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