Basis Of Presentation Stock-Based Compensation (Details)	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017
Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Award Vesting Period	3 years	4 years
Management [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Award Vesting Period	3 years
Management [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Award Vesting Period	4 years
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Award Vesting Period	3 years	5 years
Director [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Award Vesting Period	3 years
Director [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Award Vesting Period	5 years