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Stock-Based Compensation Stock-Based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0  
Restricted stock units and awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 88,856 2,710,851  
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price $ 9.45 $ 9.45  
Parent [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number [1] 9,316,676 [2] 9,316,676 [2] 9,820,168
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [1],[3] $ 10.35 $ 10.35 $ 11.69
Parent [Member] | Restricted stock units and awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number [4] 5,331,636 [2] 5,331,636 [2] 8,447,922
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [3],[4] $ 7.61 $ 7.61 $ 7.95
[1] On March 14, 2017, we modified vested and unvested stock options held by active employees with exercise prices above the then-current market price of CEC’s common stock to have an exercise price of $9.45.
[2] There were no grants of stock options or restricted stock units related to CEC common stock during the nine months ended September 30, 2017.
[3] Represents weighted average exercise price for stock options and weighted average fair value for restricted stock units.
[4] During the three and nine months ended September 30, 2017, 88,856 and 2,710,851 restricted stock units vested, respectively.