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Lubbock, Texas (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Interruption Loss [Line Items]
Property and equipment	$ 231,584,000		$ 233,667,000
Gain on insurance recovery	1,170,000	$ 0
Lubbock, Texas Interruption Loss [Member]
Business Interruption Loss [Line Items]
Property and equipment				$ 0
Gain on insurance recovery		$ 0
Lubbock, Texas Interruption Loss [Member] | Inventory Business Interruption and Other Expenses [Member]
Business Interruption Loss [Line Items]
Gain on insurance recovery			1,100,000
Lubbock, Texas Interruption Loss [Member] | Business Interruption and Other Expenses [Member]
Business Interruption Loss [Line Items]
Gain on insurance recovery	200,000
Lubbock, Texas Interruption Loss [Member] | Building [Member]
Business Interruption Loss [Line Items]
Gain on insurance recovery	$ 1,000,000		$ 2,300,000

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The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64839914&loc=d3e16285-107787

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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