Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Concentration Risk (Details)

v2.4.0.6
Financial Instruments - Concentration Risk (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Concentration Risk [Line Items]  
Letters of Credit Outstanding, Amount $ 10,556
Concentrations of Credit Risk [Abstract]  
Debt Instrument, Description of Variable Rate Basis LIBOR
FASI [Member]
 
Concentrations of Credit Risk [Abstract]  
Number of customers accounting for majority of FASI annual operating revenue 3
Concentration of operating revenue (in hundredths) 61.90%
Fair Value, Concentration of Risk, Accounts Receivable $ 4,379