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Summary of Intangible Assets Acquired and Weighted Average Useful Lives of Definite-lived Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 22, 2016	Jan. 29, 2016
Initial Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets As Recorded, at Fair Value		$ 14,400
Second Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets As Recorded, at Fair Value	$ 11,400
Customer Relationships [Member] | Initial Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets		15 years
Intangible Assets As Recorded, at Fair Value		$ 9,800
Customer Relationships [Member] | Second Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets	15 years
Intangible Assets As Recorded, at Fair Value	$ 9,100
Noncompete Agreements [Member] | Initial Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets		5 years
Intangible Assets As Recorded, at Fair Value		$ 3,900
Noncompete Agreements [Member] | Second Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets	5 years
Intangible Assets As Recorded, at Fair Value	$ 1,800
Trade Names [Member] | Initial Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets		4 years
Intangible Assets As Recorded, at Fair Value		$ 500
Trade Names [Member] | Second Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets	4 years
Intangible Assets As Recorded, at Fair Value	$ 200
Other [Member] | Initial Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets		15 years
Intangible Assets As Recorded, at Fair Value		$ 200
Other [Member] | Second Montana Acquisition [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Lives of Definite-lived Intangible Assets	15 years
Intangible Assets As Recorded, at Fair Value	$ 300

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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