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Commercial Mortgage Residual Interests (Schedule of Amounts Recognized as Unrealized Gains and/or Losses Recorded as Other Comprehensive Income and Other Than Temporary Valuation Impairments Recorded in Earnings) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commercial Mortgage Residual Interests [Abstract] |  |  |
Unrealized gains | $ 875 nnn_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnResidualInterestOfSecuritizationArisingDuringPeriodNetOfTax | $ 511 nnn_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnResidualInterestOfSecuritizationArisingDuringPeriodNetOfTax | $ 1,132 nnn_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnResidualInterestOfSecuritizationArisingDuringPeriodNetOfTax
Other than temporary valuation impairment | $ 256 us-gaap_ImpairmentOfRetainedInterest | $ 1,185 us-gaap_ImpairmentOfRetainedInterest | $ 2,812 us-gaap_ImpairmentOfRetainedInterest

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- Details
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- Definition Other comprehensive Income - Unrealized gain/loss on interest in financial instruments (typically securitized receivables) that continue to be held during the period. + References No definition available. + Details
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- Definition The charge against earnings to reduce the carrying value of an interest continued to be held by the transferor in a securitized financial instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 40 -Section 35 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=16385214&loc=d3e44297-111616 + Details
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