Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Interest expense	$ 11,841	$ 12,254	$ 15,227
Interest Rate Swap [Member]
Derivative [Line Items]
Interest expense	$ 2,000	$ 1,900