Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Assets measured at fair value on a recurring basics) (Details)

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Financial Instruments (Assets measured at fair value on a recurring basics) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan assets (mutual funds) $ 1,871 $ 2,183
Total assets at fair value 1,871 2,183
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan assets (mutual funds) 0 0
Total assets at fair value 0 0
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan assets (mutual funds) 0 0
Total assets at fair value $ 0 $ 0