Annual report pursuant to Section 13 and 15(d)

Long Term Debt (Schedule of Long Term Debt Applicable Margin) (Details)

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Long Term Debt (Schedule of Long Term Debt Applicable Margin) (Details)
Dec. 31, 2012
Greator than or equal to 3.75
 
Debt Instrument [Line Items]  
DebtInstrumentBasisSpreadOnVariableRate 4.00%
Greator than or equal to 3.25 but less than or equal to 3.75
 
Debt Instrument [Line Items]  
DebtInstrumentBasisSpreadOnVariableRate 3.50%
Greator than or equal to 2.75 but less than or equal to 3.25
 
Debt Instrument [Line Items]  
DebtInstrumentBasisSpreadOnVariableRate 3.00%
less than 2.75
 
Debt Instrument [Line Items]  
DebtInstrumentBasisSpreadOnVariableRate 2.50%