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Employee Benefit Plans - Summary of reconciliation of Level 3 assets held during year (Details 8) - Retirement Income Plan - Level 3 - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance | $ 4,345 | $ 2,705
Net Realized and Unrealized Gains/(Losses) | 349 | 154
Net Purchases, Issuances and Settlements | $ (1,025) | $ 1,486
Net Transfers In to (Out of) Level 3 |  |
Balance | $ 3,669 | $ 4,345
Real Estate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance | 3,420 | 2,705
Net Realized and Unrealized Gains/(Losses) | 279 | 133
Net Purchases, Issuances and Settlements | $ (1,475) | $ 582
Net Transfers In to (Out of) Level 3 |  |
Balance | $ 2,224 | $ 3,420
Alternative/Opportunistic/Special funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance | 925 |
Net Realized and Unrealized Gains/(Losses) | 70 | $ 21
Net Purchases, Issuances and Settlements | $ 450 | $ 904
Net Transfers In to (Out of) Level 3 |  |
Balance | $ 1,445 | $ 925

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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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