Long-Lived Assets (Tables)

3 Months Ended

Mar. 31, 2018

Long-Lived Assets

Schedule of property, plant and equipment

Property, plant and equipment consisted of the following (dollars in thousands):

	March 31,		December 31,
	2018		2017
Property, plant and equipment cost	$	1,151,184	$	1,131,271
Less accumulated depreciation		(544,097)		(522,973)
	$	607,087	$	608,298

Schedule of identifiable intangible assets

The gross carrying amount and accumulated amortization of identifiable intangible assets are as follows (dollars in thousands):

	March 31, 2018						December 31, 2017
	Gross				Net		Gross				Net
	Carrying		Accumulated		Carrying		Carrying		Accumulated		Carrying
	Value		Amortization		Value		Value		Amortization		Value
Subject to amortization:
Customer relationships	$	21,709	$	18,310	$	3,399	$	21,709	$	17,983	$	3,726
Trade name and other		320		320		—		320		320		—
		22,029		18,630		3,399		22,029		18,303		3,726
Not subject to amortization:
Brand name		27,300		—		27,300		27,300		—		27,300
		27,300		—		27,300		27,300		—		27,300
	$	49,329	$	18,630	$	30,699	$	49,329	$	18,303	$	31,026

Schedule of estimated amortization expense

Estimated amortization expense for the next five years and thereafter is as follows (dollars in thousands):

Year ended December 31,
2018 (remaining months)	$	980
2019		930
2020		574
2021		270
2022		223
Thereafter		422
	$	3,399