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Notes Payable and Related Credit Agreement - Components (Details) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Apr. 05, 2012
Revolving Credit Facility
Dec. 31, 2013
Revolving Credit Facility
Line of Credit
Revolver Facility Expiring April 5, 2017
Dec. 31, 2012
Revolving Credit Facility
Line of Credit
Revolver Facility Expiring April 5, 2017
Apr. 05, 2012
Term Loan
Dec. 31, 2013
Term Loan
Line of Credit
Term Loan Due April 5, 2018
Dec. 31, 2012
Term Loan
Line of Credit
Term Loan Due April 5, 2018
Dec. 31, 2013
Standby Letters of Credit
Dec. 31, 2012
Standby Letters of Credit
Dec. 31, 2013
Secured Debt
Debt Instrument [Line Items]                      
Total credit agreement debt $ 159,620,000 $ 159,620,000   $ 10,000,000 $ 0   $ 149,620,000 $ 159,620,000      
Less unamortized discount on the Term Loan (948,000) (1,442,000)                  
Less current portion of notes payable, including Revolver (10,000,000) 0                  
Long-term portion of notes payable 148,672,000 158,178,000                  
Credit facility, available 75,000,000   50,000,000 50,000,000   200,000,000 200,000,000        
Maturity date     Apr. 05, 2017 Apr. 05, 2017   Apr. 05, 2018 Apr. 05, 2018        
Weighted average interest rate             3.17% 5.97%      
Letters of Credit                 $ 27,691,000 $ 31,879,000 $ 18,176,000