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Consolidated Stockholders' Equity Statements - USD ($) shares in Thousands, $ in Thousands | Total | Preferred Stock [Member] | 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, shares at Dec. 31, 2014 |  | 0 | 50,335 |  |  |  |  |
Beginning balance at Dec. 31, 2014 | $ 807,186 | $ 0 | $ 503 | $ 595,389 | $ 621,896 | $ (364,571) | $ (46,031) | $ 0
Beginning balance, Treasury shares at Dec. 31, 2014 |  |  |  |  |  | (7,871) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Contribution from noncontrolling interest | 1,470 |  |  |  |  |  |  | 1,470
Net income | 66,180 |  |  |  | 66,204 |  |  | (24)
Foreign currency translation gain (loss), net of $1.2 million, $1.3 million, and $1.8 million tax, respectively | (20,842) |  |  |  |  |  | (20,820) | (22)
Adjustments to pension and postretirement liability, net of $4.1 million, $3.1 million, and $3.6 million tax, respectively | 7,864 |  |  |  |  |  | 7,864 |
Other comprehensive 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, shares |  |  |  |  |  | (698) |  |
Share repurchase program | (39,053) |  |  |  |  | $ (39,053) |  |
Share-based compensation related items | 22,795 |  |  | 22,795 |  |  |  |
Common stock dividends ($0.20 per share) | (8,384) |  |  |  | (8,384) |  |  |
Ending balance, shares at Dec. 31, 2015 |  | 0 | 50,335 |  |  |  |  |
Ending balance at Dec. 31, 2015 | 825,523 | $ 0 | $ 503 | 605,660 | 679,716 | $ (402,793) | (58,987) | 1,424
Ending balance, Treasury shares at Dec. 31, 2015 |  |  |  |  |  | (8,354) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 127,646 |  |  |  | 128,003 |  |  | (357)
Foreign currency translation gain (loss), net of $1.2 million, $1.3 million, and $1.8 million tax, respectively | 18,687 |  |  |  |  |  | 18,750 | (63)
Adjustments to pension and postretirement liability, net of $4.1 million, $3.1 million, and $3.6 million tax, respectively | 1,170 |  |  |  |  |  | 1,170 |
Other comprehensive loss, net of tax | 19,857 |  |  |  |  |  |  |
Preferred stock issuance, net, shares |  | 52 |  |  |  |  |  |
Preferred stock issuance, net | 501,498 | $ 1 |  | 501,497 |  |  |  |
Exercise of stock options, net of tax withholding forfeitures | (4,088) |  |  | (4,205) |  | $ 117 |  |
Exercise of stock options, net of tax withholding forfeitures, shares |  |  |  |  |  | 76 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures | (3,390) |  |  | (5,040) |  | $ 1,650 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares |  |  |  |  |  | 123 |  |
Share-based compensation related items | 18,178 |  |  | 18,178 |  |  |  |
Preferred stock dividends | (15,428) |  |  |  | (15,428) |  |  |
Common stock dividends ($0.20 per share) | (8,479) |  |  |  | (8,479) |  |  |
Ending balance, shares at Dec. 31, 2016 |  | 52 | 50,335 |  |  |  |  |
Ending balance at Dec. 31, 2016 | $ 1,461,317 | $ 1 | $ 503 | 1,116,090 | 783,812 | $ (401,026) | (39,067) | 1,004
Ending balance, Treasury shares at Dec. 31, 2016 | (8,155) |  |  |  |  | (8,155) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | $ 92,853 |  |  |  | 93,210 |  |  | (357)
Foreign currency translation gain (loss), net of $1.2 million, $1.3 million, and $1.8 million tax, respectively | (65,046) |  |  |  |  |  | (65,030) | (16)
Adjustments to pension and postretirement liability, net of $4.1 million, $3.1 million, and $3.6 million tax, respectively | 6,071 |  |  |  |  |  | 6,071 |
Other comprehensive loss, net of tax | (58,975) |  |  |  |  |  |  |
Exercise of stock options, net of tax withholding forfeitures | (2,838) |  |  | (2,635) |  | $ (203) |  |
Exercise of stock options, net of tax withholding forfeitures, shares |  |  |  |  |  | 55 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures | (3,726) |  |  | (4,270) |  | $ 544 |  |
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares |  |  |  |  |  | 97 |  |
Share repurchase program, shares |  |  |  |  |  | (313) |  |
Share repurchase program | (25,000) |  |  |  |  | $ (25,000) |  |
Share-based compensation related items | 14,647 |  |  | 14,647 |  |  |  |
Preferred stock dividends | (34,931) |  |  |  | (34,931) |  |  |
Common stock dividends ($0.20 per share) | (8,481) |  |  |  | (8,481) |  |  |
Ending balance, shares at Dec. 31, 2017 |  | 52 | 50,335 |  |  |  |  |
Ending balance at Dec. 31, 2017 | $ 1,434,866 | $ 1 | $ 503 | $ 1,123,832 | $ 833,610 | $ (425,685) | $ (98,026) | $ 631
Ending balance, Treasury shares at Dec. 31, 2017 | (8,316) |  |  |  |  | (8,316) |  |

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