Long-Term Debt (Percentages Per Annum) (Details)	9 Months Ended
	Sep. 30, 2014
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.90%
Eurodollar [Member]
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.00%
Level 1 [Member]
Line of Credit Facility [Line Items]
Debt Ratings	A-/A3 or better
Applicable Rate Commitment Fee	0.10%
Base Rate	0.00%
Level 1 [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.00%
Level 2 [Member]
Line of Credit Facility [Line Items]
Debt Ratings	BBB+/Baa1
Applicable Rate Commitment Fee	0.125%
Base Rate	0.125%
Level 2 [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.125%
Level 3 [Member]
Line of Credit Facility [Line Items]
Debt Ratings	BBB/Baa2
Applicable Rate Commitment Fee	0.175%
Base Rate	0.25%
Level 3 [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.25%
Level 4 [Member]
Line of Credit Facility [Line Items]
Debt Ratings	BBB-/Baa3
Applicable Rate Commitment Fee	0.225%
Base Rate	0.50%
Level 4 [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.50%
Level 5 [Member]
Line of Credit Facility [Line Items]
Debt Ratings	BB+/Ba1
Applicable Rate Commitment Fee	0.275%
Base Rate	0.625%
Level 5 [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.625%
Level 6 [Member]
Line of Credit Facility [Line Items]
Debt Ratings	BB/Ba2 or worse
Applicable Rate Commitment Fee	0.35%
Base Rate	0.75%
Level 6 [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
EuroDollar Rate/Letter of Credit	1.75%