Description of Business and Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 31, 2018	Dec. 30, 2018
Recently Adopted Accounting Guidance [Abstract]
Operating Lease, Right-of-Use Asset	$ 546,624		$ 546,624		$ 557,100
Operating Lease, Liability						$ 590,800
cec_CAMexpenses	$ 3,600	$ 3,400	$ 7,100	$ 7,000