Financing Arrangements (Details) (USD $)	9 Months Ended	3 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Revolving credit facility	Jul. 05, 2013 Revolving credit facility item	Apr. 25, 2011 Revolving credit facility	Jul. 05, 2013 Term Loan
Financial Arrangements
Maximum borrowing capacity under the credit facility				$ 30,000,000
Early termination fee		300,000
Number of letters of credit cash collateralized			2
Term					3 years
Amount of loan					15,000,000
Loan proceeds held in restricted interest reserve escrow	(825,000)				800,000
Debt issuance costs	$ (473,000)				$ 200,000
Interest rate per annum (as a percent)					5.50%
Amortization schedule					10 years