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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of our restricted stock and restricted stock unit activity for the Calpine Equity Incentive Plans for the nine months ended September 30, 2015, is as follows:
 
Number of
Restricted
Stock Awards
 
Weighted
Average
Grant-Date
Fair Value
Nonvested — December 31, 2014
4,201,868

 
$
18.01

Granted
1,577,932

 
$
21.40

Forfeited
240,259

 
$
19.64

Vested
1,589,073

 
$
16.54

Nonvested — September 30, 2015
3,950,468

 
$
19.85
Schedule of Share-based Compensation, Activity
A summary of our performance share unit activity for the nine months ended September 30, 2015, is as follows:
 
Number of
Performance Share Units
 
Weighted
Average
Grant-Date
Fair Value
Nonvested — December 31, 2014
867,479

 
$
21.93

Granted
365,667

 
$
23.91

Forfeited
89,117

 
$
22.33

Vested(1)
8,254

 
$
22.56

Nonvested — September 30, 2015
1,135,775

 
$
22.53


___________
(1)
In accordance with the applicable performance share unit agreements, performance share units granted to employees who meet the retirement eligibility requirements stipulated in the Equity Plan are fully vested upon the later of the date on which the employee becomes eligible to retire or one-year anniversary of the grant date.