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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2016 |  | 222,401 |  |  |  |
Balance at beginning of period at Dec. 31, 2016 | $ 1,311,319 | $ 2,802 | $ 1,036,786 | $ 317,270 | $ (32,977) | $ (12,562)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (50,317) |  |  | (50,317) |  |
Foreign currency translation adjustments | 2,809 |  |  |  | 2,809 |
Change in marketable securities | (342) |  |  |  | (342) |
Equity-based compensation expense | 11,458 |  | 11,458 |  |  |
Common stock dividends | (50,424) |  |  | (50,424) |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 694 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 7 | (7) |  |  |
Common shares issued for employee stock purchase plan (ESPP) (in shares) |  | 50 |  |  |  |
Common shares issued for employee stock purchase plan (“ESPP”) | 512 | $ 1 | 511 |  |  |
Treasury shares issued upon vesting of share-based awards (in shares) |  | 4 |  |  |  |
Treasury shares issued upon vesting of share-based awards | (18) |  | (84) |  |  | 66
Treasury shares issued for ESPP (in shares) |  | 106 |  |  |  |
Treasury shares issued for ESPP | 740 | $ 0 | (166) | (736) |  | 1,642
Treasury shares withheld (in shares) |  | (193) |  |  |  |
Treasury shares withheld | (2,254) |  |  |  |  | (2,254)
Balance at end of period (in shares) at Sep. 30, 2017 |  | 223,062 |  |  |  |
Balance at end of period at Sep. 30, 2017 | 1,223,483 | $ 2,810 | 1,048,498 | 215,793 | (30,510) | (13,108)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Cumulative effect of accounting change | 670 |  |  | 670 |  |
Balance at beginning of period (in shares) at Dec. 31, 2017 |  | 223,289 |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 1,115,901 | $ 2,814 | 1,050,873 | 106,923 | (30,972) | (13,737)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net loss | (74,835) |  |  | (74,835) |  |
Foreign currency translation adjustments | (653) |  |  |  | (653) |
Change in marketable securities | 110 |  |  |  | 110 |
Equity-based compensation expense | 8,176 |  | 8,176 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 938 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 11 | (11) |  |  |
Common shares issued for employee stock purchase plan (ESPP) (in shares) |  | 232 |  |  |  |
Common shares issued for employee stock purchase plan (“ESPP”) | 1,315 | $ 3 | 1,312 |  |  | 0
Treasury shares withheld (in shares) |  | (231) |  |  |  |
Treasury shares withheld | (1,501) |  |  |  |  | (1,501)
Balance at end of period (in shares) at Sep. 30, 2018 |  | 224,228 |  |  |  |
Balance at end of period at Sep. 30, 2018 | $ 1,049,183 | $ 2,828 | $ 1,060,350 | $ 32,758 | $ (31,515) | $ (15,238)

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