Segment Information Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segments	Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (in segments) | segments			2
Interest expense	$ 2,684	$ 3,309	$ 8,588	$ 10,613
CAM [Member]
Segment Reporting Information [Line Items]
Interest expense	$ 2,300	$ 2,800	$ 7,200	$ 9,100