Derivatives - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Aug. 05, 2016
Derivative [Line Items]
Deferred taxes used to offset fair value of interest rate swap	$ 300,000	$ 1,500,000
Maturity of derivative contract (up to)	2 years
Revenue and cost of sales
Derivative [Line Items]
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, gross	$ (467,000)
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, net of tax	(347,000)
Interest expense
Derivative [Line Items]
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, gross	933,000
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, net of tax	693,000
Interest rate swap
Derivative [Line Items]
Notional amount of derivative			$ 175,000,000
Fixed rate			1.12%
Other assets (long-term) | Interest rate swap | Designated as hedging instrument
Derivative [Line Items]
Total Asset Derivatives	$ 1,201,000	$ 5,772,000