Long-Term Debt (Details 1) (USD $)			0 Months Ended
	Mar. 01, 2014	Nov. 30, 2013	Apr. 05, 2012 Credit Facility 2012 [Member]	Apr. 05, 2012 Credit Facility 2012 [Member] Credit Facility - Swing Line [Member]	Apr. 05, 2012 Credit Facility 2012 [Member] Credit Facility - Accordion [Member]	Mar. 01, 2014 Credit Facility 2012 [Member] Term Loan [Member]	Nov. 22, 2013 Credit Facility 2012 [Member] Term Loan [Member]	Mar. 01, 2014 Credit Facility 2012 [Member] Letter of Credit Sub-Facility [Member]	Nov. 30, 2013 Credit Facility 2012 [Member] Letter of Credit Sub-Facility [Member]	Apr. 05, 2012 Credit Facility 2012 [Member] Letter of Credit Sub-Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, expiration period			5 years
Maximum borrowing capacity			$ 150,000,000	$ 10,000,000	$ 100,000,000		$ 100,000,000
Long-term debt, amount						80,000,000
Long-term debt, weighted average interest rate						0.91%
Subline Letters of Credit Maximum Capacity										50,000,000
Letters of credit outstanding, amount	$ 29,538,000	$ 28,541,000						$ 16,012,000	$ 16,012,000