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Stock-Based Compensation Stock-Based Compensation - Outstanding at End of Period (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options granted 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      
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 9,735,585 [1] 9,820,168 10,638,219  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 10.29 [2] $ 11.69 [2] $ 12.90  
Number of options granted   0 1,844,332 1,500,770
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 5,886,330 [1] 8,447,922 6,329,435  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 8.00 [2] $ 7.95 [2] $ 12.06  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   6,101,421    
[1] There were no grants of stock options or restricted stock units related to CEC common stock during the three months ended March 31, 2017.
[2] Represents weighted average exercise price for stock options and weighted average fair value for restricted stock units.