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Short and Long-Term Debt and Commitments Related to Letters of Credit Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Jul. 22, 2010
Debt instrument [Line Items]      
Revolving credit facility, noncurrent $ 67,000 $ 54,500  
Senior unsecured notes 24,000 30,000 $ 30,000
Term loans 16,151 16,105  
Long-term debt 107,151 100,605  
Less debt issuance costs 333 471  
Less current portion 16,701 15,501  
Long-term debt, excluding current maturities 90,117 84,633  
Swing-line borrowings [Member]      
Debt instrument [Line Items]      
Revolving credit facility, noncurrent 10,000 2,500  
LIBOR borrowings [Member]      
Debt instrument [Line Items]      
Revolving credit facility, noncurrent $ 57,000 $ 52,000