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Summary of Significant Accounting Policies, Part 2 (Details) | 12 Months Ended
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Dec. 31, 2017
Current Assets and Current Liabilities [Abstract] |
Threshold for components of total current assets and current liabilities to be presented as an individual caption on Consolidated Balance Sheet | 5.00%
Minimum [Member] |
Derivative Instruments [Abstract] |
Expected offset percentage of change in fair value derivative instrument | 80.00%
Maximum [Member] |
Derivative Instruments [Abstract] |
Expected offset percentage of change in fair value derivative instrument | 125.00%

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