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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Retained Earnings | Non-controlling interest in subsidiaries
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2014 |  | 38,897 |  |  |  |  |
Beginning balance at Dec. 31, 2014 | $ 1,077,721 | $ 430 | $ 179,077 | $ (50,581) | $ (150,331) | $ 1,081,730 | $ 17,396
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued upon exercise of stock options (in shares) |  | 2 |  |  |  |  |
Stock issued upon exercise of stock options | 24 | $ 0 | 24 |  |  |  |
Tax expense from stock option and restricted stock units | (230) |  | (230) |  |  |  |
Stock issued upon vesting of restricted and deferred stock units (in shares) |  | 56 |  |  |  |  |
Stock issued upon vesting of restricted and deferred stock units | 0 | $ 1 | (1) |  |  |  |
Stock-based compensation, net of share repurchases for tax withholdings | 7,845 |  | 7,845 |  |  |  |
Purchase of shares of treasury stock (in shares) |  | (210) |  |  |  |  |
Purchase of shares of treasury stock | (22,011) |  |  |  | (22,011) |  |
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 | 50 |  |  | 50 |  |  |
Foreign currency translation | (51,055) |  |  | (49,382) |  |  | (1,673)
Adjustment of redeemable non-controlling interest | (32,448) |  | (13,927) | (9,108) |  | (9,413) |
Net income (loss) | 87,025 |  |  |  |  | 90,416 | (3,391)
Ending Balance (in shares) at Sep. 30, 2015 |  | 38,745 |  |  |  |  |
Ending balance at Sep. 30, 2015 | 1,066,921 | $ 431 | 172,788 | (109,021) | (172,342) | 1,162,733 | 12,332
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 | 99 |  |  |  |  |  |
Ending Balance (in shares) at Sep. 30, 2015 |  | 38,745 |  |  |  |  |
Ending balance at Sep. 30, 2015 | 1,066,921 | $ 431 | 172,788 | (109,021) | (172,342) | 1,162,733 | 12,332
Beginning Balance (in shares) at Dec. 31, 2015 |  | 38,746 |  |  |  |  |
Beginning balance at Dec. 31, 2015 | 1,095,681 | $ 431 | 174,972 | (103,451) | (172,342) | 1,183,634 | 12,437
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued upon exercise of stock options (in shares) |  | 21 |  |  |  |  |
Stock issued upon exercise of stock options | 283 | $ 0 | 283 |  |  |  |
Tax expense from stock option and restricted stock units | (300) |  | (300) |  |  |  |
Stock issued upon vesting of restricted and deferred stock units (in shares) |  | 61 |  |  |  |  |
Stock issued upon vesting of restricted and deferred stock units | 1 | $ 1 | 0 |  |  |  |
Stock-based compensation, net of share repurchases for tax withholdings | 12,142 |  | 12,142 |  |  |  |
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 | 209 |  |  | 209 |  |  |
Stock issued for purchase of EFS (in shares) |  | 4,012 |  |  |  |  |
Stock issued for purchase of EFS | 354,953 | $ 40 | 354,913 |  |  |  |
Foreign currency translation | 899 |  |  | 709 |  |  | 190
Net income (loss) | 54,337 |  |  |  |  | 55,350 | (1,013)
Ending Balance (in shares) at Sep. 30, 2016 |  | 42,840 |  |  |  |  |
Ending balance at Sep. 30, 2016 | 1,518,205 | $ 472 | 542,010 | (102,533) | (172,342) | 1,238,984 | 11,614
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Changes in available-for-sale securities, net of tax effect of $123 and $29 for the nine months ended September 30, 2016 and 2015 | (62) |  |  |  |  |  |
Ending Balance (in shares) at Sep. 30, 2016 |  | 42,840 |  |  |  |  |
Ending balance at Sep. 30, 2016 | $ 1,518,205 | $ 472 | $ 542,010 | $ (102,533) | $ (172,342) | $ 1,238,984 | $ 11,614

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