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FAIR VALUE MEASUREMENTS. (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of fair value measurements |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Benefit Plan |
|  | Fair |  |  |  |  |  |  |  |  |  |  |  | Percentage |
|  | Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Allocation |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments(1) |  | $ | 998 |  |  | $ | 998 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Defined benefit plan assets(2) (pooled separate accounts): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Large U.S. Equity(3) |  |  | 3,748 |  |  |  | — |  |  |  | 3,748 |  |  |  | — |  |  |  | 27 | %
Small/Mid U.S. Equity(4) |  |  | 2,018 |  |  |  | — |  |  |  | 2,018 |  |  |  | — |  |  |  | 14 | %
International Equity(5) |  |  | 2,528 |  |  |  | — |  |  |  | 2,528 |  |  |  | — |  |  |  | 18 | %
Fixed Income(6) |  |  | 5,664 |  |  |  | — |  |  |  | 5,664 |  |  |  | — |  |  |  | 41 | %
|  | $ | 14,956 |  |  | $ | 998 |  |  | $ | 13,958 |  |  | $ | — |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments(7) |  | $ | (2,307 | ) |  | $ | (2,307 | ) |  | $ | — |  |  | $ | — |  |  |  |  |
The following table summarizes recurring fair value measurements by level at December 31, 2016 (in thousands):
|  |  |  |  |  |  |  |  |  |  |  |  |  | Benefit Plan |
|  | Fair |  |  |  |  |  |  |  |  |  |  |  | Percentage |
|  | Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Allocation |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments(1) |  | $ | 978 |  |  | $ | 978 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Defined benefit plan assets(2) (pooled separate accounts): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Large U.S. Equity(3) |  |  | 3,134 |  |  |  | — |  |  |  | 3,134 |  |  |  | — |  |  |  | 25 | %
Small/Mid U.S. Equity(4) |  |  | 1,802 |  |  |  | — |  |  |  | 1,802 |  |  |  | — |  |  |  | 15 | %
International Equity(5) |  |  | 2,006 |  |  |  | — |  |  |  | 2,006 |  |  |  | — |  |  |  | 16 | %
Fixed Income(6) |  |  | 5,481 |  |  |  | — |  |  |  | 5,481 |  |  |  | — |  |  |  | 44 | %
|  | $ | 13,401 |  |  | $ | 978 |  |  | $ | 12,423 |  |  | $ | — |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants(8) |  | $ | (651 | ) |  | $ | — |  |  | $ | — |  |  | $ | (651 | ) |  |  |  |
Derivative financial instruments(7) |  |  | (4,115 | ) |  |  | (4,115 | ) |  |  | — |  |  |  | — |  |  |  |  |
|  | $ | (4,766 | ) |  | $ | (4,115 | ) |  | $ | — |  |  | $ | (651 | ) |  |  |  |
| (1) | Included in derivative assets in the consolidated balance sheets.
| (2) | See Note 9 for accounting discussion.
| (3) | 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.
| (4) | 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.
| (5) | 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.
| (6) | 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.
| (7) | Included in derivative liabilities in the consolidated balance sheets.
| (8) | Included in warrant liabilities at fair value in the consolidated balance sheets.
Schedule of significant assumptions | Significant assumptions used and related fair values for the warrants as of December 31, 2016 were as follows:
Original Issuance |  | Exercise Price |  |  | Volatility |  |  | Risk Free Interest Rate |  |  | Term (years) |  |  | Market Discount |  |  | Warrants Outstanding |  |  | Fair Value |
07/3/2012 |  | $ | 6.09 |  |  |  | 40.9 | % |  |  | 0.62 | % |  |  | 0.50 |  |  |  | 11.3 | % |  |  | 211,000 |  |  | $ | 651,000 |
Schedule of level 3 fair value schedule | The changes in the Company’s fair value of its Level 3 inputs with respect to its warrants were as follows (in thousands):
|  | Warrants |
Balance, December 31, 2014 |  | $ | 1,986 |
Exercises of warrants |  |  | (72 | )
Expiration of warrants |  |  | (527 | )
Adjustments to fair value for the period |  |  | (1,114 | )
Balance, December 31, 2015 |  | $ | 273 |
Exercises of warrants |  |  | (179 | )
Adjustments to fair value for the period |  |  | 557 |
Balance, December 31, 2016 |  | $ | 651 |
Exercises of warrants |  |  | (178 | )
Adjustments to fair value for the period |  |  | (473 | )
Balance, December 31, 2017 |  | $ | — |

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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + 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 (d)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: 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=66048111&loc=d3e19190-110258 + Details
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