Segment Information (Entity-Wide Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Customer revenues	$ 176,549	$ 148,353	$ 353,934	$ 295,378
Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	176,549	148,353	353,934	295,378
CAM [Member]
Segment Reporting Information [Line Items]
Customer revenues	47,439	45,632	99,165	88,486
CAM [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	29,387	24,660	58,148	44,541
All other [Member]
Segment Reporting Information [Line Items]
Customer revenues	57,253	32,179	112,264	67,785
All other [Member] | Customer Revenues [Member]
Segment Reporting Information [Line Items]
Customer revenues	$ 33,017	$ 19,801	$ 66,685	$ 41,477