Valuation And Qualifying Accounts (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Bad debt expense (income)			$ 170,000	$ 1,311,000	$ (56,000)
Valuation Allowances and Reserves, Reserves of Businesses Acquired	0	271,000			0
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	1,201,000	2,355,000	1,201,000	2,355,000	4,196,000
Deductions			(209,000)	(2,736,000)	(1,785,000)
Balance End of Year			1,162,000	1,201,000	2,355,000
Inventory Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	1,327,000	0	1,327,000	0
Valuation Allowances and Reserves, Charged to Cost and Expense			(406,000)	971,000
Deductions			0	0
Balance End of Year			921,000	1,327,000
Valuation Allowances and Reserves, Reserves of Businesses Acquired	$ 0	$ 356,000