Earnings Per Share (Computation of Basic and Diluted Earnings per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	4 Months Ended	5 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2018	Jun. 03, 2018	Sep. 30, 2019
Successor Company
Earnings Per Share, Basic [Abstract]
Undistributed net income from operations	$ 16,323		$ 17,693		$ 59,635
Basic net income attributable to common shares	$ 16,323		$ 17,693		$ 59,635
Basic weighted average shares outstanding (in shares)	20,164,876		20,009,463		20,115,868
Basic undistributed net income per share attributable to common shares (USD per share)	$ 0.81		$ 0.88		$ 2.96
Earnings Per Share, Diluted [Abstract]
Undistributed net income from operations	$ 16,323		$ 17,693		$ 59,635
Diluted net income attributable to common shares	$ 16,323		$ 17,693		$ 59,635
Basic weighted average shares outstanding (in shares)	20,164,876		20,009,463		20,115,868
Effect of dilutive options and restricted share units (in shares)	51,000		42,000		134,000
Diluted weighted average shares outstanding (in shares)	20,216,314		20,051,796		20,249,682
Diluted undistributed net income per share attributable to common shares (USD per share)	$ 0.81		$ 0.88		$ 2.95
Predecessor Company
Earnings Per Share, Basic [Abstract]
Undistributed net income from operations		$ 12,713		$ 696,156
Basic net income attributable to common shares		$ 12,713		$ 696,156
Basic weighted average shares outstanding (in shares)		20,004,736		29,338,329
Basic undistributed net income per share attributable to common shares (USD per share)		$ 0.64		$ 23.73
Earnings Per Share, Diluted [Abstract]
Undistributed net income from operations		$ 12,713		$ 696,156
Diluted net income attributable to common shares		$ 12,713		$ 696,156
Basic weighted average shares outstanding (in shares)		20,004,736		29,338,329
Effect of dilutive options and restricted share units (in shares)		65,000		0
Diluted weighted average shares outstanding (in shares)		20,069,587		29,338,329
Diluted undistributed net income per share attributable to common shares (USD per share)		$ 0.63		$ 23.73

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The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Includes the adjustments resulting from the assumption that dilutive securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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