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FAIR VALUE MEASUREMENTS. (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |  |  |  |
Assets |  | $ 1,155 |  | $ 15,022 |
Liabilities: |  |  |  |  |
Liabilities |  | (5,156) |  |  |
Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets |  | 1,155 |  | 1,765 |
Liabilities: |  |  |  |  |
Liabilities |  | (5,156) |  |  |
Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets |  |  |  | 13,257 |
Liabilities: |  |  |  |  |
Liabilities |  |  |  |  |
Level 3 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets |  |  |  |  |
Liabilities: |  |  |  |  |
Liabilities |  |  |  |  |
Derivative Financial Instrument [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets |  | 1,155 | [1] | 1,765 | [2]
Liabilities: |  |  |  |  |
Liabilities |  | (5,156) | [1] | (6,309) |
Derivative Financial Instrument [Member] | Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets |  | 1,155 | [1] | 1,765 | [2]
Liabilities: |  |  |  |  |
Liabilities |  | (5,156) | [1] | (6,309) |
Derivative Financial Instrument [Member] | Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets |  |  | [1] |  | [2]
Liabilities: |  |  |  |  |
Liabilities |  |  | [1] |  |
Derivative Financial Instrument [Member] | Level 3 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets |  |  | [1] |  | [2]
Liabilities: |  |  |  |  |
Liabilities |  |  | [1] |  |
Defined Benefit Plan Assets Large U.S. Equity [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [3] |  |  | $ 3,621 |
Liabilities: |  |  |  |  |
Benefit plan allocation percentage | [1] |  |  | 27.00% |
Defined Benefit Plan Assets Large U.S. Equity [Member] | Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [3] |  |  |  |
Defined Benefit Plan Assets Large U.S. Equity [Member] | Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [3] |  |  | 3,621 |
Defined Benefit Plan Assets Large U.S. Equity [Member] | Level 3 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [3] |  |  |  |
Defined Benefit Plan Assets Small/Mid U.S. Equity [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [4] |  |  | $ 1,844 |
Liabilities: |  |  |  |  |
Benefit plan allocation percentage | [3] |  |  | 14.00% |
Defined Benefit Plan Assets Small/Mid U.S. Equity [Member] | Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [4] |  |  |  |
Defined Benefit Plan Assets Small/Mid U.S. Equity [Member] | Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [4] |  |  | 1,844 |
Defined Benefit Plan Assets Small/Mid U.S. Equity [Member] | Level 3 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [4] |  |  |  |
Defined Benefit Plan Assets International Equity [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [5] |  |  | $ 2,106 |
Liabilities: |  |  |  |  |
Benefit plan allocation percentage | [4] |  |  | 16.00% |
Defined Benefit Plan Assets International Equity [Member] | Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [5] |  |  |  |
Defined Benefit Plan Assets International Equity [Member] | Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [5] |  |  | 2,106 |
Defined Benefit Plan Assets International Equity [Member] | Level 3 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [5] |  |  |  |
Defined Benefit Plan Assets Fixed Income [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [6] |  |  | $ 5,686 |
Liabilities: |  |  |  |  |
Benefit plan allocation percentage | [5] |  |  | 43.00% |
Defined Benefit Plan Assets Fixed Income [Member] | Level 1 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [6] |  |  |  |
Defined Benefit Plan Assets Fixed Income [Member] | Level 2 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [6] |  |  | 5,686 |
Defined Benefit Plan Assets Fixed Income [Member] | Level 3 [Member] |  |  |  |  |
Assets: |  |  |  |  |
Assets | [6] |  |  |  |
[1] | 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.
[2] | Included in derivative instruments in the consolidated balance sheets.
[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.
[6] | Amounts derived from the audited financial statements for the year ended December 31, 2018.

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