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Summary of Significant Accounting Policies (Income Taxes) (Details) - filing_group | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Accounting Policies [Abstract] |  |
Number of U.S. tax return filing groups | 1 | 2

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- Definition Number of federal income tax return filing groups. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration