The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory, Net, Items Net of Reserve Alternative [Abstract]
Raw materials		$ 150,222	$ 124,441
Total inventories	$ 170,819	196,896	165,336
Increase (decrease) in inventories		30,352	15,097	$ (16,044)
Accounting Standards Update 2014-09 [Member] \| Difference between revenue guidance in effect before and after Topic 606 [Member]
Inventory, Net, Items Net of Reserve Alternative [Abstract]
Total inventories		5,483
Increase (decrease) in inventories	$ 5,500
Drilling fluids [Member]
Inventory, Net, Items Net of Reserve Alternative [Abstract]
Raw materials		148,737	123,022
Mats [Member]
Inventory, Net, Items Net of Reserve Alternative [Abstract]
Raw materials		1,485	1,419
Finished goods		8,586	10,400
Blended drilling fluids components [Member]
Inventory, Net, Items Net of Reserve Alternative [Abstract]
Finished goods		$ 38,088	$ 30,495