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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Retained Earnings | Cost of Common Stock in Treasury | Accumulated Other Comprehensive Income (Loss), Net
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 672,650 | $ 436,538 | $ 290,824 | $ (56,056) | $ 1,344
Cumulative-effect adjustment at Dec. 31, 2016 | (65) |  | (65) |  |
Balance, adjusted at Dec. 31, 2016 | 672,585 | 436,538 | 290,759 | (56,056) | 1,344
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Net income | 16,206 |  | 16,206 |  |
Other comprehensive loss | (17) |  |  |  | (17)
Issuance of 34,191 and 48,765 common shares under stock based compensation awards for the three months ended on March 31, 2018 and 2017, respectively | 1,878 |  | 721 | 1,157 |
Cost of 15,784 and 900 shares of common stock acquired for treasury for the three months ended on March 31, 2018 and 2017, respectively | (41) |  |  | (41) |
Common stock dividend ($0.22 and $0.18 per share for the three months ended on March 31, 2018 and 2017, respectively) | (4,677) |  | (4,677) |  |
Balance at Mar. 31, 2017 | 685,934 | 436,538 | 303,009 | (54,940) | 1,327
Balance at Dec. 31, 2017 | 718,537 | 436,538 | 339,959 | (54,628) | (3,332)
Cumulative-effect adjustment at Dec. 31, 2017 | 0 |  | 718 |  | (718)
Balance, adjusted at Dec. 31, 2017 | 718,537 | 436,538 | 340,677 | (54,628) | (4,050)
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Net income | 19,116 |  | 19,116 |  |
Other comprehensive loss | (6,885) |  |  |  | (6,885)
Issuance of 34,191 and 48,765 common shares under stock based compensation awards for the three months ended on March 31, 2018 and 2017, respectively | 1,346 |  | 535 | 811 |
Cost of 15,784 and 900 shares of common stock acquired for treasury for the three months ended on March 31, 2018 and 2017, respectively | (785) |  |  | (785) |
Common stock dividend ($0.22 and $0.18 per share for the three months ended on March 31, 2018 and 2017, respectively) | (5,720) |  | (5,720) |  |
Balance at Mar. 31, 2018 | $ 725,609 | $ 436,538 | $ 354,608 | $ (54,602) | $ (10,935)

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