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Consolidated Statements of Changes in Stockholders’ Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands | Total | Convertible Perpetual Preferred Stock | Common Stock | Additional Paid-In Capital | Treasury Stock | Accumulated Deficit | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 3,862,455 | $ 8 | $ 476 | $ 5,228,019 | $ (8,602) | $ (2,851,048) | $ 1,493,602
Beginning Balance (in shares) at Dec. 31, 2012 |  | 7,650 |  |  |  |  |
Beginning Balance (in shares) at Dec. 31, 2012 |  |  | 490,359 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Sale of royalty trust units | 28,985 |  |  | 7,289 |  |  | 21,696
Distributions to noncontrolling interest owners | (206,470) |  |  |  |  |  | (206,470)
Contributions from noncontrolling interest owners | 1,579 |  |  |  |  |  | 1,579
Purchase of treasury stock | (30,126) |  |  |  | (30,126) |  |
Retirement of treasury stock | 0 |  |  | (30,126) | 30,126 |  |
Stock purchases/distributions, net of distributions/purchases - retirement plans (in shares) |  |  | (99) |  |  |  |
Stock purchases/distributions, net of distributions/purchases - retirement plans | (435) |  |  | (267) | (168) |  |
Stock-based compensation | 88,397 |  |  | 88,397 |  |  |
Stock-based compensation excess tax provision | (4) |  |  | (4) |  |  |
Payment received on shareholder receivable | 1,250 |  |  | 1,250 |  |  |
Issuance of restricted stock awards, net of cancellations (in shares) |  |  | 30 |  |  |  |
Issuance of restricted stock awards, net of cancellations | 0 |  | $ 7 | (7) |  |  |
Common stock issued for debt | 0 |  |  |  |  |  |
Net (loss) income | (514,479) |  |  |  |  | (553,889) | 39,410
Convertible perpetual preferred stock dividends | (55,525) |  |  |  |  | (55,525) |
Ending Balance (in shares) at Dec. 31, 2013 |  | 7,650 |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2013 |  |  | 490,290 |  |  |  |
Ending Balance at Dec. 31, 2013 | 3,175,627 | $ 8 | $ 483 | 5,294,551 | (8,770) | (3,460,462) | 1,349,817
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Sale of royalty trust units | 22,119 |  |  | 4,091 |  |  | 18,028
Distributions to noncontrolling interest owners | (193,807) |  |  |  |  |  | (193,807)
Purchase of treasury stock | (6,373) |  |  |  | (6,373) |  |
Retirement of treasury stock | 0 |  |  | (6,373) | 6,373 |  |
Stock purchases/distributions, net of distributions/purchases - retirement plans (in shares) |  |  | 206 |  |  |  |
Stock purchases/distributions, net of distributions/purchases - retirement plans | 9 |  |  | (1,781) | 1,790 |  |
Stock-based compensation | 23,665 |  |  | 23,665 |  |  |
Stock-based compensation excess tax benefit | 14 |  |  | 14 |  |  |
Payment received on shareholder receivable | 1,250 |  |  | 1,250 |  |  |
Issuance of restricted stock awards, net of cancellations (in shares) |  |  | 3,311 |  |  |  |
Issuance of restricted stock awards, net of cancellations | 0 |  | $ 3 | (3) |  |  |
Common stock issued for debt | 0 |  |  |  |  |  |
Acquisition of ownership interest | (2,730) |  |  | (2,074) |  |  | (656)
Repurchase of common stock (in shares) |  |  | (27,411) |  |  |  |
Repurchase of common stock | (111,827) |  | $ (27) | (111,800) |  |  |
Conversion of preferred stock to common stock (in shares) |  | (2,000) | 18,423 |  |  |  |
Conversion of preferred stock to common stock | 0 | $ (2) | $ 18 | (16) |  |  |
Net (loss) income | 351,898 |  |  |  |  | 253,285 | 98,613
Convertible perpetual preferred stock dividends | $ (50,025) |  |  |  |  | (50,025) |
Ending Balance (in shares) at Dec. 31, 2014 |  | 5,650 |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2014 | 484,819 |  | 484,819 |  |  |  |
Ending Balance at Dec. 31, 2014 | $ 3,209,820 | $ 6 | $ 477 | 5,201,524 | (6,980) | (3,257,202) | 1,271,995
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Distributions to noncontrolling interest owners | (138,305) |  |  |  |  |  | (138,305)
Purchase of treasury stock | (2,428) |  |  |  | (2,428) |  |
Retirement of treasury stock | 0 |  |  | (2,428) | 2,428 |  |
Stock purchases/distributions, net of distributions/purchases - retirement plans (in shares) |  |  | (1,000) |  |  |  |
Stock purchases/distributions, net of distributions/purchases - retirement plans | 322 |  |  | (916) | 1,238 |  |
Stock-based compensation | 21,123 |  |  | 21,123 |  |  |
Payment received on shareholder receivable | 1,250 |  |  | 1,250 |  |  |
Issuance of restricted stock awards, net of cancellations (in shares) |  |  | 1,514 |  |  |  |
Issuance of restricted stock awards, net of cancellations | $ 0 |  | $ 5 | (5) |  |  |
Common stock issued for debt (in shares) | 92,800 |  | 120,881 |  |  |  |
Common stock issued for debt | $ 63,299 |  | $ 121 | 63,178 |  |  |
Conversion of preferred stock to common stock (in shares) |  | (230) | 2,968 |  |  |  |
Conversion of preferred stock to common stock | 0 |  | $ 3 | (3) |  |  |
Net (loss) income | (4,321,051) |  |  |  |  | (3,697,545) | (623,506)
Convertible perpetual preferred stock dividends (in shares) |  |  | 24,289 |  |  |  |
Convertible perpetual preferred stock dividends | $ (21,763) |  | $ 24 | 16,163 |  | (37,950) |
Ending Balance (in shares) at Dec. 31, 2015 |  | 5,420 |  |  |  |  |
Ending Balance (in shares) at Dec. 31, 2015 | 633,471 |  | 633,471 |  |  |  |
Ending Balance at Dec. 31, 2015 | $ (1,187,733) | $ 6 | $ 630 | $ 5,299,886 | $ (5,742) | $ (6,992,697) | $ 510,184

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