Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Accounting Policies Accounts Receivable (Details) - Largest customer [Member] - Customer Concentration Risk [Member]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of Customers more than 10%	0	0
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Number of Customers more than 10%	0	0	0