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FAIR VALUE MEASUREMENTS. (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of recurring fair value measurements | The following table summarizes recurring fair value measurements by level at September 30, 2019 (in thousands):
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments(1) |  | $ | 2,790 |  |  | $ | 2,790 |  |  | $ | — |  |  | $ | — |
|  | $ | 2,790 |  |  | $ | 2,790 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments(1) |  | $ | (3,619 | ) |  | $ | (3,619 | ) |  | $ | — |  |  | $ | — |
|  | $ | (3,619 | ) |  | $ | (3,619 | ) |  | $ | — |  |  | $ | — |
The following table summarizes recurring fair value measurements by level at December 31, 2018 (in thousands):
|  |  |  |  |  |  |  |  |  |  |  |  |  | Benefit Plan |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Percentage |
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Allocation |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments(1) |  | $ | 1,765 |  |  | $ | 1,765 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Defined benefit plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(pooled separate accounts): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Large U.S. Equity(2) |  |  | 3,621 |  |  |  | — |  |  |  | 3,621 |  |  |  | — |  |  |  | 27 | %
Small/Mid U.S. Equity(3) |  |  | 1,844 |  |  |  | — |  |  |  | 1,844 |  |  |  | — |  |  |  | 14 | %
International Equity(4) |  |  | 2,106 |  |  |  | — |  |  |  | 2,106 |  |  |  | — |  |  |  | 16 | %
Fixed Income(5) |  |  | 5,686 |  |  |  | — |  |  |  | 5,686 |  |  |  | — |  |  |  | 43 | %
|  | $ | 15,022 |  |  | $ | 1,765 |  |  | $ | 13,257 |  |  | $ | — |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  | $ | (6,309 | ) |  | $ | (6,309 | ) |  | $ | — |  |  | $ | — |  |  |  |  |
| (1) | Included in derivative instruments in the consolidated balance sheets.
| (2) | This category includes investments in funds comprised of equity securities of large U.S. companies. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.
| (3) | This category includes investments in funds comprised of equity securities of small- and medium-sized U.S. companies. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.
| (4) | This category includes investments in funds comprised of equity securities of foreign companies including emerging markets. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.
| (5) | This category includes investments in funds comprised of U.S. and foreign investment-grade fixed income securities, high-yield fixed income securities that are rated below investment-grade, U.S. treasury securities, mortgage-backed securities, and other asset-backed securities. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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