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Condensed Consolidated Unaudited Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Peirce-Phelps, Inc. | Dunphey & Associates Supply Co., Inc. | Common Stock, Class B Common Stock and Preferred Stock | Common Stock, Class B Common Stock and Preferred Stock Peirce-Phelps, Inc. | Common Stock, Class B Common Stock and Preferred Stock Dunphey & Associates Supply Co., Inc. | Paid-In Capital | Paid-In Capital Peirce-Phelps, Inc. | Paid-In Capital Dunphey & Associates Supply Co., Inc. | Accumulated Other Comprehensive Loss | Retained Earnings | Treasury Stock | Non-controlling Interest
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Beginning balance at Dec. 31, 2018 | $ 1,601,713 |  |  | $ 21,167 |  |  | $ 832,121 |  |  | $ (45,968) | $ 627,969 | $ (87,440) | $ 253,864
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  | 37,461,643 |  |  |  |  |  |  |  |  |
Net income | 43,804 |  |  |  |  |  |  |  |  |  | 35,037 |  | 8,767
Other comprehensive income (loss) | 4,195 |  |  |  |  |  |  |  |  | 2,783 |  |  | 1,412
Issuances of non-vested restricted shares of common stock |  |  |  | $ 39 |  |  | (39) |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  | 77,049 |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  |  |  | $ (3) |  |  | 3 |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  |  |  | (5,000) |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan | 4,274 |  |  | $ 15 |  |  | 4,259 |  |  |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  |  |  | 30,715 |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 1,125 |  |  | $ 4 |  |  | 1,121 |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  | 8,925 |  |  |  |  |  |  |  |  |
Retirement of common stock | (428) |  |  | $ (1) |  |  | (427) |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  | (2,985) |  |  |  |  |  |  |  |  |
Share-based compensation | 4,537 |  |  |  |  |  | 4,537 |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (59,965) |  |  |  |  |  |  |  |  |  | (59,965) |  |
Ending balance at Mar. 31, 2019 | 1,599,255 |  |  | $ 21,221 |  |  | 841,575 |  |  | (43,185) | 603,041 | (87,440) | 264,043
Ending balance (in shares) at Mar. 31, 2019 |  |  |  | 37,570,347 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 1,601,713 |  |  | $ 21,167 |  |  | 832,121 |  |  | (45,968) | 627,969 | (87,440) | 253,864
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  | 37,461,643 |  |  |  |  |  |  |  |  |
Net income | 251,369 |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 5,924 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2019 | 1,753,022 |  |  | $ 21,485 |  |  | 894,917 |  |  | (42,040) | 656,187 | (87,440) | 309,913
Ending balance (in shares) at Sep. 30, 2019 |  |  |  | 38,097,236 |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | 1,599,255 |  |  | $ 21,221 |  |  | 841,575 |  |  | (43,185) | 603,041 | (87,440) | 264,043
Beginning balance (in shares) at Mar. 31, 2019 |  |  |  | 37,570,347 |  |  |  |  |  |  |  |  |
Net income | 107,910 |  |  |  |  |  |  |  |  |  | 90,155 |  | 17,755
Other comprehensive income (loss) | 4,652 |  |  |  |  |  |  |  |  | 3,039 |  |  | 1,613
Issuances of non-vested restricted shares of common stock |  |  |  | $ 13 |  |  | (13) |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  | 26,354 |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 1,951 |  |  | $ 9 |  |  | 1,942 |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  | 15,807 |  |  |  |  |  |  |  |  |
Retirement of common stock | (555) |  |  | $ (2) |  |  | (553) |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  | (3,608) |  |  |  |  |  |  |  |  |
Share-based compensation | 4,324 |  |  |  |  |  | 4,324 |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (60,213) |  |  |  |  |  |  |  |  |  | (60,213) |  |
Common stock issued |  |  | $ 7,450 |  |  | $ 25 |  |  | $ 7,425 |  |  |  |
Common stock issued (in shares) |  |  |  |  |  | 50,952 |  |  |  |  |  |  |
Investment in unconsolidated entity | 988 |  |  |  |  |  |  |  |  |  |  |  | 988
Decrease in non-controlling interest in Carrier Enterprise II | (32,400) |  |  |  |  |  | (25,768) |  |  |  |  |  | (6,632)
Ending balance at Jun. 30, 2019 | 1,633,362 |  |  | $ 21,266 |  |  | 828,932 |  |  | (40,146) | 632,983 | (87,440) | 277,767
Ending balance (in shares) at Jun. 30, 2019 |  |  |  | 37,659,852 |  |  |  |  |  |  |  |  |
Net income | 99,655 |  |  |  |  |  |  |  |  |  | 83,480 |  | 16,175
Other comprehensive income (loss) | (2,923) |  |  |  |  |  |  |  |  | (1,894) |  |  | (1,029)
Issuances of non-vested restricted shares of common stock |  |  |  | $ 19 |  |  | (19) |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  | 37,834 |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  |  |  | $ (3) |  |  | 3 |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  |  |  | (5,337) |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 4,529 |  |  | $ 19 |  |  | 4,510 |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  | 36,374 |  |  |  |  |  |  |  |  |
Retirement of common stock | (669) |  |  | $ (2) |  |  | (667) |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  | (4,030) |  |  |  |  |  |  |  |  |
Share-based compensation | 3,706 |  |  |  |  |  | 3,706 |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (60,276) |  |  |  |  |  |  |  |  |  | (60,276) |  |
Common stock issued |  | $ 58,638 |  |  | $ 186 |  |  | $ 58,452 |  |  |  |  |
Common stock issued (in shares) |  |  |  |  | 372,543 |  |  |  |  |  |  |  |
Investment in Peirce-Phelps, Inc. | 17,000 |  |  |  |  |  |  |  |  |  |  |  | 17,000
Ending balance at Sep. 30, 2019 | 1,753,022 |  |  | $ 21,485 |  |  | 894,917 |  |  | (42,040) | 656,187 | (87,440) | 309,913
Ending balance (in shares) at Sep. 30, 2019 |  |  |  | 38,097,236 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 1,714,767 |  |  | $ 21,533 |  |  | 907,877 |  |  | (39,050) | 632,507 | (87,440) | 279,340
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  | 38,194,056 |  |  |  |  |  |  |  |  |
Net income | 36,247 |  |  |  |  |  |  |  |  |  | 30,502 |  | 5,745
Other comprehensive income (loss) | (19,280) |  |  |  |  |  |  |  |  | (12,739) |  |  | (6,541)
Issuances of non-vested restricted shares of common stock |  |  |  | $ 57 |  |  | (57) |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  | 113,765 |  |  |  |  |  |  |  |  |
Common stock contribution to 401(k) plan | 4,543 |  |  | $ 13 |  |  | 4,530 |  |  |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  |  |  | 25,216 |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 2,541 |  |  | $ 9 |  |  | 2,532 |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  | 18,674 |  |  |  |  |  |  |  |  |
Retirement of common stock | (791) |  |  | $ (2) |  |  | (789) |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  | (4,828) |  |  |  |  |  |  |  |  |
Share-based compensation | 6,097 |  |  |  |  |  | 6,097 |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (61,238) |  |  |  |  |  |  |  |  |  | (61,238) |  |
Ending balance at Mar. 31, 2020 | 1,682,886 |  |  | $ 21,610 |  |  | 920,190 |  |  | (51,789) | 601,771 | (87,440) | 278,544
Ending balance (in shares) at Mar. 31, 2020 |  |  |  | 38,346,883 |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 1,714,767 |  |  | $ 21,533 |  |  | 907,877 |  |  | (39,050) | 632,507 | (87,440) | 279,340
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  | 38,194,056 |  |  |  |  |  |  |  |  |
Net income | 266,695 |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (6,335) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2020 | 1,809,938 |  |  | $ 21,660 |  |  | 940,015 |  |  | (43,245) | 658,622 | (87,440) | 320,326
Ending balance (in shares) at Sep. 30, 2020 |  |  |  | 38,448,020 |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | 1,682,886 |  |  | $ 21,610 |  |  | 920,190 |  |  | (51,789) | 601,771 | (87,440) | 278,544
Beginning balance (in shares) at Mar. 31, 2020 |  |  |  | 38,346,883 |  |  |  |  |  |  |  |  |
Net income | 104,242 |  |  |  |  |  |  |  |  |  | 86,578 |  | 17,664
Other comprehensive income (loss) | 8,356 |  |  |  |  |  |  |  |  | 5,521 |  |  | 2,835
Issuances of non-vested restricted shares of common stock |  |  |  | $ 8 |  |  | (8) |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  | 15,500 |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 4,545 |  |  | $ 16 |  |  | 4,529 |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  | 32,073 |  |  |  |  |  |  |  |  |
Retirement of common stock | (1,096) |  |  | $ (4) |  |  | (1,092) |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  | (6,377) |  |  |  |  |  |  |  |  |
Share-based compensation | 5,226 |  |  |  |  |  | 5,226 |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (68,077) |  |  |  |  |  |  |  |  |  | (68,077) |  |
Ending balance at Jun. 30, 2020 | 1,736,082 |  |  | $ 21,630 |  |  | 928,845 |  |  | (46,268) | 620,272 | (87,440) | 299,043
Ending balance (in shares) at Jun. 30, 2020 |  |  |  | 38,388,079 |  |  |  |  |  |  |  |  |
Net income | 126,206 |  |  |  |  |  |  |  |  |  | 106,489 |  | 19,717
Other comprehensive income (loss) | 4,589 |  |  |  |  |  |  |  |  | 3,023 |  |  | 1,566
Issuances of non-vested restricted shares of common stock |  |  |  | $ 10 |  |  | (10) |  |  |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  |  |  | 20,000 |  |  |  |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  |  |  | $ (2) |  |  | 2 |  |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  |  |  | (3,589) |  |  |  |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 8,466 |  |  | $ 28 |  |  | 8,438 |  |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  |  |  | 55,473 |  |  |  |  |  |  |  |  |
Retirement of common stock | (2,755) |  |  | $ (6) |  |  | (2,749) |  |  |  |  |  |
Retirement of common stock (in shares) |  |  |  | (11,943) |  |  |  |  |  |  |  |  |
Share-based compensation | 5,489 |  |  |  |  |  | 5,489 |  |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (68,139) |  |  |  |  |  |  |  |  |  | (68,139) |  |
Ending balance at Sep. 30, 2020 | $ 1,809,938 |  |  | $ 21,660 |  |  | $ 940,015 |  |  | $ (43,245) | $ 658,622 | $ (87,440) | $ 320,326
Ending balance (in shares) at Sep. 30, 2020 |  |  |  | 38,448,020 |  |  |  |  |  |  |  |  |

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