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Supplemental balance sheet information (inventories and supplies) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventories and supplies [Abstract]
Raw materials	$ 5,521	$ 5,566
Semi-finished goods	8,653	8,273
Finished goods	6,579	5,301
Supplies, primarily production	3,060	2,903
Inventories and supplies	$ 23,813	$ 22,043

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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