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Summary of Significant Accounting Policies (New Accounting Pronouncements and Changes in Accounting Principle) (Details) $ in Thousands	Jan. 01, 2018 USD ($)
Accounting Standards Update 2014-09 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustment	$ 14,402

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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