Segment Information Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segments	Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments (in segments) | segments			2
Interest expense	$ 2,839	$ 3,481	$ 5,904	$ 7,304
CAM [Member]
Segment Reporting Information [Line Items]
Interest expense	$ 2,400	$ 3,000	$ 5,000	$ 6,300