Commitments and Contingencies Commitments and Contingencies - Loss Contingencies (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Loss Contingency, Information about Litigation Matters [Abstract]
Loss Contingency, Pending Claims, Number	0
Other [Abstract]
Letters of Credit Outstanding, Amount	$ 4.2

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