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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Activities: |  |  |  |  |  |  |
Consolidated net loss | $ (51,524) |  | $ (33,405) | $ (67,936) |  | $ (38,074) | $ 1,526
Adjustments to reconcile consolidated net income (loss) to cash provided by operating activities: |  |  |  |  |  |  |
Depreciation and amortization of intangibles | 35,944 |  | 30,635 |  |  |  | 35,441
Deferred income taxes |  |  | (563) | 27 |  | 169 | (1,122)
Amortization of debt discount | 539 |  | 539 | 720 |  | 636 | 2,322
Amortization of deferred financing fees | 566 |  | 754 | 900 |  | 503 | 137
Non-cash compensation | 2,103 |  | 2,579 | 3,438 |  | 3,828 | 2,616
(Gain) loss on derivative instruments | (1,565) |  | 4,362 |  |  |  |
Bad debt expense | 27 |  | 44 | 45 |  | 5 | 306
Depreciation |  |  |  | 40,849 |  | 38,651 | 35,441
Fair value adjustments |  |  |  |  |  | (473) | 557
Inventory valuation |  |  |  | (350) |  | 2,678 |
Change in fair value on commodity derivative instruments |  |  |  | 6,714 |  | 2,077 | 1,984
Interest expense added to plant term debt |  |  |  |  |  |  | 9,451
Changes in operating assets and liabilities: |  |  |  |  |  |  |
Accounts receivable | (370) |  | 12,656 | 12,663 |  | 17,562 | (25,235)
Inventories | (4,689) |  | 6,784 | 4,080 |  | 5,070 | 750
Prepaid expenses and other assets | 5,836 |  | (2,454) | (3,880) |  | 2,677 | 3,189
Prepaid inventory | (101) |  | 1,839 | 191 |  | 6,738 | (3,973)
Operating leases | (7,646) |  |  |  |  |  |
Accounts payable and accrued expenses | (6,323) |  | 2,307 | 4,105 |  | (5,538) | 9,279
Net cash provided by (used in) operating activities | (27,203) |  | 26,077 | 1,566 |  | 36,509 | 37,228
Investing Activities: |  |  |  |  |  |  |
Additions to property and equipment | (2,144) |  | (10,874) | (15,154) |  | (20,866) | (19,171)
Purchase of ICP, net of cash acquired |  |  |  |  |  | (29,574) |
Proceeds from cash collateralized letters of credit |  |  |  |  |  |  | 4,574
Net cash used in investing activities | (2,144) |  | (10,874) | (15,154) |  | (50,440) | (14,597)
Financing Activities: |  |  |  |  |  |  |
Net proceeds from Kinergy's line of credit | 22,629 |  | 9,880 | 7,578 |  | (385) | (11,141)
Proceeds from issuance of common stock | 3,670 |  |  | 2,057 |  |  |
Proceeds from CoGen contract amendment | 8,036 |  |  |  |  |  |
Proceeds from assessment financing |  |  | 728 | 2,043 |  | 5,618 | 2,096
Principal payments on borrowings | (11,748) |  | (17,500) |  |  |  |
Payments on capital leases |  |  | (761) | (772) |  | (626) | (7,089)
Preferred stock dividends paid | (946) |  | (946) | (1,265) |  | (1,265) | (1,269)
Proceeds from warrant and option exercises |  |  |  |  |  | 1,202 | 1,164
Payments on assessment financing |  |  |  | (415) |  |  |
Proceeds from plant term and revolving credit agreements |  |  |  |  |  | 42,000 | 97,000
Proceeds from parent notes |  |  |  |  |  | 13,530 | 53,350
Payments on plant borrowings |  |  |  | (16,500) |  | (59,927) | (172,073)
Payments on senior notes |  |  |  | (2,000) |  |  |
Sale of noncontrolling interests |  |  |  |  |  |  | 30,000
Debt issuance costs |  |  |  |  |  | (986) | (1,960)
Net cash provided by (used in) financing activities | 21,641 |  | (8,599) | (9,274) |  | (839) | (9,922)
Net change in cash and cash equivalents | (7,706) |  | 6,604 | (22,862) |  | (14,770) | 12,709
Cash and cash equivalents at beginning of period | 26,627 | [1] | 49,489 | 49,489 |  | 64,259 | 51,550
Cash and cash equivalents at end of period | 18,921 |  | 56,093 | 26,627 | [1] | 49,489 | 64,259
Supplemental Cash Flow Information: |  |  |  |  |  |  |
Interest paid | 13,877 |  | 11,299 | 15,147 |  | 11,133 | 11,168
Income tax refunds received |  |  | 743 | 743 |  | 5,614 | 4,784
Noncash financing and investing activities: |  |  |  |  |  |  |
Initial right of use assets and liabilities recorded under ASC 842 | $ 43,753 |  |  |  |  |  |
Capital leases added to plant and equipment |  |  |  |  |  | 180 |
Reclass of warrant liability to equity upon exercises |  |  |  |  |  | 178 | 179
Contribution of property and equipment for noncontrolling interest (see Note 2) |  |  |  |  |  |  | 16,500
Debt issued in ICP acquisition (see Note 2) |  |  |  |  |  | $ 46,927 |
[1] | Amounts derived from the audited consolidated financial statements for the year ended December 31, 2018.

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow (outflow) from (to) a noncontrolling interest. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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