Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Interest expense (income)	$ (3,987)	$ (4,621)	$ (13,035)	$ (13,530)
Interest Rate Current Swap [Member]
Derivative [Line Items]
Interest expense (income)			(800)	600
Interest Rate Swap Buyouts [Member]
Derivative [Line Items]
Interest expense (income)			$ (300)	$ (500)