Long-Term Debt and Loan Agreements - Schedule of Debt Ratios (Details) - Unsecured Senior Notes [Member]	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Coverage Ratio, Actual	8.30%
Debt Instrument, Leverage Ratio, Actual	2.88%
Debt Instrument, Covenant, Interest Coverage Ratio Required, Minimum	3.00%
Debt Instrument, Covenant, Leverage Ratio Required, Maximum	3.25%