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Summary of Significant Accounting Policies (Inventory) (Narrative) (Details) | Dec. 31, 2016 | Dec. 31, 2015
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Inventory Policy [Abstract] |  |
Percentage of FIFO Inventory | 55.00% | 55.00%
Percentage of LIFO Inventory | 15.00% | 15.00%
Percentage of average cost inventory | 30.00% | 30.00%

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- Definition Inventory Policy [Abstract] + References No definition available. + Details
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- Definition The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
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- Definition The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Definition The percentage of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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