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Fair Value Measurements (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair Value Measurements (Textual) [Abstract]
Cash held in banks	$ 22.2	$ 4.5
Period for contractual maturities of the company's available-for-sale securities	1 year	1 year

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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