Defined Benefit Plans Additional Information (Details)	6 Months Ended
Jun. 30, 2015 USD ($)
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year	$ 0

Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2709-114920

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