Debt and Equity Securities | Note 4 – Debt and Equity Securities Investments in debt securities, classified as available-for-sale, are as follows: (in thousands) Amortized Gross unrealized Estimated Gains Losses June 30, 2018 U.S. Treasury bonds $ 172,266 $ 512 $ (3,058 ) $ 169,720 Municipal bonds 1,106,608 5,841 (18,014 ) 1,094,435 Foreign government bonds 148,289 305 (2,674 ) 145,920 Governmental agency bonds 262,355 463 (5,798 ) 257,020 Governmental agency mortgage-backed securities 2,475,714 2,985 (39,449 ) 2,439,250 U.S. corporate debt securities 761,229 2,332 (14,637 ) 748,924 Foreign corporate debt securities 268,118 862 (4,406 ) 264,574 $ 5,194,579 $ 13,300 $ (88,036 ) $ 5,119,843 December 31, 2017 U.S. Treasury bonds $ 173,049 $ 2,199 $ (1,250 ) $ 173,998 Municipal bonds 1,031,146 12,185 (7,394 ) 1,035,937 Foreign government bonds 170,220 489 (1,221 ) 169,488 Governmental agency bonds 212,731 1,061 (2,322 ) 211,470 Governmental agency mortgage-backed securities 2,172,377 3,168 (16,588 ) 2,158,957 U.S. corporate debt securities 734,409 11,768 (2,962 ) 743,215 Foreign corporate debt securities 256,430 4,145 (956 ) 259,619 $ 4,750,362 $ 35,015 $ (32,693 ) $ 4,752,684 Sales of debt securities resulted in realized gains of $0.7 million and $1.3 million, realized losses of $2.6 million and $3.8 million, and proceeds of $186.6 million and $342.3 million for the three and six months ended June 30, 2018, respectively, and realized gains of $1.3 million and $2.9 million, realized losses of $0.3 million and $3.5 million, and proceeds of $139.6 million and $294.0 million for the three and six months ended June 30, 2017, respectively. Gross unrealized losses on investments in debt securities are as follows: Less than 12 months 12 months or longer Total (in thousands) Estimated fair value Unrealized losses Estimated fair value Unrealized losses Estimated fair value Unrealized losses June 30, 2018 U.S. Treasury bonds $ 111,297 $ (1,927 ) $ 34,287 $ (1,131 ) $ 145,584 $ (3,058 ) Municipal bonds 473,525 (5,656 ) 227,275 (12,358 ) 700,800 (18,014 ) Foreign government bonds 72,240 (1,265 ) 35,537 (1,409 ) 107,777 (2,674 ) Governmental agency bonds 118,367 (2,185 ) 116,299 (3,613 ) 234,666 (5,798 ) Governmental agency mortgage-backed securities 1,079,083 (19,034 ) 757,050 (20,415 ) 1,836,133 (39,449 ) U.S. corporate debt securities 511,761 (11,007 ) 60,723 (3,630 ) 572,484 (14,637 ) Foreign corporate debt securities 179,776 (3,833 ) 21,263 (573 ) 201,039 (4,406 ) $ 2,546,049 $ (44,907 ) $ 1,252,434 $ (43,129 ) $ 3,798,483 $ (88,036 ) December 31, 2017 U.S. Treasury bonds $ 78,605 $ (511 ) $ 37,498 $ (739 ) $ 116,103 $ (1,250 ) Municipal bonds 279,292 (1,714 ) 226,895 (5,680 ) 506,187 (7,394 ) Foreign government bonds 98,942 (972 ) 6,678 (249 ) 105,620 (1,221 ) Governmental agency bonds 55,707 (409 ) 93,737 (1,913 ) 149,444 (2,322 ) Governmental agency mortgage-backed securities 671,871 (4,868 ) 774,959 (11,720 ) 1,446,830 (16,588 ) U.S. corporate debt securities 171,817 (1,568 ) 60,724 (1,394 ) 232,541 (2,962 ) Foreign corporate debt securities 81,525 (821 ) 5,697 (135 ) 87,222 (956 ) $ 1,437,759 $ (10,863 ) $ 1,206,188 $ (21,830 ) $ 2,643,947 $ (32,693 ) Based on the Company’s review of its debt securities in an unrealized loss position at June 30, 2018, it determined that the losses were primarily the result of changes in interest rates, which were considered to be temporary, rather than a deterioration in credit quality. The Company does not intend to sell and it is not more likely than not that the Company will be required to sell these securities prior to recovering their amortized cost. As such, the Company does not consider these securities to be other-than-temporarily impaired at June 30, 2018. Investments in debt securities at June 30, 2018, by contractual maturities, are as follows: (in thousands) Due in one year or less Due after one through five years Due after five through ten years Due after ten years Total U.S. Treasury bonds Amortized cost $ 31,771 $ 48,201 $ 40,899 $ 51,395 $ 172,266 Estimated fair value $ 31,647 $ 47,291 $ 40,044 $ 50,738 $ 169,720 Municipal bonds Amortized cost $ 73,033 $ 295,362 $ 300,483 $ 437,730 $ 1,106,608 Estimated fair value $ 73,044 $ 295,138 $ 297,958 $ 428,295 $ 1,094,435 Foreign government bonds Amortized cost $ 19,550 $ 101,513 $ 11,382 $ 15,844 $ 148,289 Estimated fair value $ 19,520 $ 100,893 $ 11,081 $ 14,426 $ 145,920 Governmental agency bonds Amortized cost $ 31,852 $ 100,514 $ 76,537 $ 53,452 $ 262,355 Estimated fair value $ 31,763 $ 98,014 $ 75,784 $ 51,459 $ 257,020 U.S. corporate debt securities Amortized cost $ 21,982 $ 356,138 $ 311,501 $ 71,608 $ 761,229 Estimated fair value $ 21,951 $ 351,759 $ 305,639 $ 69,575 $ 748,924 Foreign corporate debt securities Amortized cost $ 20,650 $ 152,492 $ 82,081 $ 12,895 $ 268,118 Estimated fair value $ 20,639 $ 151,135 $ 80,145 $ 12,655 $ 264,574 Total debt securities excluding mortgage-backed securities Amortized cost $ 198,838 $ 1,054,220 $ 822,883 $ 642,924 $ 2,718,865 Estimated fair value $ 198,564 $ 1,044,230 $ 810,651 $ 627,148 $ 2,680,593 Total mortgage-backed securities Amortized cost $ 2,475,714 Estimated fair value $ 2,439,250 Total debt securities Amortized cost $ 5,194,579 Estimated fair value $ 5,119,843 Mortgage-backed securities, which include contractual terms to maturity, are not categorized by contractual maturity as borrowers may have the right to call or prepay obligations with, or without, call or prepayment penalties. Investments in equity securities are as follows: (in thousands) Cost Estimated fair value June 30, 2018 Preferred stocks $ 18,292 $ 17,946 Common stocks 378,396 420,749 $ 396,688 $ 438,695 December 31, 2017 Preferred stocks $ 19,233 $ 18,990 Common stocks 394,439 447,526 $ 413,672 $ 466,516 The Company adopted new accounting guidance on January 1, 2018, which requires investments in equity securities with readily determinable fair values to be measured at fair value with changes in fair value recognized through net income. See Note 1 Basis of Condensed Consolidated Financial Statements for further discussion of the new guidance. Net gains of $7.7 million and $1.8 million were recognized for the three and six months ended June 30, 2018, respectively, as a result of changes in the fair values of equity securities. Included in net gains during the three and six months ended June 30, 2018, were net unrealized gains of $5.6 million and $1.8 million, respectively, related to equity securities still held at June 30, 2018. For the three and six months ended June 30, 2017, sales of equity securities resulted in realized gains of $15.4 million and $17.2 million and realized losses of $1.6 million and $1.7 million, respectively. The composition of the investment portfolio at June 30, 2018, by credit rating, is as follows: A- or higher BBB+ to BBB- Non-Investment Grade Total (in thousands, except percentages) Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Debt securities: U.S. Treasury bonds $ 169,720 100.0 $ — — $ — — $ 169,720 100.0 Municipal bonds 1,011,354 92.4 59,805 5.5 23,276 2.1 1,094,435 100.0 Foreign government bonds 117,244 80.3 23,596 16.2 5,080 3.5 145,920 100.0 Governmental agency bonds 257,020 100.0 — — — — 257,020 100.0 Governmental agency mortgage-backed securities 2,439,250 100.0 — — — — 2,439,250 100.0 U.S. corporate debt securities 301,840 40.3 245,345 32.8 201,739 26.9 748,924 100.0 Foreign corporate debt securities 122,937 46.5 110,837 41.9 30,800 11.6 264,574 100.0 Total debt securities 4,419,365 86.3 439,583 8.6 260,895 5.1 5,119,843 100.0 Preferred stocks 58 0.3 13,106 73.0 4,782 26.7 17,946 100.0 Total $ 4,419,423 86.0 $ 452,689 8.8 $ 265,677 5.2 $ 5,137,789 100.0 As of June 30, 2018, the estimated fair value of total debt securities included $155.4 million of bank loans, of which $141.9 million was non-investment grade; $84.5 million of high yield corporate debt securities, all of which was non-investment grade; and $84.4 million of emerging market debt securities, of which $11.2 million was non-investment grade. The composition of the debt securities portfolio in an unrealized loss position at June 30, 2018, by credit rating, is as follows: A- or higher BBB+ to BBB- Non-Investment Grade Total (in thousands, except percentages) Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage Estimated fair value Percentage U.S. Treasury bonds $ 145,584 100.0 $ — — $ — — $ 145,584 100.0 Municipal bonds 654,260 93.4 36,534 5.2 10,006 1.4 700,800 100.0 Foreign government bonds 79,130 73.4 23,567 21.9 5,080 4.7 107,777 100.0 Governmental agency bonds 234,666 100.0 — — — — 234,666 100.0 Governmental agency mortgage-backed securities 1,836,133 100.0 — — — — 1,836,133 100.0 U.S. corporate debt securities 255,973 44.7 200,971 35.1 115,540 20.2 572,484 100.0 Foreign corporate debt securities 82,024 40.8 94,505 47.0 24,510 12.2 201,039 100.0 Total $ 3,287,770 86.6 $ 355,577 9.4 $ 155,136 4.0 $ 3,798,483 100.0 As of June 30, 2018, the estimated fair value of total debt securities in an unrealized loss position included $74.4 million of bank loans, of which $70.2 million was non-investment grade; $64.7 million of high yield corporate debt securities, all of which was non-investment grade; and $72.7 million of emerging market debt securities, of which $10.2 million was non-investment grade. The credit ratings in the above tables reflect published ratings obtained from globally recognized securities rating agencies. If a security was rated differently among the rating agencies, the lowest rating was selected. Governmental agency mortgage-backed securities are not rated by any of the ratings agencies; however, these securities have been included in the above table in the “A- or higher” category because the payments of principal and interest are guaranteed by the governmental agency that issued the security. |