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Summary of Significant Accounting Policies (Additional Disclosures) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 Filinggroup | Dec. 31, 2015 USD ($) Filinggroup | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Accounting Policies [Line Items] |  |  |  |
Lost-in-hole revenue | $ |  | $ 3.8 | $ 4.7 | $ 5.9
Number of U.S. tax return filing groups |  | 2 |  |
Forecast [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of U.S. tax return filing groups | 1 |  |  |

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- Details
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