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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income/(Loss) [Member] | Treasury Stock at Cost [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2014 |  |  |  |  | $ 9,950 | $ 1,634,114 | $ 716,305 | $ (38,331) |
Common stock issued under employee plans |  |  |  |  | 266 |  |  |  | $ 12,818
Common stock repurchased |  |  |  |  |  |  |  |  | (117,752)
Common stock issued for acquisitions |  |  |  |  | 210 | 79,537 |  |  |
Unit amortization, net of forfeitures |  |  |  |  |  | 167,848 |  |  |
Net income |  | $ 92,336 |  |  |  |  | 92,336 |  |
Common stock issued under employee plans and related tax benefits |  |  |  |  |  | (75,468) | (2,956) |  |
Excess tax benefit/(tax deficit) from stock-based compensation | [1] |  |  |  |  | 14,741 |  |  |
Unrealized gains on securities, net of tax |  |  |  |  |  |  |  | 1,389 |
Unrealized gains/(losses) on cash flow hedging activities, net of tax |  |  |  |  |  |  |  | 1,088 |
Foreign currency translation adjustment, net of tax |  | (3,679) | [2] |  |  |  |  | (3,679) |
Balance, end of year at Dec. 31, 2015 |  | 2,492,416 |  |  | 10,426 | 1,820,772 | 805,685 | (39,533) | (104,934)
Common stock issued under employee plans |  |  |  |  |  |  |  |  | 104,375
Common stock repurchased |  | (113,500) |  |  |  |  |  |  | (113,462)
Common stock issued for acquisitions |  |  |  |  |  | (723) |  |  | 13,536
Unit amortization, net of forfeitures |  |  |  |  |  | 189,746 |  |  |
Net income |  | 81,520 |  |  |  |  | 81,520 |  |
Dividends declared, Preferred |  |  |  |  |  |  | (3,906) |  |
Common stock issued under employee plans and related tax benefits |  |  |  |  |  | (159,391) | (6,341) |  |
Excess tax benefit/(tax deficit) from stock-based compensation | [1] |  |  |  |  | (4,904) |  |  |
Issuance of preferred stock |  |  |  | $ 150,000 |  | (4,949) |  |  |
Unrealized gains on securities, net of tax |  |  |  |  |  |  |  | 5,803 |
Unrealized gains/(losses) on cash flow hedging activities, net of tax |  |  |  |  |  |  |  | 7,288 |
Foreign currency translation adjustment, net of tax |  | (12,600) | [2] |  |  |  |  | (12,600) |
Balance, end of year at Dec. 31, 2016 |  | 2,738,408 |  | 150,000 | 10,426 | 1,840,551 | 876,958 | (39,042) | (100,485)
Common stock issued under employee plans |  |  |  |  | 292 |  |  |  | 74,175
Common stock repurchased |  | (13,000) |  |  |  |  |  |  | (12,998)
Common stock issued for acquisitions |  |  |  |  | 28 | 9,324 |  |  |
Unit amortization, net of forfeitures |  |  |  |  |  | 167,908 |  |  |
Dividends declared to equity-award holders |  |  |  |  |  | 3,758 |  |  |
Net income |  | 182,871 |  |  |  |  | 182,871 |  |
Dividends declared, Common |  |  |  |  |  |  | (17,446) |  |
Dividends declared, Preferred |  |  |  |  |  |  | (9,375) |  |
Common stock issued under employee plans and related tax benefits |  |  |  |  |  | (288,152) |  |  |
Other |  |  |  |  |  | (41) | 518 |  |
Unrealized gains on securities, net of tax |  |  |  |  |  |  |  | 4,730 |
Unrealized gains/(losses) on cash flow hedging activities, net of tax |  |  |  |  |  |  |  | (320) |
Foreign currency translation adjustment, net of tax |  | 7,896 | [2] |  |  |  |  | 7,896 |
Balance, end of year at Dec. 31, 2017 |  | $ 2,861,576 |  | $ 150,000 | $ 10,746 | $ 1,733,348 | $ 1,033,526 | $ (26,736) | $ (39,308)
[1] | During the year ended December 31, 2017, we adopted new stock-based compensation guidance. See Note 2 of the Notes to Consolidated Financial Statements for additional information.
[2] | Net of taxes of $3.3 million, $0.3 million, and $0.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.

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