Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative [Line Items]
Interest expense	$ 4,328	$ 2,238
Interest Rate Current Swap [Member]
Derivative [Line Items]
Interest expense	400	$ 300
Interest Rate Swap Buyouts [Member]
Derivative [Line Items]
Interest expense	$ 200