Contingent Consideration Payments On 2014 Acquisition (Narrative) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Oct. 14, 2014	Sep. 30, 2015	Dec. 31, 2014	Apr. 03, 2015
Business Acquisition [Line Items]
Contingent consideration		$ 0.0	$ 1.9
Contingent consideration paid				$ 1.0
PDI [Member]
Business Acquisition [Line Items]
Date of acquisition		Oct. 14, 2014
Cash paid	$ 13.0
Working capital adjustment	0.1
PDI [Member] | Backlog In The Amount Of At Least $5 Million [Member]
Business Acquisition [Line Items]
Contingent consideration	1.0
PDI [Member] | Backlog In The Amount Of At Least $15 Million [Member]
Business Acquisition [Line Items]
Contingent consideration	2.0
Minimum [Member] | PDI [Member] | Backlog In The Amount Of At Least $5 Million [Member]
Business Acquisition [Line Items]
Intangible asset amount	5.0
Minimum [Member] | PDI [Member] | Backlog In The Amount Of At Least $15 Million [Member]
Business Acquisition [Line Items]
Intangible asset amount	$ 15.0