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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) | 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 | $ 809,376,000 | $ 571,155,000 | $ 388,240,000 | $ (30,580,000) | $ (119,439,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 65,232,000 |  | 65,232,000 |  |
Other comprehensive income (loss) | 13,058,000 |  |  | 13,058,000 |
Cash dividends declared : |  |  |  |  |
Common stock at $0.51 per share in 2017 and $0.48 per share in 2016 | (29,672,000) |  | (29,672,000) |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 74,079
Adjustments to Additional Paid in Capital, Other | 0 | (1,249,000) |  |  | $ 1,249,000
Excess tax benefit on share-based compensation | 225,000 | 225,000 |  |  |
Exercise of stock options, net of shares purchased (in shares) |  |  |  |  | 53,715
Exercise of stock options, net of shares purchased | 578,000 | (328,000) |  |  | $ 906,000
Restricted stock awards, net of forfeitures (in shares) |  |  |  |  | 183,399
Restricted stock awards, net of forfeitures | (1,562,000) | (4,506,000) |  |  | $ 2,944,000
Share-based compensation expense | 3,902,000 | $ 3,902,000 |  |  |
Ending Balances (in shares) at Sep. 30, 2016 |  | 68,730,731 |  |  | (6,777,858)
Ending Balances at Sep. 30, 2016 | 861,137,000 | $ 569,199,000 | 423,800,000 | (17,522,000) | $ (114,340,000)
Beginning Balances (in shares) at Dec. 31, 2016 |  | 68,730,731 |  |  | (6,751,179)
Beginning Balances at Dec. 31, 2016 | 865,224,000 | $ 570,382,000 | 437,188,000 | (28,443,000) | $ (113,903,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 71,976,000 |  | 71,976,000 |  |
Other comprehensive income (loss) | 8,064,000 |  |  | 8,064,000 |
Cash dividends declared : |  |  |  |  |
Common stock at $0.51 per share in 2017 and $0.48 per share in 2016 | (31,576,000) |  | (31,576,000) |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 4,848
Adjustments to Additional Paid in Capital, Other | 0 | (82,000) |  |  | $ 82,000
Exercise of stock options, net of shares purchased (in shares) |  |  |  |  | 53,303
Exercise of stock options, net of shares purchased | 18,000 | (885,000) |  |  | $ 903,000
Restricted stock awards, net of forfeitures (in shares) |  |  |  |  | 23,762
Restricted stock awards, net of forfeitures | (2,783,000) | (1,696,000) |  |  | $ (1,087,000)
Share-based compensation expense | 4,031,000 | $ 4,031,000 |  |  |
Ending Balances (in shares) at Sep. 30, 2017 |  | 68,730,731 |  |  | (6,669,266)
Ending Balances at Sep. 30, 2017 | 914,954,000 | $ 571,750,000 | 477,588,000 | (20,379,000) | $ (114,005,000)
Beginning Balances at Jun. 30, 2017 | 1,913,682 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 24,826,000 |  |  |  |
Other comprehensive income (loss) | 1,843,000 |  |  |  |
Ending Balances (in shares) at Sep. 30, 2017 |  | 68,730,731 |  |  | (6,669,266)
Ending Balances at Sep. 30, 2017 | $ 914,954,000 | $ 571,750,000 | $ 477,588,000 | $ (20,379,000) | $ (114,005,000)

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