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Consolidated Statements of Equity (USD $) In Millions, except Share data, unless otherwise specified | Total USD ($) | Common Stock [Member] | Common Stock Including Additional Paid in Capital [Member] USD ($) | Accumulated Other Comprehensive Income (Loss) [Member] USD ($) | Retained Earnings [Member] USD ($) | Noncontrolling Interest [Member] USD ($)
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2008 |  |  | $ 659 | $ (5) | $ 700 | $ 0
Balance, shares at Dec. 31, 2008 |  | 62,575,257 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  | 12,477,500 |  |  |  |
Issuance of common stock, net of issuance costs, value | 170 |  | 170 | 0 | 0 | 0
Vesting of restricted stock units, shares |  | 128,175 |  |  |  |
Vesting of restricted stock units, value |  |  | 0 | 0 | 0 | 0
Issuance of shares pursuant to employee stock purchase plan, shares |  | 29,648 |  |  |  |
Issuance of shares pursuant to employee stock purchase plan, value |  |  | 0 | 0 | 0 | 0
Noncontrolling interests' capital contributions, value |  |  | 0 | 0 | 0 | 7
Dividends declared |  |  | 0 | 0 | 76 | 0
Net income (loss) | 89 |  | 0 | 0 | 95 | (6)
Net Income (Loss) Attributable to Parent | 95 |  |  |  |  |
Other comprehensive income (loss) |  |  | 0 | (1) | 0 | 0
Balance at Dec. 31, 2009 |  |  | 829 | (6) | 719 | 1
Balance, shares at Dec. 31, 2009 |  | 75,210,580 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock, net of issuance costs, value | 0 |  |  |  |  |
Vesting of restricted and performance stock units, shares |  | 77,281 |  |  |  |
Vesting of restricted and performance stock units, value |  |  | 0 | 0 | 0 | 0
Issuance of shares pursuant to employee stock purchase plan, shares |  | 28,558 |  |  |  |
Issuance of shares pursuant to employee stock purchase plan, value |  |  | 1 | 0 | 0 | 0
Noncontrolling interests' capital contributions, value |  |  | 0 | 0 | 0 | 10
Stock-based compensation |  |  | 1 | 0 | 0 | 0
Dividends declared |  |  | 0 | 0 | 78 | 0
Net income (loss) | 121 |  | 0 | 0 | 125 | (4)
Net Income (Loss) Attributable to Parent | 125 |  |  |  |  |
Other comprehensive income (loss) |  |  | 0 | 1 | 0 | 0
Balance at Dec. 31, 2010 | 1,599 |  | 831 | (5) | 766 | 7
Balance, shares at Dec. 31, 2010 |  | 75,316,419 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock, net of issuance costs, value | 0 |  |  |  |  |
Vesting of restricted and performance stock units, shares |  | 17,944 |  |  |  |
Vesting of restricted and performance stock units, value |  |  | 0 | 0 | 0 | 0
Issuance of shares pursuant to employee stock purchase plan, shares |  | 25,435 |  |  |  |
Issuance of shares pursuant to employee stock purchase plan, value |  |  | 1 | 0 | 0 | 0
Issuance of shares pursuant to dividend reinvestment and direct stock purchase plan, shares | 3,158 |  |  |  |  |
Noncontrolling interests' capital contributions, value |  |  | 0 | 0 | 0 | (4)
Stock-based compensation |  |  | 4 | 0 | 0 | 0
Dividends declared |  |  | 0 | 0 | 80 | 0
Net income (loss) | 147 |  | 0 | 0 |  | 0
Net Income (Loss) Attributable to Parent | 147 |  |  |  |  |
Other comprehensive income (loss) | (1) |  |  |  |  |
Balance at Dec. 31, 2011 | $ 1,666 |  | $ 836 | $ (6) | $ 833 | $ 3
Balance, shares at Dec. 31, 2011 |  | 75,362,956 |  |  |  |

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