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Subsequent Event	6 Months Ended
Subsequent Event	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event: On July 19, 2018 our manufacturing facility in Marshalltown, Iowa was damaged by a tornado. The extent of damage to the facility is being assessed and we currently do not have an estimate of the financial or operational impact of the damage, including any potential insurance recoveries.