Segment Information (Entity-Wide Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Customer revenues	$ 193,261	$ 142,305	$ 547,195	$ 437,683
Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	193,261	142,305	547,195	437,683
CAM [Member]
Segment Reporting Information [Line Items]
Customer revenues	46,346	42,574	145,511	131,060
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	27,920	23,671	86,068	68,212
All other [Member]
Segment Reporting Information [Line Items]
Customer revenues	65,328	38,398	177,592	106,183
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	$ 36,639	$ 19,814	$ 103,324	$ 61,291