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Investments (Tables)
9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Available-for-Sale Debt Securities
The following tables summarize the unrealized positions for available-for-sale debt securities, disaggregated by major security type.

AmortizedAllowance forGross UnrealizedFair
September 30, 2020Cost
Credit Losses (1)
GainsLossesValue
U.S. Treasury$55,630 $— $3,551 $— $59,181 
Federal agencies258 — 5 — 263 
States and political subdivision bonds311,092 — 16,653 (92)327,653 
Foreign government1,764 — 98 — 1,862 
Corporate bonds2,038,791 (1,085)131,410 (1,222)2,167,894 
Residential mortgage-backed securities1,078,657 — 47,491 (149)1,125,999 
Commercial mortgage-backed securities572,951 — 57,865 (968)629,848 
Asset-backed securities32,824 — 1,034 (702)33,156 
Structured securities206,707 — 594 (4,024)203,277 
Total$4,298,674 $(1,085)$258,701 $(7,157)$4,549,133 
NGHC$4,002,360 $(935)$254,347 $(6,763)$4,249,009 
Reciprocal Exchanges296,314 (150)4,354 (394)300,124 
Total$4,298,674 $(1,085)$258,701 $(7,157)$4,549,133 
(1) Represents the amount of impairment that has resulted from credit-related factors recorded in net gain (loss) on investments.

AmortizedGross UnrealizedFair
December 31, 2019CostGainsLossesValue
U.S. Treasury$65,037 $1,992 $(23)$67,006 
Federal agencies3,907 8 — 3,915 
States and political subdivision bonds298,345 4,778 (1,441)301,682 
Foreign government1,762 40 — 1,802 
Corporate bonds1,859,736 59,184 (2,357)1,916,563 
Residential mortgage-backed securities1,265,830 15,747 (4,117)1,277,460 
Commercial mortgage-backed securities585,044 27,261 (112)612,193 
Asset-backed securities74,465 1,194 (48)75,611 
Structured securities222,565 226 (2,665)220,126 
Total$4,376,691 $110,430 $(10,763)$4,476,358 
NGHC$4,057,501 $104,951 $(10,343)$4,152,109 
Reciprocal Exchanges319,190 5,479 (420)324,249 
Total$4,376,691 $110,430 $(10,763)$4,476,358 
Available-for-Sale Debt Securities by Contractual Maturity
The amortized cost and fair value of available-for-sale debt securities held as of September 30, 2020, by contractual maturity, are shown in the table below. Actual maturities may differ from contractual maturities because some borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

NGHCReciprocal ExchangesTotal
September 30, 2020Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Due in one year or less$59,932 $60,490 $— $— $59,932 $60,490 
Due after one year through five years1,070,690 1,136,846 67,247 68,826 1,137,937 1,205,672 
Due after five years through ten years1,037,307 1,106,581 63,434 64,359 1,100,741 1,170,940 
Due after ten years295,443 302,797 20,189 20,231 315,632 323,028 
Mortgage-backed securities1,538,988 1,642,295 145,444 146,708 1,684,432 1,789,003 
Total$4,002,360 $4,249,009 $296,314 $300,124 $4,298,674 $4,549,133 
Gross Unrealized Losses
The tables below summarize the gross unrealized losses on debt securities classified as available-for-sale, by length of time the security has continuously been in an unrealized loss position.

Less Than 12 Months12 Months or MoreTotal
September 30, 2020Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
States and political subdivision bonds$16,935 $(92)$— $— $16,935 $(92)
Corporate bonds227,663 (1,222)— — 227,663 (1,222)
Residential mortgage-backed securities59,991 (149)— — 59,991 (149)
Commercial mortgage-backed securities27,134 (968)— — 27,134 (968)
Asset-backed securities6,492 (692)163 (10)6,655 (702)
Structured securities81,862 (1,852)53,520 (2,172)135,382 (4,024)
Total$420,077 $(4,975)$53,683 $(2,182)$473,760 $(7,157)
NGHC$355,598 $(4,669)$49,771 $(2,094)$405,369 $(6,763)
Reciprocal Exchanges64,479 (306)3,912 (88)68,391 (394)
Total$420,077 $(4,975)$53,683 $(2,182)$473,760 $(7,157)

Less Than 12 Months12 Months or MoreTotal
December 31, 2019Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
U.S. Treasury$19,903 $(23)$500 $— $20,403 $(23)
States and political subdivision bonds106,103 (1,415)2,580 (26)108,683 (1,441)
Corporate bonds586,817 (2,253)5,976 (104)592,793 (2,357)
Residential mortgage-backed securities410,484 (4,074)3,983 (43)414,467 (4,117)
Commercial mortgage-backed securities18,250 (105)748 (7)18,998 (112)
Asset-backed securities5,406 (29)920 (19)6,326 (48)
Structured securities40,979 (94)109,880 (2,571)150,859 (2,665)
Total$1,187,942 $(7,993)$124,587 $(2,770)$1,312,529 $(10,763)
NGHC$1,104,244 $(7,654)$117,681 $(2,689)$1,221,925 $(10,343)
Reciprocal Exchanges83,698 (339)6,906 (81)90,604 (420)
Total$1,187,942 $(7,993)$124,587 $(2,770)$1,312,529 $(10,763)
Debt Securities, Available-for-sale, Allowance for Credit Loss
The following tables display the roll forward of the allowance for credit losses:

Three Months Ended September 30, 2020
Corporate bondsTotal
Balance, beginning of the period$1,203 $1,203 
Decreases to the allowance for credit losses (1)
(100)(100)
Decreases to the allowance for credit losses for securities sold (1)
(18)(18)
Balance, end of the period$1,085 $1,085 

Nine Months Ended September 30, 2020
Corporate bondsTotal
Balance, beginning of the period$— $— 
Additions to the allowance for credit losses on securities not previously recorded (1)
2,927 2,927 
Decreases to the allowance for credit losses (1)
(1,824)(1,824)
Decreases to the allowance for credit losses for securities sold (1)
(18)(18)
Balance, end of the period$1,085 $1,085 
(1) Current period increases or decreases for expected losses are recorded in net gain (loss) on investments.
Investment Income
The components of net investment income consisted of the following:

Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Cash and short-term investments$110 $1,123 $418 $3,467 
Debt securities, available-for-sale29,526 31,439 92,119 91,631 
Other, net (related parties - three months - $(1,425) and $(10); nine months - $(2,908) and $2,163)
497 2,271 1,438 10,512 
Investment income$30,133 $34,833 $93,975 $105,610 
Investment expenses(1,229)(1,093)(3,653)(3,294)
Net investment income$28,904 $33,740 $90,322 $102,316 
NGHC$26,650 $31,580 $83,873 $95,862 
Reciprocal Exchanges2,254 2,160 6,449 6,454 
Net investment income$28,904 $33,740 $90,322 $102,316 
Net Realized Gains (Losses)
The table below indicates realized gains and losses on investments. Purchases and sales of investments are recorded on a trade date basis. Realized gains and losses are determined based on the specific identification method.

Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Debt securities, available-for-sale:
Gross gains$19,652 $3,598 $21,698 $3,921 
Gross losses(259)(1,712)(348)(2,086)
Expected credit losses100 — (1,103)— 
Net realized gain on debt securities, available-for-sale19,493 1,886 20,247 1,835 
Other, net (1)
346 (305)(2,111)(5,462)
Net realized gain (loss) on investments$19,839 $1,581 $18,136 $(3,627)
NGHC$6,736 $1,718 $6,179 $(2,790)
Reciprocal Exchanges13,103 (137)11,957 (837)
Net realized gain (loss) on investments$19,839 $1,581 $18,136 $(3,627)
(1) Includes gains and losses on publicly traded equity securities, other investments, and foreign currency.
Credit Quality of Investments
The tables below summarize the credit quality of debt securities, as rated by Standard & Poor’s (“S&P”). If a security is not rated by S&P, an S&P equivalent is determined based on ratings from similar rating agencies. Securities that are not rated are included in the “BB+ and lower” category.

NGHCReciprocal Exchanges
September 30, 2020Amortized
Cost
Fair
Value
PercentageAmortized
Cost
Fair
Value
Percentage
U.S. Treasury$41,164 $44,386 1.0 %$14,466 $14,795 4.9 %
AAA502,797 544,772 12.8 %20,970 21,114 7.0 %
AA, AA+, AA-1,463,849 1,547,498 36.6 %155,194 156,645 52.3 %
A, A+, A-1,109,928 1,166,023 27.4 %39,081 40,077 13.4 %
BBB, BBB+, BBB-856,831 918,836 21.6 %65,723 66,758 22.2 %
BB+ and lower27,791 27,494 0.6 %880 735 0.2 %
Total$4,002,360 $4,249,009 100.0 %$296,314 $300,124 100.0 %

NGHCReciprocal Exchanges
December 31, 2019Amortized
Cost
Fair
Value
PercentageAmortized
Cost
Fair
Value
Percentage
U.S. Treasury$52,108 $53,599 1.3 %$12,929 $13,407 4.1 %
AAA515,869 537,508 12.9 %20,947 21,555 6.6 %
AA, AA+, AA-1,677,787 1,697,220 40.9 %120,113 121,720 37.5 %
A, A+, A-954,312 976,468 23.5 %116,747 119,041 36.7 %
BBB, BBB+, BBB-795,594 823,239 19.8 %48,021 48,093 14.8 %
BB+ and lower61,831 64,075 1.6 %433 433 0.3 %
Total$4,057,501 $4,152,109 100.0 %$319,190 $324,249 100.0 %

The tables below summarize the investment quality of the corporate bond holdings and industry concentrations.
September 30, 2020AAAAA+,
AA,
AA-
A+,A,A-BBB+,
BBB,
BBB-
BB+ or
Lower
Fair
Value
% of
Corporate
Bonds
Portfolio
Financial Institutions— %2.4 %23.0 %14.1 %0.1 %$858,974 39.6 %
Industrials0.3 %3.3 %25.5 %28.1 %0.4 %1,247,187 57.6 %
Utilities/Other— %— %1.6 %1.2 %— %61,733 2.8 %
Total0.3 %5.7 %50.1 %43.4 %0.5 %$2,167,894 100.0 %
NGHC0.3 %5.7 %48.3 %40.3 %0.5 %$2,060,258 95.1 %
Reciprocal Exchanges— %— %1.8 %3.1 %— %107,636 4.9 %
Total0.3 %5.7 %50.1 %43.4 %0.5 %$2,167,894 100.0 %
December 31, 2019AAAAA+,
AA,
AA-
A+,A,A-BBB+,
BBB,
BBB-
BB+ or
Lower
Fair
Value
% of
Corporate
Bonds
Portfolio
Financial Institutions— %3.6 %25.0 %12.1 %0.3 %$785,910 41.0 %
Industrials0.7 %2.7 %24.1 %29.0 %0.1 %1,083,959 56.6 %
Utilities/Other— %— %1.0 %1.4 %— %46,694 2.4 %
Total0.7 %6.3 %50.1 %42.5 %0.4 %$1,916,563 100.0 %
NGHC0.3 %5.1 %44.0 %40.0 %0.4 %$1,720,962 89.8 %
Reciprocal Exchanges0.4 %1.2 %6.1 %2.5 %— %195,601 10.2 %
Total0.7 %6.3 %50.1 %42.5 %0.4 %$1,916,563 100.0 %
Cash, Cash Equivalents, Restricted Cash and Restricted Investments
Cash, cash equivalents, and restricted cash are as follows:
September 30, 2020December 31, 2019
Cash and cash equivalents$188,282 $135,942 
Restricted cash and cash equivalents63,061 28,521 
Total cash, cash equivalents and restricted cash$251,343 $164,463 

Restricted investments are as follows:
September 30, 2020December 31, 2019
Securities on deposit with state regulatory authorities$83,876 $74,061 
Restricted investments to trusts in certain reinsurance transactions36,324 49,502 
Total restricted investments$120,200 $123,563 
Other Investments
The table below summarizes the composition of other investments:

September 30, 2020December 31, 2019
Equity method investments (related parties - $100,809 and $109,612)
$136,935 $143,511 
Notes receivable (related parties - $130,784 and $129,229)(1)
130,832 129,299 
Long-term Certificates of Deposit (CDs), at cost150 20,150 
Investments, at fair value5,987 9,365 
Investments, at cost or amortized cost8,962 8,962 
Total$282,866 $311,287 
(1) See Note 15, “Related Party Transactions” for additional information.