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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2016
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table summarizes our financial assets and liabilities that are measured at fair value on a recurring basis and the fair value measurements, by level, within the fair value hierarchy as of March 31, 2016 and December 31, 2015:
|  |  |  | Fair Value Measurements Using:
As of March 31, 2016 |  | Fair Value |  | Quoted- Prices- in Active Markets (Level 1) |  | Significant- Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
(in thousands) |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Investments—equity securities |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |
Investments—guaranteed income fund |  | $ | 525 |  |  | $ | — |  |  | $ | — |  |  | $ | 525 |
Investments—mutual funds and other |  | $ | 3,129 |  |  | $ | 3,129 |  |  | $ | — |  |  | $ | — |
Mark-to-market energy assets, incl. put options and swap agreements |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |
Mark-to-market energy liabilities incl. swap agreements |  | $ | 423 |  |  | $ | — |  |  | $ | 423 |  |  | $ | — |
|  |  |  | Fair Value Measurements Using:
As of December 31, 2015 |  | Fair Value |  | Quoted- Prices- in Active Markets (Level 1) |  | Significant- Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
(in thousands) |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Investments—equity securities |  | $ | 18 |  |  | $ | 18 |  |  | $ | — |  |  | $ | — |
Investments—guaranteed income fund |  | $ | 279 |  |  | $ | — |  |  | $ | — |  |  | $ | 279 |
Investments—mutual funds and other |  | $ | 3,347 |  |  | $ | 3,347 |  |  | $ | — |  |  | $ | — |
Mark-to-market energy assets, incl. put/call options |  | $ | 153 |  |  | $ | — |  |  | $ | 153 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |
Mark-to-market energy liabilities, incl. swap agreements |  | $ | 433 |  |  | $ | — |  |  | $ | 433 |  |  | $ | — |
Summary of Changes in Fair Value of Investments | The following table sets forth the summary of the changes in the fair value of Level 3 investments for the three months ended March 31, 2016 and 2015:
| Three Months Ended March 31,
| 2016 |  | 2015
(in thousands) |  |  |
Beginning Balance | $ | 279 |  |  | $ | 287 |
Purchases and adjustments | 2 |  |  | (5 | )
Transfers | 242 |  |  | (3 | )
Investment income | 2 |  |  | 1 |
Ending Balance | $ | 525 |  |  | $ | 280 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL7498348-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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