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Balance Sheet Related Information (Tables)

12 Months Ended

Dec. 31, 2011

Balance Sheet Related Information [Abstract]

Allowance for doubtful accounts


		2011				2010				2009
Balance at the beginning of the year		$	6,034			$	5,757			$	5,896
Charged to expense (income)			3,307				2,405				2,561
Write-offs and currency translation adjustments			(2,746)				(2,128)				(2,700)

Balance at the end of the year			6,595				6,034				5,757


		2011				2010
Crude stockpile inventories		$	54,637			$	35,308
In-process and finished goods inventories			65,975				47,510
Other raw material, container, and supplies inventories			25,970				24,697

			146,582				107,515

Inventory, raw materials and supplies, net of reserves


		2011				2010				2009
Balance at the beginning of the year		$	2,730			$	2,136			$	1,989
Charged to costs and expenses			2,126				4,001				917
Disposals and currency translation adjustments			(2,705)				(3,407)				(770)

Balance at the end of the year			2,151				2,730				2,136

Reclamation liability

			00000000000				00000000000
		2011				2010
Balance at beginning of the year		$	7,529			$	6,584
Settlement of obligations			(4,304)				(2,185)
Liabilities incurred and accretion expense			6,454				3,020
Currency translation adjustments			(423)				110

Balance at the end of the year			9,256				7,529

Accrued liabilities

			000000000				000000000
		2011				2010
Bonus		$	9,752			$	8,213
Employee benefits and related costs			9,961				8,498
Dividends payable			5,698				5,612
Other			33,539				32,881

			58,950				55,204

Accumulated other comprehensive income (loss)

			000000000				000000000
		2011				2010
Cumulative foreign currency translation		$	346			$	24,905
Prior service cost on pension plans (net of tax benefit of $113 in 2011 and $134 in 2010)			(195)				(232)
Net actuarial loss on pension plans (net of tax benefit of $6,944 in 2011 and $1,938 in 2010)			(11,912)				(3,358)
Unrealized loss on interest rate swap agreement (net of tax benefit of $3,329 in 2011 and $2,440 in 2010)			(5,710)				(4,226)
Unrealized gain on available-for-sale securities (net of tax expense of $0 in 2011 and $1,022 in 2010)			2,503				11,847

			(14,968)				28,936