Commitments and Contingencies (Narrative) (Details)	12 Months Ended
Dec. 31, 2014 potentially_responsible_party
Landfill Lawsuit
Loss Contingencies
Number of potentially responsible parties	1
Landfill
Loss Contingencies
Loss Contingency, Pending Claims, Number	2

Number of pending claims pertaining to a loss contingency.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Name:	us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant