Significant Accounting Policies (Details 2)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Foreign Currency Translation
Threshold percentage used to determine if economic environment is highly inflationary	100.00%
Number of years used to determine if economic environment is highly inflationary	3 years
Operating income of Venezuelan subsidiary as percent of consolidated amount high end of range		1.00%