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Long-Term Debt (Percentages Per Annum) (Details) (2014 Credit Facility [Member])
3 Months Ended
Mar. 31, 2014
Level 1
 
Line of Credit Facility [Line Items]  
Debt Ratings A-/A3 or better
Applicable Rate Commitment Fee 0.10%
Base Rate 0.00%
Level 1 | Eurodollar [Member]
 
Line of Credit Facility [Line Items]  
EuroDollar Rate Letter of Credit 1.00%
Level 2
 
Line of Credit Facility [Line Items]  
Debt Ratings BBB+/Baa1
Applicable Rate Commitment Fee 0.125%
Base Rate 0.125%
Level 2 | Eurodollar [Member]
 
Line of Credit Facility [Line Items]  
EuroDollar Rate Letter of Credit 1.125%
Level 3
 
Line of Credit Facility [Line Items]  
Debt Ratings BBB/Baa2
Applicable Rate Commitment Fee 0.175%
Base Rate 0.25%
Level 3 | Eurodollar [Member]
 
Line of Credit Facility [Line Items]  
EuroDollar Rate Letter of Credit 1.25%
Level 4
 
Line of Credit Facility [Line Items]  
Debt Ratings BBB-/Baa3
Applicable Rate Commitment Fee 0.225%
Base Rate 0.50%
Level 4 | Eurodollar [Member]
 
Line of Credit Facility [Line Items]  
EuroDollar Rate Letter of Credit 1.50%
Level 5
 
Line of Credit Facility [Line Items]  
Debt Ratings BB+/Ba1
Applicable Rate Commitment Fee 0.275%
Base Rate 0.625%
Level 5 | Eurodollar [Member]
 
Line of Credit Facility [Line Items]  
EuroDollar Rate Letter of Credit 1.625%
Level 6
 
Line of Credit Facility [Line Items]  
Debt Ratings BB/Ba2 or worse
Applicable Rate Commitment Fee 0.35%
Base Rate 0.75%
Level 6 | Eurodollar [Member]
 
Line of Credit Facility [Line Items]  
EuroDollar Rate Letter of Credit 1.75%