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Capital Structure
 12 Months Ended
Dec. 31, 2013
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, 2013 and 2012, was 497,841,056 shares and 492,495,100 shares, respectively, at a par value of $0.001 per share. Common stock outstanding as of December 31, 2013 and 2012, was 429,038,988 shares and 457,048,970 shares, respectively. The table below summarizes our common stock activity for the years ended December 31, 2013, 2012 and 2011.
 
Shares
Issued
 
Shares
Held in
Treasury
 
Shares
Held in
Reserve
 
Total
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

Shares issued under Calpine Equity Incentive Plans
5,345,956

 
(2,323,828
)
 
—

 
3,022,128

Share repurchase program
—

 
(31,032,110
)
 
—

 
(31,032,110
)
Balance, December 31, 2013
497,841,056

 
(68,802,068
)
 
—

 
429,038,988


Treasury Stock
As of December 31, 2013 and 2012, we had treasury stock of 68,802,068 shares and 35,446,130 shares, respectively, with a cost of $1.2 billion and $594 million, respectively. Having previously authorized $600 million in repurchases of our common stock, our Board of Directors authorized the repurchase of an additional $400 million in shares of our common stock in February 2013 and an additional $100 million in August 2013. Under the aggregate $1.1 billion of authorizations, we repurchased a total of 60,139,816 shares of our outstanding common stock at an average price of $18.29 per share. In November 2013, our Board of Directors authorized a new $1.0 billion multi-year share repurchase program, under which we have repurchased a total of 12,459,919 shares of our common stock for approximately $239 million at an average price of $19.15 per share as of the filing of this Report. 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 and net share employee stock options exercises under the Equity Plan. All treasury stock is held at cost.