Acquisition (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
	Feb. 17, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Cash and stock consideration		$ 43,530	$ 0
Ahmann & Martin Co. [Member]
Business Acquisition [Line Items]
Cash and stock consideration	$ 48,000
Maximum contingent consideration	$ 8,000
Goodwill acquired		40,000
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Other intangible assets, additions during the period		12,115		$ 0
Ahmann & Martin Co. [Member]
Business Acquisition [Line Items]
Other intangible assets, additions during the period		$ 12,000