Asset Held for Sale and Discontinued Operations (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 31, 2013	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	$ 30,500,000	$ 0	$ 30,452,000		$ 0
Blackfoot
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of employees who joined Blackfoot organization	11
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation		6,700,000
Discontinued Operations, Gain on Disposal of Assets, GAAP		16,700,000
Discontinued Operations, Gain on Disposal of Assets, Tax Basis		27,100,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue			674,000	[1]	7,874,000
Income before income taxes			$ 477,000	[1]	$ 3,813,000

[1] Reflects revenue and income before income taxes of the Idaho-based operations for the period of January 1, 2013 through the completion of the transaction on January 31, 2013.