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CONSOLIDATED CONDENSED STATEMENT OF SHAREHOLDERS' EQUITY - 6 months ended Jun. 30, 2016 - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2015 |  | (93,769) |  |  |  | (2)
Beginning Balance at Dec. 31, 2015 | $ 412,945 | $ 938 | $ 322,793 | $ 101,047 | $ (11,813) | $ (20)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Acquisition of treasury stock (in shares) |  |  |  |  |  | (571)
Acquisition of treasury stock | (5,133) |  |  |  |  | $ (5,133)
Exercise of stock options (in shares) |  | 0 |  |  |  | 299
Exercise of stock options | 2,096 | $ 0 | (541) |  |  | $ 2,637
Compensatory awards released from restriction (in shares) |  | 440 |  |  |  | 91
Compensatory awards released from restriction |  | $ 4 | (821) |  |  | $ 817
Share-based compensation | 4,329 |  | 4,329 |  |  |
Stock dividends (in shares) |  | 5 |  |  |  | 0
Stock dividends |  |  | 45 | (53) |  | $ 8
Cash dividends | (1,882) |  |  | (1,882) |  |
Equity adjustment from foreign currency translation | 3,618 |  |  |  | 3,618 |
Change in fair value of derivative instruments | (2,223) |  |  |  |  |
Change in fair value of derivative instruments | (2,161) |  |  |  | (2,161) |
Net income | 72,495 |  |  | 72,495 |  |
Ending Balance (in shares) at Jun. 30, 2016 |  | (94,214) |  |  |  | (183)
Ending Balance at Jun. 30, 2016 | $ 486,307 | $ 942 | $ 325,805 | $ 171,607 | $ (10,356) | $ (1,691)

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