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Schedule of Acquisition Preliminary Purchase Price Allocation(Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Apr. 22, 2016
Business Acquisition [Line Items]      
Goodwill $ 105,655 $ 105,655  
Second Montana Acquisition [Member]      
Business Acquisition [Line Items]      
Cash and other current assets     $ 404
Property and equivalents     7,839
Intangible assets     11,400
Goodwill     6,013
Total acquired assets     $ 25,656