Hurricane Sandy (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
May 14, 2013	Mar. 31, 2013
Hurricane Sandy
Capital additions related to Hurricane Sandy		$ 0.5
Insurance proceeds recorded as a gain	$ 0.3

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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 210.5-03.3)

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

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