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Derivative Instruments and Hedging Activities - Effects on statements of income and consolidated statements of comprehensive income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives recognized in net income (loss) | $ (121) | $ (271) | $ (279)
Nonoperating Income (Expense) | Designated as Hedging Instrument | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in net income (loss) | (196) | (271) | (279)
Nonoperating Income (Expense) | Not Designated as Hedging Instrument | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives recognized in net income (loss) | (308) | 0 | 0
Nonoperating Income (Expense) | Not Designated as Hedging Instrument | Commodity swap contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives recognized in net income (loss) | 36 | 0 | 0
Nonoperating Income (Expense) | Not Designated as Hedging Instrument | Hybrid Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives recognized in net income (loss) | $ 337 | $ 0 | $ 0

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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