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CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Capital Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Balance, Beginning of Period at Dec. 31, 2016 |  |  |  |  | $ (92,262)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | $ 47,928 |  |  |  |
Other comprehensive income (loss) | 16,772 |  |  |  |
Balance, End of Period at Jun. 30, 2017 |  |  |  |  | (75,490)
Balance, Beginning of Period at Dec. 31, 2017 | 766,573 | $ 18,255 | $ 128,933 | $ 684,540 | (65,155)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 43,465 | 0 | 0 | 43,465 | 0
Other comprehensive income (loss) | (7,109) | 0 | 0 | 0 | (7,109)
Stock options exercised | 698 | 18 | 680 | 0 | 0
Stock issued to directors | 0 | 11 | (11) | 0 | 0
Shares issued for employees stock purchase plan | 558 | 6 | 552 | 0 | 0
Shares issued for vested restricted stock units, net of cancellations for tax withholding | (6,427) | 113 | (6,540) | 0 | 0
Value of capital stock repurchased | (2,999) | (23) | (2,976) | 0 | 0
Cumulative-effect adjustment of revenue recognition ASC 606 | 4,212 | 0 | 0 | 4,212 | 0
Equity compensation expense | 5,814 | 0 | 5,814 | 0 | 0
Balance, End of Period at Jun. 30, 2018 | $ 804,785 | $ 18,380 | $ 126,452 | $ 732,217 | $ (72,264)

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