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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 | (52,613) |  |  | (52,613) |  |
Foreign currency translation adjustments | 1,321 |  |  |  | 1,321 |
Change in marketable securities | (241) |  |  |  | (241) |
Equity-based compensation expense | 9,116 |  | 9,116 |  |  |
Common stock dividends | (33,426) |  |  | (33,426) |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 685 |  |  |  |
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) | 526 | $ 1 | 525 |  |  |
Treasury shares issued upon vesting of share-based awards (in shares) |  | 1 |  |  |  |
Treasury shares issued upon vesting of share-based awards | (8) |  | (31) |  |  | 23
Treasury shares issued for ESPP (in shares) |  | 105 |  |  |  |
Treasury shares issued for ESPP | 740 | $ 1 | (903) |  |  | 1,642
Treasury shares withheld (in shares) |  | (190) |  |  |  |
Treasury shares withheld | (2,241) |  |  |  |  | (2,241)
Balance at end of period (in shares) at Jun. 30, 2017 |  | 223,052 |  |  |  |
Balance at end of period at Jun. 30, 2017 | 1,234,493 | $ 2,811 | 1,045,486 | 231,231 | (31,897) | (13,138)
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 | (67,836) |  |  | (67,836) |  |
Foreign currency translation adjustments | (748) |  |  |  | (748) |
Change in marketable securities | 82 |  |  |  | 82 |
Equity-based compensation expense | 5,168 |  | 5,168 |  |  |
Common shares issued upon vesting of share-based awards (in shares) |  | 848 |  |  |  |
Common shares issued upon vesting of share-based awards | 0 | $ 10 | (10) |  |  |
Common shares issued for employee stock purchase plan (ESPP) (in shares) |  | 99 |  |  |  |
Common shares issued for employee stock purchase plan (ESPP) | 562 | $ 1 | 561 |  |  | 0
Treasury shares withheld (in shares) |  | (198) |  |  |  |
Treasury shares withheld | (1,217) |  |  |  |  | (1,217)
Balance at end of period (in shares) at Jun. 30, 2018 |  | 224,038 |  |  |  |
Balance at end of period at Jun. 30, 2018 | $ 1,052,582 | $ 2,825 | $ 1,056,592 | $ 39,757 | $ (31,638) | $ (14,954)

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