SUMMARY OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of Estimated Useful Lives of Property, Plant, and Equipment
Depreciation and amortization are computed using the straight-line method for all assets over the assets’ estimated useful lives.  Estimated useful lives are as follows:
 
 
Years
Building
 
20 - 40
Machinery and equipment
 
10 - 20
Furniture and office equipment
 
3 - 10
Computer hardware and software
 
3 - 6
Leasehold improvements
 
Over the shorter of the lease term or the useful life of the improvements
Asset Retirement Obligations Included in Other Liabilities
The following table presents an analysis related to our asset retirement obligations included in Other liabilities and Accrued liabilities in the accompanying consolidated balance sheets:
 
Year Ended December 31,
(Dollars in thousands)
2014
 
2013
Asset retirement obligations, January 1
$
13,194

 
$
11,854

Adjustment to existing liabilities
(3,733
)
 
(190
)
Liabilities related to assets held for sale
(1,914
)
 
—

Accretion expense
683

 
887

Settlement of existing liabilities
(262
)
 
(903
)
Liabilities incurred
—

 
1,546

Asset retirement obligations
7,968

 
13,194

Less: Current portion
(453
)
 
(486
)
Non-current portion of asset retirement obligations, December 31
$
7,515

 
$
12,708
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in Accumulated other comprehensive income (loss) by balance type for the years ended December 31, 2014 and 2013:

(Dollars in thousands)
Losses on Derivative Financial Instruments
 
Defined Benefit Pension Items
 
Total
Accumulated other comprehensive loss as of December 31, 2012
$
(335
)
 
$
(24,938
)
 
$
(25,273
)
Amounts reclassified from Accumulated other comprehensive income to Cost of products sold
335

 
2,282

 
2,617

Pension liability adjustment
—

 
11,221

 
11,221

Net decrease in other comprehensive loss
335

 
13,503

 
13,838

Accumulated other comprehensive loss as of December 31, 2013
—

 
(11,435
)
 
(11,435
)
Amounts reclassified from Accumulated other comprehensive income to Cost of products sold
—

 
1,363

 
1,363

Pension liability adjustment
—

 
(17,045
)
 
(17,045
)
Net decrease in other comprehensive loss
—

 
(15,682
)
 
(15,682
)
Accumulated other comprehensive loss as of December 31, 2014
$
—

 
$
(27,117
)
 
$
(27,117
)