Stock-Based Compensation - Additional Information (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2019 shares
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	975
Share-based Compensation Arrangement by Share-based Payment Award, Description	On each vesting date, recipients will receive between 0% and 200% of the granted PSUs in the form of CEC common stock based on the achievement of specified performance and service conditions. Based on the terms and conditions of the awards, the fair value of the PSUs was initially set equal to the quoted market price of our common stock on the date of grant. The grant date fair value is reassessed at each reporting date to reflect the market price of our common stock until a mutual understanding of the key terms and conditions of the awards between the Company and recipient is achieved.
Market-based Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	703
Share-based Compensation Arrangement by Share-based Payment Award, Description	On the vesting date, recipients will receive between 0% and 200% of the granted MSUs in the form of CEC common stock based on the achievement of specified market and service conditions. Based on the terms and conditions of the awards, the grant date fair value of the MSUs was determined using a Monte-Carlo simulation model. Key assumptions for the Monte-Carlo simulation model are the risk-free interest rate, expected volatility, expected dividends and correlation coefficient. The effect of market conditions is considered in determining the grant date fair value, which is not subsequently revised based on actual performance.