Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Liabilities
Interest rate swap	$ 56,058
Deferred compensation plan liabilities	14,983	$ 18,396
Assets
Interest rate swap		16,373
Current Liabilities
Liabilities
Deferred compensation plan liabilities	4,000	4,000
Non-current Liabilities
Liabilities
Deferred compensation plan liabilities	11,000	14,000
Quoted Prices in Active Markets (Level 1)
Liabilities
Interest rate swap	0
Deferred compensation plan liabilities	0	0
Assets
Interest rate swap		0
Significant Other Observable Inputs (Level 2)
Liabilities
Interest rate swap	56,058
Deferred compensation plan liabilities	14,983	18,396
Assets
Interest rate swap		16,373
Significant Unobservable Inputs (Level 3)
Liabilities
Interest rate swap	0
Deferred compensation plan liabilities	$ 0	0
Assets
Interest rate swap		$ 0

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Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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