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Capital Structure
 12 Months Ended
Dec. 31, 2012
Capital Structure [Abstract]  
Capital Structure
Capital Structure
Common Stock
Pursuant to our Plan of Reorganization, all shares of our common stock outstanding prior to the Effective Date were canceled and the issuance of 485 million new shares of reorganized Calpine Corporation common stock was authorized to resolve allowed unsecured claims. A portion of the 485 million authorized shares was immediately distributed, and the remainder was reserved for distribution to holders of certain disputed claims that, although allowed as of the Effective Date, were unresolved. In June 2011, we settled the largest remaining claim outstanding and began the process of distributing the balance of the reserved shares, which was completed during the third quarter of 2011, pursuant to our Plan of Reorganization.
Our authorized common stock consists of 1.4 billion shares of Calpine Corporation common stock. Common stock issued as of December 31, 2012 and 2011, was 492,495,100 shares and 490,468,815 shares, respectively, at a par value of $0.001 per share. Common stock outstanding as of December 31, 2012 and 2011, was 457,048,970 shares and 481,743,738 shares, respectively. The table below summarizes our common stock activity for the years ended December 31, 2012, 2011 and 2010.
 
Shares
Issued
 
Shares
Held in
Treasury
 
Shares
Held in
Reserve
 
Total
Balance, December 31, 2009
443,325,827

 
(327,572
)
 
44,747,044

 
487,745,299

Resolution of claims
488,612

 
—

 
(488,612
)
 
—

Shares issued under Calpine Equity Incentive Plans
1,068,917

 
(120,586
)
 
—

 
948,331

Balance, December 31, 2010
444,883,356

 
(448,158
)
 
44,258,432

 
488,693,630

Resolution of claims
44,258,432

 
—

 
(44,258,432
)
 
—

Shares issued under Calpine Equity Incentive Plans
1,327,027

 
(139,846
)
 
—

 
1,187,181

Share repurchase program
—

 
(8,137,073
)
 
—

 
(8,137,073
)
Balance, December 31, 2011
490,468,815

 
(8,725,077
)
 
—

 
481,743,738

Shares issued under Calpine Equity Incentive Plans
2,026,285

 
(284,376
)
 
—

 
1,741,909

Share repurchase program
—

 
(26,436,677
)
 
—

 
(26,436,677
)
Balance, December 31, 2012
492,495,100

 
(35,446,130
)
 
—

 
457,048,970


Treasury Stock
As of December 31, 2012 and 2011, we had treasury stock of 35,446,130 shares and 8,725,077 shares, respectively, with a cost of $594 million and $125 million, respectively. On August 23, 2011, we announced that our Board of Directors had authorized the repurchase of up to $300 million in shares of our common stock. In April 2012, our Board of Directors authorized us to double the size of our share repurchase program, increasing our permitted cumulative repurchases to $600 million in shares of our common stock. As of the filing of this Report, we have completed our previously announced $600 million share repurchase program, having repurchased a total of 35,568,833 shares of our outstanding common stock at an average price paid of $16.87 per share. In February 2013, our Board of Directors authorized the repurchase of an additional $400 million in shares of our common stock, bringing the cumulative authorization total to $1.0 billion. Our treasury stock also consists of our common stock withheld to satisfy federal, state and local income tax withholding requirements for vested employee restricted stock awards. All treasury stock is held at cost.