Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net deferred tax asset position	$ 3,189us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 4,654us-gaap_DeferredTaxAssetsLiabilitiesNet
Unrecognized deferred tax liabilities, gross	2,520
Unrecognized deferred tax liabilities, net	$ 857nsec_UnrecognizedDeferredTaxLiabilities

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Name:	us-gaap_DeferredTaxAssetsLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant