stock | Non-Controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock dividends				(10,229)
Common stock | AmTrust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common share purchase, net			0
Common stock dividends				$ (52,189)
Preferred stock issuance, net of fees			$ 298,747

Shareholder's Equity and Accu63

Shareholder's Equity and Accumulated Other Comprehensive Income (Loss) - AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			$ 3,465,613	$ 2,900,235
Other comprehensive income (loss) before reclassifications	$ 128,720	$ 126,379	174,706	207,026
Amounts reclassed from accumulated other comprehensive loss	(19,228)	(3,920)	(30,858)	(4,578)
Income tax benefit (expense)	(16,521)	(54,344)	(22,961)	(98,862)
Other comprehensive income, net of tax	92,971	68,115	120,887	103,586
Ending Balance	3,896,474	3,207,853	3,896,474	3,207,853
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(97,806)	(97,921)	(125,722)	(133,392)
Ending Balance	(4,835)	(29,806)	(4,835)	(29,806)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(174,340)	(145,268)	(188,203)	(98,074)
Other comprehensive income (loss) before reclassifications	62,663	(32,809)	76,526	(80,003)
Amounts reclassed from accumulated other comprehensive loss	0	0	0	0
Income tax benefit (expense)	0	0	0	0
Other comprehensive income, net of tax	62,663	(32,809)	76,526	(80,003)
Ending Balance	(111,677)	(178,077)	(111,677)	(178,077)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	79,791	48,035	65,830	(34,511)
Other comprehensive income (loss) before reclassifications	66,029	158,930	98,060	286,588
Amounts reclassed from accumulated other comprehensive loss	(19,228)	(3,920)	(30,858)	(4,578)
Income tax benefit (expense)	(16,521)	(54,254)	(22,961)	(98,708)
Other comprehensive income, net of tax	30,280	100,756	44,241	183,302
Ending Balance	110,071	148,791	110,071	148,791
Interest Rate Swap Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(80)	(581)	(172)	(700)
Other comprehensive income (loss) before reclassifications	28	258	120	441
Amounts reclassed from accumulated other comprehensive loss	0	0	0	0
Income tax benefit (expense)	0	(90)	0	(154)
Other comprehensive income, net of tax	28	168	120	287
Ending Balance	(52)	(413)	(52)	(413)
Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(3,177)	(107)	(3,177)	(107)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassed from accumulated other comprehensive loss	0	0	0	0
Income tax benefit (expense)	0	0	0	0
Other comprehensive income, net of tax	0	0	0	0
Ending Balance	$ (3,177)	$ (107)	$ (3,177)	$ (107)

Segments - Results of Operation

Segments - Results of Operations of Business Segments (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)segment	Jun. 30, 2016USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Gross written premium	$ 2,199,747	$ 2,073,112	$ 4,466,027	$ 4,006,186
Net written premium	1,371,902	1,268,436	2,715,968	2,489,115
Change in unearned premium	8,807	(86,684)	(112,727)	(233,081)
Net earned premium	1,380,709	1,181,752	2,603,241	2,256,034
Loss and loss adjustment expense	(1,024,478)	(784,393)	(1,864,812)	(1,499,466)
Acquisition costs and other underwriting expenses	(373,195)	(294,477)	(701,410)	(566,945)
Operating Expenses	(1,397,673)	(1,078,870)	(2,566,222)	(2,066,411)
Underwriting income (As restated)	(16,964)	102,882	37,019	189,623
Investment income and realized gain (loss)	168,446	124,306	305,942	253,111
Other expenses (As restated)	72,681	65,844	144,621	123,234
Interest expense (As restated)	(199,860)	(134,344)	(362,713)	(263,611)
Interest expense	(24,229)	(17,912)	(47,830)	(33,786)
Foreign currency loss	58,948	(28,995)	76,916	67,228
Foreign currency loss	(1,261)	12,676	7,349	23,406
(Loss) gain on acquisition		39,097
Gain on acquisition	0	39,097	0	48,775
Equity in earnings of unconsolidated subsidiary – related party	19,727	(23,807)	(1,629)	(42,767)
Equity in earnings of unconsolidated subsidiary – related parties	69,531	4,802	73,488	10,578
Net income	29,123	144,549	79,331	241,335
Operating Segments
Segment Reporting Information [Line Items]
Net earned premium	1,380,709	1,181,752	2,603,241	2,256,034
Operating Segments | Small Commercial Business
Segment Reporting Information [Line Items]
Gross written premium	1,123,292	1,060,558	2,380,577	2,126,690
Net written premium	638,762	601,638	1,297,741	1,226,166
Change in unearned premium	(6,898)	(28,660)	(112,252)	(149,094)
Net earned premium	631,864	572,978	1,185,489	1,077,072
Loss and loss adjustment expense	(466,901)	(382,950)	(844,338)	(715,634)
Acquisition costs and other underwriting expenses	(170,179)	(150,149)	(324,820)	(283,681)
Operating Expenses	(637,080)	(533,099)	(1,169,158)	(999,315)
Underwriting income (As restated)	(5,216)	39,879	16,331	77,757
Investment income and realized gain (loss)	30,990	25,745	59,644	58,282
Other expenses (As restated)	32,519	28,193	62,209	55,047
Interest expense (As restated)	(51,496)	(34,321)	(96,670)	(69,968)
Interest expense	(12,403)	(9,180)	(25,496)	(17,935)
Foreign currency loss	0	0	0	0
Foreign currency loss	(859)	6,507	3,917	12,425
(Loss) gain on acquisition		(9,223)
Gain on acquisition				455
Equity in earnings of unconsolidated subsidiary – related party	7,477	(6,256)	(401)	(17,471)
Equity in earnings of unconsolidated subsidiary – related parties	0	0	0	0
Net income	1,012	41,344	19,534	98,592
Operating Segments | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Gross written premium	795,932	651,561	1,528,374	1,181,007
Net written premium	555,486	447,061	1,065,694	784,894
Change in unearned premium	(16,483)	(89,177)	(53,201)	(105,169)
Net earned premium	539,003	357,884	1,012,493	679,725
Loss and loss adjustment expense	(370,840)	(231,328)	(683,444)	(442,264)
Acquisition costs and other underwriting expenses	(140,310)	(78,773)	(258,773)	(151,624)
Operating Expenses	(511,150)	(310,101)	(942,217)	(593,888)
Underwriting income (As restated)	27,853	47,783	70,276	85,837
Investment income and realized gain (loss)	98,178	69,155	185,119	143,539
Other expenses (As restated)	27,719	19,506	53,847	38,676
Interest expense (As restated)	(35,748)	(21,154)	(62,064)	(38,856)
Interest expense	(8,740)	(5,612)	(16,368)	(9,960)
Foreign currency loss	58,948	(28,995)	76,916	67,228
Foreign currency loss	(268)	3,961	2,515	6,900
(Loss) gain on acquisition		48,320
Gain on acquisition				48,320
Equity in earnings of unconsolidated subsidiary – related party	28,595	(19,030)	(3,147)	(31,195)
Equity in earnings of unconsolidated subsidiary – related parties	0	0	0	0
Net income	78,641	113,934	153,262	176,033
Operating Segments | Specialty Program
Segment Reporting Information [Line Items]
Gross written premium	280,523	360,993	557,076	698,489
Net written premium	177,654	219,737	352,533	478,055
Change in unearned premium	32,188	31,153	52,726	21,182
Net earned premium	209,842	250,890	405,259	499,237
Loss and loss adjustment expense	(186,737)	(170,115)	(337,030)	(341,568)
Acquisition costs and other underwriting expenses	(62,706)	(65,555)	(117,817)	(131,640)
Operating Expenses	(249,443)	(235,670)	(454,847)	(473,208)
Underwriting income (As restated)	(39,601)	15,220	(49,588)	26,029
Investment income and realized gain (loss)	443	1,228	1,980	1,517
Other expenses (As restated)	12,443	18,211	28,565	29,511
Interest expense (As restated)	(12,686)	(11,697)	(22,622)	(22,981)
Interest expense	(3,086)	(3,120)	(5,966)	(5,891)
Foreign currency loss	0	0	0	0
Foreign currency loss	(134)	2,208	917	4,081
(Loss) gain on acquisition		0
Gain on acquisition				0
Equity in earnings of unconsolidated subsidiary – related party	(281)	(3,184)	940	(4,857)
Equity in earnings of unconsolidated subsidiary – related parties	0	0	0	0
Net income	(42,902)	18,866	(45,774)	27,409
Corporate and Other
Segment Reporting Information [Line Items]
Gross written premium	0	0	0	0
Net written premium	0	0	0	0
Change in unearned premium	0	0	0	0
Net earned premium	0	0	0	0
Loss and loss adjustment expense	0	0	0	0
Acquisition costs and other underwriting expenses	0	0	0	0
Operating Expenses	0	0	0	0
Underwriting income (As restated)	0	0	0	0
Investment income and realized gain (loss)	38,835	28,178	59,199	49,773
Other expenses (As restated)	0	(66)	0	0
Interest expense (As restated)	(99,930)	(67,172)	(181,357)	(131,806)
Interest expense	0	0	0	0
Foreign currency loss	0	0	0	0
Foreign currency loss	0	0	0	0
(Loss) gain on acquisition		0
Gain on acquisition				0
Equity in earnings of unconsolidated subsidiary – related party	(16,064)	4,663	979	10,756
Equity in earnings of unconsolidated subsidiary – related parties	69,531	4,802	73,488	10,578
Net income	(7,628)	(29,595)	(47,691)	(60,699)
Workers' compensation | Operating Segments
Segment Reporting Information [Line Items]
Net earned premium	487,731	558,598	933,051	1,012,354
Workers' compensation | Operating Segments | Small Commercial Business
Segment Reporting Information [Line Items]
Net earned premium	373,088	358,894	709,413	704,937
Workers' compensation | Operating Segments | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Net earned premium	0	0	0	0
Workers' compensation | Operating Segments | Specialty Program
Segment Reporting Information [Line Items]
Net earned premium	114,643	199,704	223,638	307,417
Warranty | Operating Segments
Segment Reporting Information [Line Items]
Net earned premium	255,810	179,169	470,340	347,502
Warranty | Operating Segments | Small Commercial Business
Segment Reporting Information [Line Items]
Net earned premium	0	0	0	0
Warranty | Operating Segments | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Net earned premium	255,794	179,169	470,321	347,502
Warranty | Operating Segments | Specialty Program
Segment Reporting Information [Line Items]
Net earned premium	16	0	19	0
Other liability | Operating Segments
Segment Reporting Information [Line Items]
Net earned premium	98,329	46,105	196,177	162,648
Other liability | Operating Segments | Small Commercial Business
Segment Reporting Information [Line Items]
Net earned premium	0	0	0	5,249
Other liability | Operating Segments | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Net earned premium	46,198	33,305	89,507	74,018
Other liability | Operating Segments | Specialty Program
Segment Reporting Information [Line Items]
Net earned premium	52,131	12,800	106,670	83,381
Commercial auto and liability, physical damage | Operating Segments
Segment Reporting Information [Line Items]
Net earned premium	124,076	151,278	251,177	280,817
Commercial auto and liability, physical damage | Operating Segments | Small Commercial Business
Segment Reporting Information [Line Items]
Net earned premium	95,556	111,992	196,702	197,896
Commercial auto and liability, physical damage | Operating Segments | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Net earned premium	0	8,684	0	17,176
Commercial auto and liability, physical damage | Operating Segments | Specialty Program
Segment Reporting Information [Line Items]
Net earned premium	28,520	30,602	54,475	65,745
Medical malpractice | Operating Segments
Segment Reporting Information [Line Items]
Net earned premium	53,874	62,733	106,653	106,750
Medical malpractice | Operating Segments | Small Commercial Business
Segment Reporting Information [Line Items]
Net earned premium	0	0	0	0
Medical malpractice | Operating Segments | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Net earned premium	53,874	62,733	106,653	106,750
Medical malpractice | Operating Segments | Specialty Program
Segment Reporting Information [Line Items]
Net earned premium	0	0	0	0
Other | Operating Segments | Small Commercial Business
Segment Reporting Information [Line Items]
Net earned premium			279,374	168,990
Other | Operating Segments | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Net earned premium			346,012	134,279
Other | Operating Segments | Specialty Program
Segment Reporting Information [Line Items]
Net earned premium			20,457	42,694
Other | Corporate and Other
Segment Reporting Information [Line Items]
Net earned premium	360,889	183,869	$ 645,843	$ 345,963
Other | Corporate and Other | Small Commercial Business
Segment Reporting Information [Line Items]
Net earned premium	163,220	102,092
Other | Corporate and Other | Specialty Risk and Extended Warranty
Segment Reporting Information [Line Items]
Net earned premium	183,137	73,993
Other | Corporate and Other | Specialty Program
Segment Reporting Information [Line Items]
Net earned premium	$ 14,532	$ 7,784

Segments - Long Lived Assets an

Segments - Long Lived Assets and Total Assets of Business Segments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 25,328,196	$ 22,614,668

Reinsurance Agreement (Details)

Reinsurance Agreement (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Reinsurance Retention Policy [Line Items]
Loss and loss adjustment expense reserves	$ 11,149,511	$ 11,149,511	$ 10,630,162	$ 10,140,716	$ 9,097,408	$ 7,516,089	$ 7,208,367
Prepaid reinsurance premium	2,168,554	2,168,554		$ 1,994,092
Adverse Loss Development Cover Agreement
Reinsurance Retention Policy [Line Items]
Reinsurance excess of retention amount		400,000
Loss and loss adjustment expense reserves			$ 6,590,000
Payments for Reinsurance		675,000
Prepaid reinsurance premium	50,000	50,000
Loss on reinsurance agreement		59,000
Net present value of obligation from reinsurance agreement		8,949
Administration monitoring fees due		$ 1,000
Reinsurance agreement term		30 years
Net adverse loss development in excess of original pre-tax loss	73,069
Deferred gain recognized in earnings from excess net adverse loss development	14,120
Incremental excess collateral deposited	$ 100,000	$ 100,000
Interest rate paid on unpaid portion of consideration		3.75%
Required payment period on interest		180 days
Adverse Loss Development Cover Agreement | Minimum
Reinsurance Retention Policy [Line Items]
Reinsurance retention amount		$ 1,025,000
Adverse Loss Development Cover Agreement | Maximum
Reinsurance Retention Policy [Line Items]
Reinsurance retention amount		$ 5,963,000