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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Assets Measured at Fair Value On a Recurring Basis

Financial instruments measured at fair value on a recurring basis:

			June 30, 2021																		December 31, 2020
(in thousands)			Total						Level 1						Level 2						Total						Level 1						Level 2
Cash equivalents
Money market funds			$	157,320					$	157,320					$	—					$	5,340					$	5,340					$	—
Municipal debt securities			78,996						—						78,996						34,338						—						34,338
Commercial Paper			66,292						—						66,292						48,908						—						48,908
Federal agency debt securities			—						—						—						51,400						—						51,400
Total cash equivalents			302,608						157,320						145,288						139,986						5,340						134,646
Short-term
Commercial paper			345,809						—						345,809						229,821						—						229,821
Corporate debt securities			217,631						—						217,631						166,768						—						166,768
Municipal debt securities			178,870						—						178,870						87,290						—						87,290
Federal agency debt securities			25,100						—						25,100						48,598						—						48,598
Total short-term			767,410						—						767,410						532,477						—						532,477
Total financial instruments			$	1,070,018					$	157,320					$	912,698					$	672,463					$	5,340					$	667,123

Fair Value, Liabilities Measured on Recurring Basis

Carrying value and estimated fair value of long-term debt, including current maturities and without reduction for related costs, are as follows:

			June 30, 2021												December 31, 2020
(in thousands)			Carrying Value						Estimated Fair Value						Carrying Value						Estimated Fair Value						Hierarchy Level
Non-publicly held debt			$	1,366,042					$	1,170,576					$	1,555,637					$	1,191,008					3

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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No definition available.

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X

- Definition

Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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