Inventories - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Percentage of LIFO inventory	54.00%	60.00%
Excess of current costs over stated LIFO value	$ 10,646	$ 10,646
Inventory obsolescence reserves	$ 7,014	$ 7,194

Amount of valuation reserve for inventory.

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Name:	us-gaap_InventoryValuationReserves
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant