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Basis of Presentation and Significant Accounting Policies Additional Information (Details) - Successor [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative [Line Items] |  |  |  |
Fair Value, Option, Credit Risk, Gains (Losses) on Liabilities |  | $ 0 |  | $ 0
Gain (Loss) on Sale of Derivatives | $ 91 | $ 1,134 | $ 197 | $ 1,333
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  | 2,900 |
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  | (2,900) |
Other Operating Income (Expense) [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Description |  |  |  | -397
Operating Expense [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Description |  | 253 |  | 397
Deferred Income Tax Charge [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  | (590) |
Deferred Income Tax Charge [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  | $ 590 |

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