Basis of Presentation and Significant Accounting Policies Additional Information (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
Fair Value, Option, Credit Risk, Gains (Losses) on Liabilities		$ 0
Gain (Loss) on Sale of Derivatives	$ 106	$ 199
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		-144
Operating Expense [Member] | Accounting Standards Update 2017-07 [Member]
Derivative [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description		144
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