Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Inventory (Narrative) (Details)	Dec. 31, 2014	Dec. 31, 2013
Inventory Policy [Abstract]
Percentage of FIFO Inventory	50.00%us-gaap_PercentageOfFIFOInventory	50.00%us-gaap_PercentageOfFIFOInventory
Percentage of LIFO Inventory	25.00%us-gaap_PercentageOfLIFOInventory	25.00%us-gaap_PercentageOfLIFOInventory
Percentage of average cost inventory	25.00%	25.00%

The percentage of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

No definition available.

Name:	us-gaap_PercentageOfWeightedAverageCostInventory
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant