Discontinued Operations (Details)	3 Months Ended			1 Months Ended		3 Months Ended		12 Months Ended			3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Venezuela USD ($)	Aug. 31, 2012 Venezuela USD ($)	Mar. 31, 2013 Venezuela USD ($)	Mar. 31, 2012 Venezuela USD ($)	Dec. 31, 2012 Venezuela USD ($)	Feb. 28, 2013 Venezuela VEB	Dec. 31, 2012 Venezuela VEB	Mar. 31, 2013 Canada USD ($)	Mar. 31, 2012 Canada USD ($)	Dec. 31, 2012 Canada USD ($)
Discontinued Operations
Sale price of expropriated assets					$ 441,700,000
Initial payment received from sale of expropriated assets					176,700,000
Remitted amount					50,000,000
Installment payments received from sale of expropriated assets				34,300,000				16,800,000
Prepayment of second quarter installment payment received				17,200,000
Remaining expected proceeds from sale of expropriated assets						215,000,000
Translation gain						1,400,000
Exchange rate used for remeasurement of net liabilities									6.3	4.3
Impairments of long-lived assets											2,100,000
Summary of operating results of the discontinued operations
Revenue	10,828,000	11,274,000									10,828,000	11,274,000
Expenses and selling, general and administrative	11,266,000	14,023,000				227,000	172,000				11,039,000	13,851,000
Loss (recovery) attributable to expropriation and impairments	(31,123,000)	13,000				(33,199,000)	13,000				2,076,000
Other (income) loss, net	(2,558,000)	(686,000)				(2,592,000)					34,000	(686,000)
Provision for (benefit from) income taxes	(7,000)	(914,000)					440,000				(7,000)	(1,354,000)
Income (loss) from discontinued operations, net of tax	33,250,000	(1,162,000)				35,564,000	(625,000)				(2,314,000)	(537,000)
Summary of balance sheet data for discontinued operations
Cash	328,000		904,000	134,000		134,000		113,000			194,000		791,000
Accounts receivable	8,617,000		9,165,000	13,000		13,000		17,000			8,604,000		9,148,000
Inventory	10,319,000		9,826,000								10,319,000		9,826,000
Other current assets	1,730,000		1,851,000	14,000		14,000		41,000			1,716,000		1,810,000
Total current assets associated with discontinued operations	20,994,000		21,746,000	161,000		161,000		171,000			20,833,000		21,575,000
Property, plant and equipment	273,000										273,000
Intangible and other long-term assets	24,000										24,000
Total assets associated with discontinued operations	21,291,000		21,746,000	161,000		161,000		171,000			21,130,000		21,575,000
Accounts payable	3,278,000		3,844,000	367,000		367,000		499,000			2,911,000		3,345,000
Accrued liabilities	5,823,000		7,059,000	2,558,000		2,558,000		4,335,000			3,265,000		2,724,000
Deferred revenues	681,000		669,000								681,000		669,000
Total current liabilities associated with discontinued operations	9,782,000		11,572,000	2,925,000		2,925,000		4,834,000			6,857,000		6,738,000
Other long-term liabilities	933,000		1,044,000	340,000		340,000		455,000			593,000		589,000
Total liabilities associated with discontinued operations	$ 10,715,000		$ 12,616,000	$ 3,265,000		$ 3,265,000		$ 5,289,000			$ 7,450,000		$ 7,327,000