Commitments and Contingencies - Letters of Credit (Details) (Standby letters of credit, Building lease and other commitments, USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Standby letters of credit \| Building lease and other commitments
Loss Contingencies [Line Items]
Letter of credit outstanding	$ 1.5

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant