v3.8.0.1

Counterparty Risk (Cash and Cash Equivalents) (Details) | Sep. 30, 2017 | Dec. 31, 2016
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Bank of New York Mellon Corporation [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage, cash and cash equivalents | 45.00% | 27.00%
Goldman Sachs Financial Square Funds - Government Fund [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage, cash and cash equivalents | 36.00% | 16.00%
BlackRock Liquidity Funds FedFund Portfolio, Institutional Class Shares [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage, cash and cash equivalents | 18.00% | 41.00%
US Bank N.A. [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage, cash and cash equivalents | 1.00% | 0.00%
Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage, cash and cash equivalents | 0.00% | 16.00%

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