Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segments	Jun. 30, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (in segments) | segments			2
Interest expense	$ 3,759	$ 2,633	$ 7,307	$ 5,332
CAM [Member]
Segment Reporting Information [Line Items]
Interest expense	$ 3,500	$ 2,600	$ 6,900	$ 4,900