Commitments and Contingencies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended				1 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Deere and Company v Bush Hog LLC and Great Plains Manufacturing Inc	Dec. 31, 2012 Unfavorable litigation action
Loss Contingencies [Line Items]
Rental expense for operating leases		$ 2,293,000	$ 2,088,000	$ 1,879,000
Purchase obligations		83,105,000
Amount of unjust enrichment per federal district court						1,000,000
Legal fees incurred	$ 2,400,000				$ 2,100,000