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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In- Capital | Treasury Stock | Accumulated Deficit | Stockholders' Equity | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balances at beginning of period at Dec. 31, 2015 | $ 2,458,727 | $ 1,883 | $ 4,069,283 | $ (46,800) | $ (1,565,478) | $ 2,458,888 | $ (161)
Balances at beginning of period (in shares) at Dec. 31, 2015 |  | 188,339,000 |  |  |  |  |
Compensation expense related to restricted stock grants | 32,285 |  | 32,285 |  |  | 32,285 |
Net income (loss) | (404,636) |  |  |  | (404,397) | (404,397) | (239)
Issuance of common stock under Associate Stock Purchase Plan | 2,349 | $ 2 | 2,347 |  |  | 2,349 |
Issuance of common stock under Associate Stock Purchase Plan (in shares) |  | 172,000 |  |  |  |  |
Restricted stock, net |  | $ 24 | (24) |  |  |  |
Restricted stock, net (in shares) |  | 2,396,000 |  |  |  |  |
Purchase of treasury stock | $ (9,640) | $ (8) | 8 | (9,640) |  | (9,640) |
Purchase of treasury stock (in shares) | (750,000) | (750,000) |  |  |  |  |
Shares withheld for employee taxes | $ (1,640) | $ (1) | (1,639) |  |  | (1,640) |
Shares withheld for employee taxes (in shares) |  | (111,000) |  |  |  |  |
Other, net | 287 |  | 137 |  |  | 137 | 150
Balances at end of period (in shares) at Dec. 31, 2016 |  | 190,046,000 |  |  |  |  |
Balances at end of period at Dec. 31, 2016 | 2,077,732 | $ 1,900 | 4,102,397 | (56,440) | (1,969,875) | 2,077,982 | (250)
Compensation expense related to restricted stock grants | 27,832 |  | 27,832 |  |  | 27,832 |
Net income (loss) | (571,606) |  |  |  | (571,419) | (571,419) | (187)
Issuance of common stock under Associate Stock Purchase Plan | $ 2,041 | $ 2 | 2,039 |  |  | 2,041 |
Issuance of common stock under Associate Stock Purchase Plan (in shares) |  | 181,000 |  |  |  |  |
Restricted stock, net |  | $ 14 | (14) |  |  |  |
Restricted stock, net (in shares) |  | 1,421,000 |  |  |  |  |
Purchase of treasury stock (in shares) | 0 |  |  |  |  |  |
Shares withheld for employee taxes | $ (5,889) | $ (3) | (5,886) |  |  | (5,889) |
Shares withheld for employee taxes (in shares) |  | (372,000) |  |  |  |  |
Other, net | $ 181 |  | 181 |  |  | 181 |
Balances at end of period (in shares) at Dec. 31, 2017 | 191,275,928 | 191,276,000 |  |  |  |  |
Balances at end of period at Dec. 31, 2017 | $ 1,530,291 | $ 1,913 | 4,126,549 | (56,440) | (2,541,294) | 1,530,728 | (437)
Compensation expense related to restricted stock grants | 26,067 |  | 26,067 |  |  | 26,067 |
Net income (loss) | (528,352) |  |  |  | (528,258) | (528,258) | (94)
Issuance of common stock under Associate Stock Purchase Plan | 1,469 | $ 1 | 1,468 |  |  | 1,469 |
Issuance of common stock under Associate Stock Purchase Plan (in shares) |  | 207,000 |  |  |  |  |
Restricted stock, net |  | $ 26 | (26) |  |  |  |
Restricted stock, net (in shares) |  | 2,593,000 |  |  |  |  |
Purchase of treasury stock | $ (8,500) |  |  | (8,500) |  | (8,500) |
Purchase of treasury stock (in shares) | (1,280,802) | (1,281,000) |  |  |  |  |
Shares withheld for employee taxes | $ (3,061) | $ (4) | (3,057) |  |  | (3,061) |
Shares withheld for employee taxes (in shares) |  | (439,000) |  |  |  |  |
Other, net | $ 499 | $ 32 | 146 |  | 280 | 458 | 41
Balances at end of period (in shares) at Dec. 31, 2018 | 192,356,051 | 192,356,000 |  |  |  |  |
Balances at end of period at Dec. 31, 2018 | $ 1,018,413 | $ 1,968 | $ 4,151,147 | $ (64,940) | $ (3,069,272) | $ 1,018,903 | $ (490)

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