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Consolidated Stockholders' Equity Statements - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2012 | $ 811,860 | $ 503 | $ 598,180 | $ 461,756 | $ (218,014) | $ (30,565) |
Beginning balance, Treasury shares at Dec. 31, 2012 |  |  |  |  | (6,167) |  |
Beginning balance, shares at Dec. 31, 2012 |  | 50,335 |  |  |  |  |
Net income | 103,313 |  |  | 103,313 |  |  |
Foreign currency translation | (20,720) |  |  |  |  | (20,720) |
Adjustments to pension and postretirement liability, net of $3.1 million, $3.6 million, and $14.0 million tax, respectively | 22,104 |  |  |  |  | 22,104 |
Other comprehensive income (loss), net of tax | 1,384 |  |  |  |  |  |
Exercise of stock options, net of tax withholding forfeitures | (184) |  | (31,003) |  | $ 30,819 |  |
Exercise of stock options, net of tax withholding forfeitures, shares |  |  |  |  | 879 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures | (2,815) |  | (7,012) |  | $ 4,197 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares |  |  |  |  | 120 |  |
Share repurchase program | (93,750) |  |  |  | $ (93,750) |  |
Share repurchase program, shares |  |  |  |  | (1,712) |  |
Share-based compensation | 25,588 |  | 25,588 |  |  |  |
Dividends ($0.20 per share) | (8,855) |  |  | (8,855) |  |  |
Ending balance at Dec. 31, 2013 | 836,541 | $ 503 | 585,753 | 556,214 | $ (276,748) | (29,181) |
Ending balance, Treasury shares at Dec. 31, 2013 |  |  |  |  | (6,880) |  |
Ending balance, shares at Dec. 31, 2013 |  | 50,335 |  |  |  |  |
Net income | 74,449 |  |  | 74,449 |  |  |
Foreign currency translation | (10,387) |  |  |  |  | (10,387) |
Adjustments to pension and postretirement liability, net of $3.1 million, $3.6 million, and $14.0 million tax, respectively | (6,463) |  |  |  |  | (6,463) |
Other comprehensive income (loss), net of tax | (16,850) |  |  |  |  |  |
Exercise of stock options, net of tax withholding forfeitures | (9,728) |  | (12,123) |  | $ 2,395 |  |
Exercise of stock options, net of tax withholding forfeitures, shares |  |  |  |  | 194 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures | (1,979) |  | (3,958) |  | $ 1,979 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares |  |  |  |  | 77 |  |
Share repurchase program | (92,197) |  |  |  | $ (92,197) |  |
Share repurchase program, shares |  |  |  |  | (1,262) |  |
Share-based compensation | 25,717 |  | 25,717 |  |  |  |
Dividends ($0.20 per share) | (8,767) |  |  | (8,767) |  |  |
Ending balance at Dec. 31, 2014 | $ 807,186 | $ 503 | 595,389 | 621,896 | $ (364,571) | (46,031) |
Ending balance, Treasury shares at Dec. 31, 2014 | (7,871) |  |  |  | (7,871) |  |
Ending balance, shares at Dec. 31, 2014 |  | 50,335 |  |  |  |  |
Contribution from noncontrolling interest | $ 1,470 |  |  |  |  |  | $ 1,470
Net income | 66,180 |  |  | 66,204 |  |  | (24)
Foreign currency translation | (20,842) |  |  |  |  | (20,820) | (22)
Adjustments to pension and postretirement liability, net of $3.1 million, $3.6 million, and $14.0 million tax, respectively | 7,864 |  |  |  |  | 7,864 |
Other comprehensive income (loss), net of tax | (12,978) |  |  |  |  |  |
Exercise of stock options, net of tax withholding forfeitures | (6,166) |  | (6,070) |  | $ (96) |  |
Exercise of stock options, net of tax withholding forfeitures, shares |  |  |  |  | 100 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures | (5,527) |  | (6,454) |  | $ 927 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares |  |  |  |  | 115 |  |
Share repurchase program | (39,053) |  |  |  | $ (39,053) |  |
Share repurchase program, shares |  |  |  |  | (698) |  |
Share-based compensation | 22,795 |  | 22,795 |  |  |  |
Dividends ($0.20 per share) | (8,384) |  |  | (8,384) |  |  |
Ending balance at Dec. 31, 2015 | $ 824,099 | $ 503 | $ 605,660 | $ 679,716 | $ (402,793) | $ (58,987) | $ 1,424
Ending balance, Treasury shares at Dec. 31, 2015 | (8,354) |  |  |  | (8,354) |  |
Ending balance, shares at Dec. 31, 2015 |  | 50,335 |  |  |  |  |

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