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Consolidated 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, 2015 | $ 1,203,721 | $ 20,841 | $ 602,522 | $ (46,904) | $ 495,276 | $ (114,425) | $ 246,411
Beginning balance (in shares) at Dec. 31, 2015 |  | 35,311,493 |  |  |  |  |
Net income | 235,983 |  |  |  | 182,810 |  | 53,173
Other comprehensive gain (loss) | 5,583 |  |  | 3,374 |  |  | 2,209
Issuances of non-vested restricted shares of common stock (in shares) |  | 183,144 |  |  |  |  |
Issuances of non-vested restricted shares of common stock |  | $ 92 | (92) |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  | (26,000) |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  | $ (13) | 13 |  |  |  |
Common stock contribution to 401(k) plan | 2,348 | $ 10 | 2,338 |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  | 20,045 |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  | 72,482 |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 5,696 | $ 36 | 5,660 |  |  |  |
Retirement of common stock (in shares) |  | (30,761) |  |  |  |  |
Retirement of common stock | (4,018) | $ (15) | (4,003) |  |  |  |
Share-based compensation | 11,848 |  | 11,848 |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (127,604) |  |  |  | (127,604) |  |
Decrease in non-controlling interest in Carrier Enterprise II | (42,909) |  | (25,936) |  |  |  | (16,973)
Distributions to non-controlling interest | (38,900) |  |  |  |  |  | (38,900)
Ending balance at Dec. 31, 2016 | 1,251,748 | $ 20,951 | 592,350 | (43,530) | 550,482 | (114,425) | 245,920
Ending balance (in shares) at Dec. 31, 2016 |  | 35,530,403 |  |  |  |  |
Net income | 257,290 |  |  |  | 208,221 |  | 49,069
Other comprehensive gain (loss) | 14,918 |  |  | 9,309 |  |  | 5,609
Issuances of non-vested restricted shares of common stock (in shares) |  | 176,899 |  |  |  |  |
Issuances of non-vested restricted shares of common stock |  | $ 88 | (88) |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  | (10,000) |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  | $ (5) | 5 |  |  |  |
Common stock contribution to 401(k) plan | 2,428 | $ 8 | 2,420 |  |  |  |
Common stock contribution to 401(k) plan (in shares) |  | 16,389 |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan (in shares) |  | 49,166 |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 5,287 | $ 24 | 5,263 |  |  |  |
Retirement of common stock (in shares) |  | (32,804) |  |  |  |  |
Retirement of common stock | (4,717) | $ (16) | (4,701) |  |  |  |
Share-based compensation | 13,536 |  | 13,536 |  |  |  |
Net proceeds from the sale of Common stock | 247,433 |  | 220,448 |  |  | 26,985 |
Net proceeds from the sale of Common stock (in shares) |  | 1,498,662 |  |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (164,147) |  |  |  | (164,147) |  |
Investment in unconsolidated entity | 12,720 |  |  |  |  |  | 12,720
Decrease in non-controlling interest in Carrier Enterprise II | (42,688) |  | (25,225) |  |  |  | (17,463)
Distributions to non-controlling interest | (42,831) |  |  |  |  |  | (42,831)
Ending balance at Dec. 31, 2017 | 1,550,977 | $ 21,050 | 804,008 | (34,221) | 594,556 | (87,440) | 253,024
Ending balance (in shares) at Dec. 31, 2017 |  | 37,228,715 |  |  |  |  |
Cumulative-effect adjustment at Dec. 31, 2017 |  |  |  | 301 | (301) |  |
Net income | 296,529 |  |  |  | 242,932 |  | 53,597
Other comprehensive gain (loss) | (18,732) |  |  | (12,048) |  |  | (6,684)
Issuances of non-vested restricted shares of common stock (in shares) |  | 142,865 |  |  |  |  |
Issuances of non-vested restricted shares of common stock |  | $ 71 | (71) |  |  |  |
Forfeitures of non-vested restricted shares of common stock (in shares) |  | (10,000) |  |  |  |  |
Forfeitures of non-vested restricted shares of common stock |  | $ (5) | 5 |  |  |  |
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 (in shares) |  | 64,423 |  |  |  |  |
Stock issuances from exercise of stock options and employee stock purchase plan | 7,852 | $ 32 | 7,820 |  |  |  |
Retirement of common stock (in shares) |  | (28,781) |  |  |  |  |
Retirement of common stock | (5,044) | $ (14) | (5,030) |  |  |  |
Share-based compensation | 15,631 |  | 15,631 |  |  |  |
Cash dividends declared and paid on Common and Class B common stock | (209,218) |  |  |  | (209,218) |  |
Common stock issued for Alert Labs Inc. (in shares) |  | 47,103 |  |  |  |  |
Common stock issued for Alert Labs Inc. | 6,846 | $ 24 | 6,822 |  |  |  |
Investment in unconsolidated entity | 752 |  |  |  |  |  | 752
Distributions to non-controlling interest | (46,825) |  |  |  |  |  | (46,825)
Ending balance at Dec. 31, 2018 | $ 1,601,713 | $ 21,167 | $ 832,121 | $ (45,968) | $ 627,969 | $ (87,440) | $ 253,864
Ending balance (in shares) at Dec. 31, 2018 |  | 37,461,643 |  |  |  |  |

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