Fair Value Measurements (Details 2) (Investments Valued Using Level 3 Inputs [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2014
Investments Valued Using Level 3 Inputs [Member]
Investments measured at fair value on a recurring basis using significant unobservable inputs (Level 3) [Roll Forward]
Balance at the beginning of the period	$ 0
Total gains and losses included in accumulated other comprehensive income (loss)	1,856
Balance at the end of the period	$ 1,856

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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