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Benefit Plans (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Pension Costs

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Benefit Plans

The components of our consolidated net pension costs are set forth in the following table:

​	​	​	​	​	​	​	​
			For the six months ended June 30,
​	​	​	​	​	​	​	​
		2018			2017
​	​	​	​	​	​	​	​
(Dollars in thousands)
Service cost		$	996		$	992
Interest cost			2,482			2,769
Expected return on plan assets			(3,004	)		(2,777	)
​	​	​	​	​	​	​	​
Net cost		$	474		$	984
​	​	​	​	​	​	​	​

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		Successor
		2017						2016						For the period August 15 through December 31, 2015
		U.S.			Foreign			U.S.			Foreign			U.S.			Foreign
​	​	​		​	​		​	​		​	​		​	​		​	​		​
								(Dollars in thousands)
Service cost		$	1,305		$	710		$	1,325		$	698		$	386		$	281
Interest cost		5,352			199			5,744			243			2,200			94
Expected return on assets		(5,268		)	(299		)	(4,940		)	(298		)	(1,885		)	(59		)
Curtailment gain		—			—			—			—			—			(675		)
Mark-to-market loss (gain)		(4,140		)	(53		)	(2,322		)	(220		)	716			1,843
​	​	​		​	​		​	​		​	​		​	​		​	​		​
Pension costs		$	(2,751	)	$	557		$	(193	)	$	423		$	1,417		$	1,484
​	​	​		​	​		​	​		​	​		​	​		​	​		​

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		Predecessor
		For the period January 1 through August 14, 2015
		U.S.			Foreign
​	​	​		​	​		​
Service cost		$	151		$	98
Interest cost		854			554
Amortization of prior service cost		—			(12		)
​	​	​		​	​		​
Pension costs		$	1,005		$	640
​	​	​		​	​		​

Postretirement Costs

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Benefit Plans

The components of our consolidated net postretirement costs are set forth in the following table:

​	​	​	​	​	​	​	​
For the six months ended June 30,
​	​	​	​	​	​	​	​
		2018			2017
​	​	​	​	​	​	​	​
(Dollars in thousands)
Service cost		$	—		$	1
Interest cost			502			483
​	​	​	​	​	​	​	​
Net cost		$	502		$	484
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Successor

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For the period August 15 through

2017

2016

December 31, 2015

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U.S.

Foreign

U.S.

Foreign

U.S.

Foreign

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(Dollars in thousands)

Service cost

$

—

$

2

$

—

$

4

—

$

5

Interest cost

333

653

360

764

142

289

Plan amendment / curtailment

—

—

—

(993

)

—

—

Mark-to-market (gain) loss

(1,257

)

742

(191

)

(225

)

(100

)

(621

)

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Post-employment benefits cost (benefit)

$

(924

)

$

1,397

$

169

$

(450

)

$

42

$

(327

)

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		Successor
​	​	​		​	​		​
		For the period January 1 through August 14, 2015
​	​	​		​	​		​
		U.S.			Foreign
​	​	​		​	​		​
		(Dollars in thousands)
Service cost		$	—		$	9
Interest cost		223			433
Plan amendment / curtailment		—			—
Mark-to-market (gain) loss		—			—
​	​	​		​	​		​
Post-employment benefits cost (benefit)		$	223		$	442
​	​	​		​	​		​

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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