Acquisitions and Divestitures (Details Textual) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015 USD ($) facility	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Business Acquisition [Line Items]
Number of facilities disposed \| facility	6
Gain recognized	$ 7.8	$ 0.0	$ 7.8	$ 0.0

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

No definition available.

Name:	us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration