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Investments (Tables)
6 Months Ended
Jun. 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
June 30, 2020Cost
Credit Losses (1)
GainsLossesValue
U.S. Treasury$56,667  $—  $4,356  $(1) $61,022  
Federal agencies558  —  7  —  565  
States and political subdivision bonds290,985  —  14,483  (135) 305,333  
Foreign government1,763  —  82  —  1,845  
Corporate bonds2,039,050  (1,203) 136,824  (1,232) 2,173,439  
Residential mortgage-backed securities1,096,583  —  53,893  (14) 1,150,462  
Commercial mortgage-backed securities590,047  —  54,361  (989) 643,419  
Asset-backed securities43,015  —  961  (979) 42,997  
Structured securities210,398  —  52  (8,001) 202,449  
Total$4,329,066  $(1,203) $265,019  $(11,351) $4,581,531  
NGHC$4,024,349  $(1,054) $248,284  $(10,821) $4,260,758  
Reciprocal Exchanges304,717  (149) 16,735  (530) 320,773  
Total$4,329,066  $(1,203) $265,019  $(11,351) $4,581,531  
(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 June 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
June 30, 2020Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Due in one year or less$59,142  $59,763  $—  $—  $59,142  $59,763  
Due after one year through five years1,071,646  1,135,486  133,703  140,137  1,205,349  1,275,623  
Due after five years through ten years919,621  984,263  72,474  77,260  992,095  1,061,523  
Due after ten years327,157  331,714  15,678  16,030  342,835  347,744  
Mortgage-backed securities1,646,783  1,749,532  82,862  87,346  1,729,645  1,836,878  
Total$4,024,349  $4,260,758  $304,717  $320,773  $4,329,066  $4,581,531  
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
June 30, 2020Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
Fair
Value
Unrealized
Losses
U.S. Treasury$5,196  $(1) $—  $—  $5,196  $(1) 
States and political subdivision bonds23,423  (135) —  —  23,423  (135) 
Corporate bonds44,373  (1,232) —  —  44,373  (1,232) 
Residential mortgage-backed securities1,794  (14) —  —  1,794  (14) 
Commercial mortgage-backed securities22,382  (989) —  —  22,382  (989) 
Asset-backed securities6,911  (965) 183  (14) 7,094  (979) 
Structured securities130,046  (3,924) 66,928  (4,077) 196,974  (8,001) 
Total$234,125  $(7,260) $67,111  $(4,091) $301,236  $(11,351) 
NGHC$224,513  $(6,907) $63,288  $(3,914) $287,801  $(10,821) 
Reciprocal Exchanges9,612  (353) 3,823  (177) 13,435  (530) 
Total$234,125  $(7,260) $67,111  $(4,091) $301,236  $(11,351) 

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 June 30, 2020
Corporate bondsTotal
Balance, beginning of the period$2,927  $2,927  
Decreases to the allowance for credit losses (1)
(1,724) (1,724) 
Balance, end of the period$1,203  $1,203  

Six Months Ended June 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)
(1,724) (1,724) 
Balance, end of the period$1,203  $1,203  
(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 June 30,Six Months Ended June 30,
2020201920202019
Cash and short-term investments$30  $847  $308  $2,344  
Debt securities, available-for-sale30,491  30,725  62,593  60,192  
Other, net (related parties - three months - $1,042 and $1,919; six months - $(1,483) and $2,173)
1,709  4,733  941  8,241  
Investment income$32,230  $36,305  $63,842  $70,777  
Investment expenses(1,055) (1,174) (2,424) (2,201) 
Net investment income$31,175  $35,131  $61,418  $68,576  
NGHC$29,163  $33,007  $57,223  $64,282  
Reciprocal Exchanges2,012  2,124  4,195  4,294  
Net investment income$31,175  $35,131  $61,418  $68,576  
Net Realized Gains (Losses)
The table below indicates realized gains and losses on investments. Other, net includes realized gains and losses from short-term and other investments and foreign exchange. 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 June 30,Six Months Ended June 30,
2020201920202019
Debt securities, available-for-sale:
Gross gains$1,773  $187  $2,046  $323  
Gross losses(80) (118) (89) (374) 
Expected credit losses1,724  —  (1,203) —  
Net realized gain (loss) on debt securities, available-for-sale3,417  69  754  (51) 
Other, net (1)
1,741  (5,299) (2,457) (5,157) 
Net realized gain (loss) on investments$5,158  $(5,230) $(1,703) $(5,208) 
NGHC$5,511  $(5,274) $(557) $(4,508) 
Reciprocal Exchanges(353) 44  (1,146) (700) 
Net realized gain (loss) on investments$5,158  $(5,230) $(1,703) $(5,208) 
(1) Includes gains and losses on publicly traded equity securities 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
June 30, 2020Amortized
Cost
Fair
Value
PercentageAmortized
Cost
Fair
Value
Percentage
U.S. Treasury$43,785  $47,164  1.1 %$12,882  $13,858  4.3 %
AAA505,813  541,881  12.7 %21,788  23,044  7.2 %
AA, AA+, AA-1,558,195  1,644,162  38.7 %105,625  110,717  34.6 %
A, A+, A-1,034,029  1,090,822  25.6 %100,935  107,450  33.5 %
BBB, BBB+, BBB-858,991  913,538  21.4 %62,587  64,944  20.2 %
BB+ and lower23,536  23,191  0.5 %900  760  0.2 %
Total$4,024,349  $4,260,758  100.0 %$304,717  $320,773  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.
June 30, 2020AAAAA+,
AA,
AA-
A+,A,A-BBB+,
BBB,
BBB-
BB+ or
Lower
Fair
Value
% of
Corporate
Bonds
Portfolio
Financial Institutions— %3.2 %25.9 %11.6 %0.1 %$887,613  40.8 %
Industrials0.6 %3.5 %22.0 %29.8 %0.4 %1,221,976  56.3 %
Utilities/Other— %— %1.6 %1.3 %— %63,850  2.9 %
Total0.6 %6.7 %49.5 %42.7 %0.5 %$2,173,439  100.0 %
NGHC0.3 %5.7 %44.6 %39.7 %0.5 %$1,973,551  90.8 %
Reciprocal Exchanges0.3 %1.0 %4.9 %3.0 %— %199,888  9.2 %
Total0.6 %6.7 %49.5 %42.7 %0.5 %$2,173,439  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:
June 30, 2020December 31, 2019
Cash and cash equivalents$297,282  $135,942  
Restricted cash and cash equivalents37,726  28,521  
Total cash, cash equivalents and restricted cash$335,008  $164,463  

Restricted investments are as follows:
June 30, 2020December 31, 2019
Securities on deposit with state regulatory authorities$81,484  $74,061  
Restricted investments to trusts in certain reinsurance transactions40,845  49,502  
Total restricted investments$122,329  $123,563  
Other Investments
The table below summarizes the composition of other investments:

June 30, 2020December 31, 2019
Equity method investments (related parties - $105,454 and $109,612)
$139,890  $143,511  
Notes receivable (related parties - $130,004 and $129,229)(1)
130,059  129,299  
Long-term Certificates of Deposit (CDs), at cost150  20,150  
Investments, at fair value8,732  9,365  
Investments, at cost or amortized cost8,904  8,962  
Total$287,735  $311,287  
(1) See Note 15, “Related Party Transactions” for additional information.