Commitments and Contingencies Settlement of Litigation (Details) (U.S. Environmental Protection Agency 2006 Notice of Violation, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
U.S. Environmental Protection Agency 2006 Notice of Violation
Loss Contingencies [Line Items]
Litigation Settlement, Amount	$ 332
Civil Penalty, Waived	$ 112

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

No definition available.

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