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Financial Instruments - Effect on Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Amount of gain (loss) recognized in OCI on derivatives |  |  |  |
Amount of gain (loss) recognized in OCI on derivatives | $ 393 | $ (1,870) | $ 3,878 | $ (5,499)
Amount of gain (loss) reclassified from AOCI into income |  |  |  |
Amount of gain (loss) reclassified from AOCI into income | (101) | (107) | (265) | (126)
Interest rate caps |  |  |  |
Amount of gain (loss) recognized in OCI on derivatives |  |  |  |
Amount of gain (loss) recognized in OCI on derivatives | 93 | (1,842) | 3,396 | (4,712)
Interest rate caps | Interest expense |  |  |  |
Amount of gain (loss) reclassified from AOCI into income |  |  |  |
Amount of gain (loss) reclassified from AOCI into income | (71) | (13) | (164) | (22)
Natural gas swaps |  |  |  |
Amount of gain (loss) recognized in OCI on derivatives |  |  |  |
Amount of gain (loss) recognized in OCI on derivatives | 300 | (28) | 482 | (787)
Natural gas swaps | Cost of goods sold |  |  |  |
Amount of gain (loss) reclassified from AOCI into income |  |  |  |
Amount of gain (loss) reclassified from AOCI into income | $ (30) | $ (94) | $ (101) | $ (104)

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- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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