Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative [Line Items]
Interest expense	$ 3,681	$ 2,671	$ 9,610	$ 8,049
Interest Rate Current Swap [Member]
Derivative [Line Items]
Interest expense			1,200	1,500
Interest Rate Swap Buyouts [Member]
Derivative [Line Items]
Interest expense			$ 500