Debt And Financing - Price Grid (Details) - Credit Agreement Amendment, July 26, 2017	12 Months Ended
	Dec. 31, 2018
Leverage Ratios [Abstract]
December 31, 2018	3.50
March 31, 2019	3.25
June 30, 2019	3.25
September 30, 2019	3.25
December 31, 2019	3.00
March 31, 2020	3
June 30, 2020	3
September 30, 2020	2.75
December 31, 2020	2.75
March 31, 2021	2.75
June 30, 2021 and thereafter	2.50
Total Leverage Ratio	2.64