Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative [Line Items]
Interest expense	$ 3,691	$ 2,702	$ 5,929	$ 5,378
Interest Rate Current Swap [Member]
Derivative [Line Items]
Interest expense			600	1,000
Interest Rate Swap Buyouts [Member]
Derivative [Line Items]
Interest expense			$ 100