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Condensed Consolidated Unaudited Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock, Class B Common Stock and Preferred Stock | Paid-In Capital | Accumulated Other Comprehensive Loss | Retained Earnings | Treasury Stock | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 1,550,977 | $ 21,050 | $ 804,008 | $ (34,221) | $ 594,556 | $ (87,440) | $ 253,024
Beginning balance (in shares) at Dec. 31, 2017 |  | 37,228,715 |  |  |  |  |
Cumulative-effect adjustment at Dec. 31, 2017 |  |  |  | 301 | (301) |  |
Net income | 42,377 |  |  |  | 34,219 |  | 8,158
Other comprehensive income (loss) | (5,741) |  |  | (3,649) |  |  | (2,092)
Issuances of non-vested restricted shares of common stock |  | $ 46 | (46) |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  | 91,609 |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  | $ (2) | 2 |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  | (3,000) |  |  |  |  |
Common stock contribution to 401(k) plan | 2,945 | $ 9 | 2,936 |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  | 17,318 |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 4,341 | $ 19 | 4,322 |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  | 37,130 |  |  |  |  |
Retirement of common stock | (914) | $ (3) | (911) |  |  |  |
Retirement of common stock (in shares) |  | (5,041) |  |  |  |  |
Share-based compensation | 4,400 |  | 4,400 |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (46,581) |  |  |  | (46,581) |  |
Distributions to non-controlling interest | (2,178) |  |  |  |  |  | (2,178)
Ending balance at Mar. 31, 2018 | 1,549,626 | $ 21,119 | 814,711 | (37,569) | 581,893 | (87,440) | 256,912
Ending balance (in shares) at Mar. 31, 2018 |  | 37,366,731 |  |  |  |  |
Beginning balance at Dec. 31, 2017 | 1,550,977 | $ 21,050 | 804,008 | (34,221) | 594,556 | (87,440) | 253,024
Beginning balance (in shares) at Dec. 31, 2017 |  | 37,228,715 |  |  |  |  |
Cumulative-effect adjustment at Dec. 31, 2017 |  |  |  | 301 | (301) |  |
Net income | 150,641 |  |  |  |  |  |
Other comprehensive income (loss) | (10,302) |  |  |  |  |  |
Ending balance at Jun. 30, 2018 | 1,601,994 | $ 21,120 | 817,559 | (40,459) | 617,666 | (87,440) | 273,548
Ending balance (in shares) at Jun. 30, 2018 |  | 37,367,632 |  |  |  |  |
Beginning balance at Mar. 31, 2018 | 1,549,626 | $ 21,119 | 814,711 | (37,569) | 581,893 | (87,440) | 256,912
Beginning balance (in shares) at Mar. 31, 2018 |  | 37,366,731 |  |  |  |  |
Net income | 108,264 |  |  |  | 89,957 |  | 18,307
Other comprehensive income (loss) | (4,561) |  |  | (2,890) |  |  | (1,671)
Issuances of non-vested restricted shares of common stock |  | $ 4 | (4) |  |  |  |
Issuances of non-vested restricted shares of common stock (in shares) |  | 8,500 |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  | $ (2) | 2 |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  | (5,000) |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 1,601 | $ 6 | 1,595 |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  | 11,935 |  |  |  |  |
Retirement of common stock | (2,499) | $ (7) | (2,492) |  |  |  |
Retirement of common stock (in shares) |  | (14,534) |  |  |  |  |
Share-based compensation | 3,747 |  | 3,747 |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (54,184) |  |  |  | (54,184) |  |
Ending balance at Jun. 30, 2018 | 1,601,994 | $ 21,120 | 817,559 | (40,459) | 617,666 | (87,440) | 273,548
Ending balance (in shares) at Jun. 30, 2018 |  | 37,367,632 |  |  |  |  |
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 | 151,714 |  |  |  |  |  |
Other comprehensive income (loss) | 8,847 |  |  |  |  |  |
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 |  |  |  |  |
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 for Dunphey & Associates Supply Co., Inc. | 7,450 | $ 25 | 7,425 |  |  |  |
Common stock issued for Dunphey & Associates Supply Co., Inc. (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 |  |  |  |  |

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