Compensation Plans Outstanding Longer Term Incentive Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Outstanding Long Term Incentive Awards [Line Items]
Target Shares Issuable as Long Term Incentive Awards	$ 15,726	$ 53,767
Maximum Shares Issuable as Long Term Incentive Awards	31,452	66,827
Unrecognized Compensation Cost - Long Term Incentives	$ 862,000	$ 939,000
Share-based Compensation Arrangement By Share-based Payment Award, Grants In Period, Weighted Average Grant Date Fair Value	$ 50,190	$ 40,720