Income Taxes (Details) $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($)
Tax Year 2014 [Member]
Operating Loss Carryforwards [Line Items]
Net reduction in taxes due to the federal government	$ 17,600

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.

No definition available.

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