Long-Term Debt and Credit Agreements - Schedule of debt ratios (Details) (Unsecured Senior Notes [Member])	Dec. 31, 2012
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Coverage Ratio, Actual	11.46
Debt Instrument, Covenant, Interest Coverage Ratio Required, Minimum	2.25
Debt Instrument, Covenant, Leverage Ratio Required, Minimum	3.25
Debt Instrument, Leverage Ratio, Actual	1.14

Debt Instrument, Covenant, Interest Coverage Ratio Required, Minimum

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