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Commitments and Contingencies - Purchase Obligations and Employee Relations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Collective bargaining arrangements
Unrecorded Unconditional Purchase Obligation	$ 51,400,000
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	$ 50,200,000
Percentage of employees represented by labor unions	14.00%
Primary Revolving Credit Facility
Collective bargaining arrangements
Long-term Debt	$ 700,000	$ 800,000

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Represents the percentage of employees who are represented by labor unions.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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-Topic 440
-SubTopic 10
-Section 50
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