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Basis of Presentation and Organization Recent Accounting Pronouncements (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Cash Flow Increase [Member] |  |  |
Item Effected [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 6,227,000 | $ 5,538,000 |
Income Tax Benefit [Member] |  |  |
Item Effected [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 6,082,000 | $ 5,499,000 | $ 7,925,000
Weighted Average Diluted Shares Outstanding Impact [Member] |  |  |
Item Effected [Line Items] |  |  |
Adoption of Recent Accounting Pronouncement Impact on Weighted Average Shares Outstanding | 159,387 | 240,016 |

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