Borrowing Arrangements (Details 5) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Borrowing Arrangements
Liability to make principal payments on debt outstanding in 2013	$ 16,107,000	$ 19,565,000
Liability to make principal payments on debt outstanding in 2016	47,900,000
Liability to make principal payments on debt outstanding in 2018	$ 200,000

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant