Fair Value Measurements (Narrative) (Details) - Weighted Average [Member] - Fair Value, Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member]	Jun. 30, 2015	Dec. 31, 2014
Inventory Related Payables [Member]
Fair Value Measurements [Line Items]
Basis	33.40%	43.40%
Inventories Carried At Market [Member]
Fair Value Measurements [Line Items]
Basis	14.60%	23.40%