Long-Term Debt and Credit Arrangements (Capital Lease Obligations) (Details) - Capital Lease Obligations [Member]	3 Months Ended
	Mar. 31, 2018 yr Rate
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage | Rate	3.55%
Term of Capital Lease Obligation (in months) | yr	3
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage | Rate	7.37%
Term of Capital Lease Obligation (in months) | yr	7