Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segments	Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (in segments) | segments			2
Interest expense	$ 4,351	$ 2,897	$ 11,658	$ 8,229
CAM [Member]
Segment Reporting Information [Line Items]
Interest expense	$ 4,000	$ 2,900	$ 10,900	$ 7,800