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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $) In Thousands | Total | Convertible Perpetual Preferred Stock | Common Stock | Additional Paid-In Capital | Treasury Stock | Accumulated Deficit | Noncontrolling 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 | 490,359 |  | 490,359 |  |  |  |
Beginning Balance (in shares) at Dec. 31, 2012 | 7,650 | 7,650 |  |  |  |  |
Sale of royalty trust units | 28,985 |  |  | 7,289 |  |  | 21,696
Distributions to noncontrolling interest owners | (153,002) |  |  |  |  |  | (153,002)
Purchase of treasury stock | (29,661) |  |  |  | (29,661) |  |
Retirement of treasury stock | 0 |  |  | (29,661) | 29,661 |  |
Stock purchase - retirement plans, net of distributions (in shares) |  |  | (50) |  |  |  |
Stock purchase — retirement plans, net of distributions | 249 |  |  | 410 | (161) |  |
Stock-based compensation | 81,746 |  |  | 81,746 |  |  |
Stock-based compensation excess tax benefit | (4) |  |  | (4) |  |  |
Issuance of restricted stock awards, net of cancellations (in shares) |  |  | 227 |  |  |  |
Issuance of restricted stock awards, net of cancellations | 0 |  | 7 | (7) |  |  |
Net (loss) income | (563,576) |  |  |  |  | (572,969) | 9,393
Convertible perpetual preferred stock dividends | (41,644) |  |  |  |  | (41,644) |
Ending Balance at Sep. 30, 2013 | $ 3,185,548 | $ 8 | $ 483 | $ 5,287,792 | $ (8,763) | $ (3,465,661) | $ 1,371,689
Ending Balance (in shares) at Sep. 30, 2013 | 490,536 |  | 490,536 |  |  |  |
Ending Balance (in shares) at Sep. 30, 2013 | 7,650 | 7,650 |  |  |  |  |

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