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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, 2014 | $ 2,882,241 | $ 1,870 | $ 4,034,655 | $ (46,800) | $ (1,108,001) | $ 2,881,724 | $ 517
Balances at beginning of period (in shares) at Dec. 31, 2014 |  | 187,038,000 |  |  |  |  |
Compensation expense related to restricted stock grants | 31,651 |  | 31,651 |  |  | 31,651 |
Net income (loss) | (458,155) |  |  |  | (457,477) | (457,477) | (678)
Issuance of common stock under Associate Stock Purchase Plan | 2,870 | $ 1 | 2,869 |  |  | 2,870 |
Issuance of common stock under Associate Stock Purchase Plan (in shares) |  | 122,000 |  |  |  |  |
Restricted stock, net |  | $ 12 | (12) |  |  |  |
Restricted stock, net (in shares) |  | 1,179,000 |  |  |  |  |
Other | 120 |  | 120 |  |  | 120 |
Balances at end of period (in shares) at Dec. 31, 2015 |  | 188,339,000 |  |  |  |  |
Balances at end of period at Dec. 31, 2015 | 2,458,727 | $ 1,883 | 4,069,283 | (46,800) | (1,565,478) | 2,458,888 | (161)
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 | $ 287 |  | 137 |  |  | 137 | 150
Balances at end of period (in shares) at Dec. 31, 2016 | 190,045,681 | 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 | $ 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)

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