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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Retained earnings | Accumulated other comprehensive income (loss) | Treasury stock
--- | --- | --- | --- | --- | ---
Beginning Balances (in shares) at Dec. 31, 2015 |  | 68,730,731 |  |  | (7,089,051)
Beginning Balances at Dec. 31, 2015 | $ 809,376 | $ 571,155 | $ 388,240 | $ (30,580) | $ (119,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 42,382 |  | 42,382 |  |
Other comprehensive income (loss) | 12,892 |  |  | 12,892 |
Cash dividends declared : |  |  |  |  |
Common stock at $0.34 per share in 2017 and $0.32 per share in 2016 | (19,729) |  | (19,729) |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 57,575
Adjustments to Additional Paid in Capital, Other | 0 | (971) |  |  | $ 971
Excess tax benefit on share-based compensation | 156 | 156 |  |  |
Exercise of stock options, net of shares purchased (in shares) |  |  |  |  | 45,928
Exercise of stock options, net of shares purchased | 597 | (177) |  |  | $ 774
Restricted stock awards, net of forfeitures (in shares) |  |  |  |  | 214,346
Restricted stock awards, net of forfeitures | (1,347) | (4,872) |  |  | $ 3,525
Share-based compensation expense | 2,396 | $ 2,396 |  |  |
Ending Balances (in shares) at Jun. 30, 2016 |  | 68,730,731 |  |  | (6,771,202)
Ending Balances at Jun. 30, 2016 | 846,723 | $ 567,687 | 410,893 | (17,688) | $ (114,169)
Beginning Balances (in shares) at Dec. 31, 2016 |  | 68,730,731 |  |  | (6,751,179)
Beginning Balances at Dec. 31, 2016 | 865,224 | $ 570,382 | 437,188 | (28,443) | $ (113,903)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 47,150 |  | 47,150 |  |
Other comprehensive income (loss) | 6,221 |  |  | 6,221 |
Cash dividends declared : |  |  |  |  |
Common stock at $0.34 per share in 2017 and $0.32 per share in 2016 | (21,088) |  | (21,088) |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 1,484
Adjustments to Additional Paid in Capital, Other | 0 | (25) |  |  | $ 25
Exercise of stock options, net of shares purchased (in shares) |  |  |  |  | 39,062
Exercise of stock options, net of shares purchased | 198 | (462) |  |  | $ 660
Restricted stock awards, net of forfeitures (in shares) |  |  |  |  | 120,973
Restricted stock awards, net of forfeitures | (2,554) | (3,559) |  |  | $ 1,005
Share-based compensation expense | 2,966 | $ 2,966 |  |  |
Ending Balances (in shares) at Jun. 30, 2017 |  | 68,730,731 |  |  | (6,589,660)
Ending Balances at Jun. 30, 2017 | $ 898,117 | $ 569,302 | $ 463,250 | $ (22,222) | $ (112,213)

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