Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Commitments [Abstract]
Cost of Services, Environmental Remediation	$ 186

Cost incurred in providing environmental engineering and consulting; environmental testing and analysis; and remediation services during the reporting period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_CostOfServicesEnvironmentalRemediation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration