Inventories (Tables)

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]

Schedule of Inventories

	2011		2010
	(In thousands)
Raw materials and components:
Drilling fluids	$	174,659	$	122,490
Mats		623		359
Total raw materials and components		175,282		122,849
Finished goods- mats		647		179
Total	$	175,929	$	123,028