Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Derivative Positions (Details)	Dec. 31, 2014 lb
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	28,855,000
Derivative Instruments Designated as Cash Flow Hedges [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	24,788,000
Derivative Instruments Not Designated as Accounting Hedges [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	4,067,000