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Basis of Presentation Narrative (Details) - USD ($) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification of stranded tax effects | [1] |  | $ 0 |
Decrease in net cash flows used in investing activities |  |  | 217,199 | $ 656,240
Increase in net cash provided by operating activities |  |  | $ 134,834 | 87,689
Accounting Standards Update 2018-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification of stranded tax effects |  | $ 7,100 |  |
Restatement Adjustment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease in net cash flows used in investing activities |  |  |  | 12,700
Increase in net cash provided by operating activities |  |  |  | $ 12,700
[1] | Result of adoption of ASU 2018-02, See Note 1 to Consolidated Financial Statements for further details.

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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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