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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock Issued | Additional Paid–In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock | Non–Controlling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2017 |  | 47,352 |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 1,630,100 | $ 473 | $ 569,319 | $ 1,312,660 | $ (89,230) | $ (172,342) | $ 9,220
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued (in shares) |  | 148 |  |  |  |  |
Stock issued | 576 | $ 2 | 574 |  |  |  |
Share repurchases for tax withholdings | (11,810) |  | (11,810) |  |  |  |
Stock-based compensation expense | 8,955 |  | 8,955 |  |  |  |
Foreign currency translation | 1,693 |  |  |  | 1,403 |  | 290
Net income | 52,671 |  |  | 51,970 |  |  | 701
Ending Balance (in shares) at Mar. 31, 2018 |  | 47,500 |  |  |  |  |
Ending balance at Mar. 31, 2018 | 1,682,823 | $ 475 | 567,038 | 1,365,268 | (87,827) | (172,342) | 10,211
Beginning Balance (in shares) at Dec. 31, 2017 |  | 47,352 |  |  |  |  |
Beginning balance at Dec. 31, 2017 | 1,630,100 | $ 473 | 569,319 | 1,312,660 | (89,230) | (172,342) | 9,220
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 91,237 |  |  |  |  |  |
Ending Balance (in shares) at Jun. 30, 2018 |  | 47,514 |  |  |  |  |
Ending balance at Jun. 30, 2018 | 1,715,995 | $ 475 | 574,818 | 1,403,693 | (100,518) | (172,342) | 9,869
Beginning Balance (in shares) at Mar. 31, 2018 |  | 47,500 |  |  |  |  |
Beginning balance at Mar. 31, 2018 | 1,682,823 | $ 475 | 567,038 | 1,365,268 | (87,827) | (172,342) | 10,211
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued (in shares) |  | 14 |  |  |  |  |
Stock issued | 875 |  | 875 |  |  |  |
Stock-based compensation expense | 6,905 |  | 6,905 |  |  |  |
Foreign currency translation | (13,175) |  |  |  | (12,691) |  | (484)
Net income | 38,566 |  |  |  |  |  | 142
Ending Balance (in shares) at Jun. 30, 2018 |  | 47,514 |  |  |  |  |
Ending balance at Jun. 30, 2018 | 1,715,995 | $ 475 | 574,818 | 1,403,693 | (100,518) | (172,342) | 9,869
Beginning Balance (in shares) at Dec. 31, 2018 |  | 47,557 |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 1,795,924 | $ 475 | 593,262 | 1,481,593 | (117,291) | (172,342) | 10,227
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued (in shares) |  | 117 |  |  |  |  |
Stock issued | 405 | $ 1 | 404 |  |  |  |
Share repurchases for tax withholdings | (9,723) |  | (9,723) |  |  |  |
Stock-based compensation expense | 9,703 |  | 9,703 |  |  |  |
Adjustments of redeemable non-controlling interest | 0 |  | 41,400 | (41,400) |  |  |
Foreign currency translation | 4,371 |  |  |  | 4,409 |  | (38)
Net income | 16,208 |  |  | 16,134 |  |  | 74
Ending Balance (in shares) at Mar. 31, 2019 |  | 47,674 |  |  |  |  |
Ending balance at Mar. 31, 2019 | 1,816,888 | $ 476 | 635,046 | 1,456,327 | (112,882) | (172,342) | 10,263
Beginning Balance (in shares) at Dec. 31, 2018 |  | 47,557 |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 1,795,924 | $ 475 | 593,262 | 1,481,593 | (117,291) | (172,342) | 10,227
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Adjustments of redeemable non-controlling interest | (41,400) |  |  |  |  |  |
Net income | 48,059 |  |  |  |  |  |
Ending Balance (in shares) at Jun. 30, 2019 |  | 47,701 |  |  |  |  |
Ending balance at Jun. 30, 2019 | 1,843,563 | $ 477 | 651,944 | 1,470,134 | (117,248) | (172,342) | 10,598
Beginning Balance (in shares) at Mar. 31, 2019 |  | 47,674 |  |  |  |  |
Beginning balance at Mar. 31, 2019 | 1,816,888 | $ 476 | 635,046 | 1,456,327 | (112,882) | (172,342) | 10,263
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Stock issued (in shares) |  | 27 |  |  |  |  |
Stock issued | 1,876 | $ 1 | 1,875 |  |  |  |
Share repurchases for tax withholdings | (135) |  | (135) |  |  |  |
Stock-based compensation expense | 15,158 |  | 15,158 |  |  |  |
Adjustments of redeemable non-controlling interest | (17,720) |  |  | (17,720) |  |  |
Foreign currency translation | (4,355) |  |  |  | (4,366) |  | 11
Net income | 31,851 |  |  | 31,527 |  |  | 324
Ending Balance (in shares) at Jun. 30, 2019 |  | 47,701 |  |  |  |  |
Ending balance at Jun. 30, 2019 | $ 1,843,563 | $ 477 | $ 651,944 | $ 1,470,134 | $ (117,248) | $ (172,342) | $ 10,598

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