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Equity-Based Compensation (CPE Inc. only) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 31, 2011
2009 Long Term Incentive Plan
Dec. 31, 2012
2009 Long Term Incentive Plan
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2010
Restricted Stock
Dec. 31, 2012
Performance Based Share Units
Dec. 31, 2011
Performance Based Share Units
Dec. 31, 2012
Non-Qualified Stock Options
Dec. 31, 2011
Non-Qualified Stock Options
Dec. 31, 2010
Non-Qualified Stock Options
Share-based compensation plans                          
Pool of shares of common stock for issuance in connection with share-based awards before additional approval       3,400,000                  
Pool of shares of common stock for issuance in connection with share-based awards       5,500,000                  
Number of shares available for grant         2,700,000                
Share-based compensation expense $ 11,796,000 $ 8,796,000 $ 7,234,000                    
Award vesting period           3 years         3 years    
Period within which share-based awards vest if employee is terminated without cause after change in control           2 years         2 years    
Maximum expiration period                     10 years    
Restricted stock and performance based share unit award activity                          
Non-vested shares at the beginning of the period, number (in shares)           936,000     159,000        
Granted, number (in shares)           161,000     220,000        
Forfeited, number (in shares)           (17,000)     (2,000)        
Vested, number (in shares)           (776,000)              
Non-vested shares at the end of the period, number (in shares)           304,000 936,000   376,000 159,000      
Weighted Average Grant-Date Fair Value (per share)                          
Non-vested shares at the beginning of the period (in dollars per share)           $ 15.75     $ 20.12        
Granted (in dollars per share)           $ 17.61 $ 21.28   $ 17.61 $ 20.12      
Forfeited (in dollars per share)           $ 15.56 $ 15.36   $ 18.58 $ 20.12      
Vested (in dollars per share)           $ 15.08 $ 18.31            
Non-vested shares at the end of the period (in dollars per share)           $ 18.46 $ 15.75   $ 18.66 $ 20.12      
Performance period                 3 years        
Percentage of target amount, low end of range                 0.00%        
Percentage of target amount, high end of range                 200.00%        
Unrecognized compensation cost           2,300,000     3,900,000   2,000,000    
Weighted-average period over which unrecognized compensation cost recognized prior to vesting           1 year 10 months 24 days     1 year 10 months 24 days   1 year 9 months 18 days    
Total fair value of awards vested           15,100,000 167,000 6,000          
Market value of shares purchased as a result of net settlement of the award vesting event           5,400,000              
Number of shares purchased as a result of net settlement of the award vesting event           276,000              
Non-qualified stock option activity                          
Options outstanding at the beginning of the period (in shares)                     1,138,000    
Granted (in shares)                     207,000    
Exercised (in shares)                     (4,000)    
Forfeited (in shares)                     (9,000)    
Options outstanding at the end of the period (in shares)                     1,332,000 1,138,000  
Exercisable at the end of the period (in shares)                     941,000    
Vested and expected to vest at the end of the period (in shares)                     1,319,000    
Weighted Average Exercise Price (per option)                          
Options outstanding at the beginning of the period (in dollars per share)                     $ 15.77    
Options outstanding at the end of the period (in dollars per share)                     $ 15.95 $ 15.77  
Exercisable at the end of the period (in dollars per share)                     $ 15.00    
Vested and expected to vest at the end of the period (in dollars per share)                     $ 15.94    
Other disclosures                          
Options outstanding weighted Average Contractual Term                     7 years 4 months 17 days 8 years 22 days  
Exercisable weighted Average Contractual Term                     6 years 10 months 20 days    
Vested and expected to vest weighted Average Contractual Term                     7 years 4 months 13 days    
Exercised aggregate Intrinsic Value                     19,000    
Options outstanding aggregate Intrinsic Value                     4,720,000    
Exercisable aggregate Intrinsic Value                     4,075,000    
Aggregate Intrinsic Value                     $ 4,692,000    
Assumptions:                          
Weighted-average grant date fair value (per option)                     $ 9.05 $ 12.47 $ 9.34
Risk-free interest rate (as a percent)                     1.70% 2.90% 3.00%
Expected option life                     6 years 6 months 6 years 6 months 6 years 6 months
Expected volatility (as a percent)                     53.60% 59.50% 57.00%
Assumptions used to estimate the fair value of options granted                          
Peer historical lookback period used for developing expected volatility                     6 years 6 months