Debt (Bank Of America Credit Facility) (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Mar. 05, 2019	Mar. 03, 2016	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Contractual facility			$ 290,879	$ 252,929
Bank Of America Credit Facility [Member]
Debt Instrument [Line Items]
Contractual facility		$ 55,000	$ 55,000	$ 55,000
Reduced leverage ratio		0.25%
Earliest period subjected to repayment of borrowings			18 months
Extension period	6 months