The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of derivative instruments of a particular group held by the entity.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Derivative Instruments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) derivative	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Recognized deferred losses on derivatives in accumulated other comprehensive income into earnings	$ 0	$ 77,000	$ 1,000
Interest rate swap agreement $440 million
Derivative [Line Items]
Fair value of derivatives	2,768,000	1,475,000
Ineffective portion of derivative contracts	0
Interest rate swap agreement $440 million \| Payables and accrued liabilities \| Cash Flow Hedges
Derivative [Line Items]
Fair value of derivatives	2,800,000
Interest rate swap agreement $440 million \| Other long-term obligations \| Cash Flow Hedges
Derivative [Line Items]
Fair value of derivatives		$ 1,500,000
Derivative number of instruments held \| derivative		2
Interest rate swap agreement $200 million
Derivative [Line Items]
Fair value of derivatives	1,259,000	$ 663,000
Interest rate swap agreement $200 million \| Payables and accrued liabilities \| Cash Flow Hedges
Derivative [Line Items]
Fair value of derivatives	1,300,000
Interest rate swap agreement $200 million \| Other long-term obligations \| Cash Flow Hedges
Derivative [Line Items]
Fair value of derivatives		700,000
Interest rate cap agreement
Derivative [Line Items]
Fair value of derivatives	$ 0	0
Recognized deferred losses on derivatives in accumulated other comprehensive income into earnings		$ 76,000