Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Activity [Table Text Block]

A summary of our performance share unit activity for the three months ended March 31, 2015, is as follows:

	Number of Performance Share Units	Weighted Average Grant-Date Fair Value
Nonvested — December 31, 2014	867,479	$	21.93
Granted	340,730	$	23.91
Forfeited	37,235	$	21.99
Vested(1)	8,254	$	22.56
Nonvested — March 31, 2015	1,162,720	$	22.50

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(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.

Schedule of Restricted Stock and Restricted Stock Unit Activity

A summary of our restricted stock and restricted stock unit activity for the Calpine Equity Incentive Plans for the three months ended March 31, 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	1,510,546	$	21.46
Forfeited	70,901	$	18.80
Vested	1,515,774	$	16.36
Nonvested — March 31, 2015	4,125,739	$	19.86