XML 46 R34.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Accumulated Other Comprehensive Loss (AOCL) (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Additional financial information disclosures [Abstract] |
Components of Accumulated Other Comprehensive Loss |
Components of AOCL | 2016 | 2015
Defined benefit plan liabilities | $ | (125,917 | ) | $ | (121,910 | )
Gain (loss) on financial instruments | 2,860 |  | (1,435 | )
Other comprehensive loss before income tax effect | (123,057 | ) | (123,345 | )
Income tax effect (1) | 9,164 |  | 10,695 |
Accumulated other comprehensive loss | $ | (113,893 | ) | $ | (112,650 | )
(1) | The allocation of the income tax effect to the components of other comprehensive income is as follows:
| 2016 | 2015
Defined benefit plan liabilities | $ | 9,736 |  | $ | 11,243 |
Gain (loss) on financial instruments | (572 | ) | (548 | )
The following table summarizes the changes in the accumulated balances for each component of AOCL:
| Defined benefit plan and other postretirement liabilities | Equity in investee other comprehensive income | Gain (loss) on financial instruments | Total, net of tax
Balance, December 31, 2013 | (77,921 | ) | (12,232 | ) | (1,679 | ) | (91,832 | )
Other comprehensive income (loss) before reclassifications | (42,926 | ) | (419 | ) | — |  | (43,345 | )
Net amount reclassified to net income | 4,995 |  | — |  | (151 | ) | 4,844 |
Elimination of equity in investee resulting from acquisition | — |  | 12,651 |  | — |  | 12,651 |
Balance, December 31, 2014 | (115,852 | ) | — |  | (1,830 | ) | (117,682 | )
Other comprehensive income before reclassifications | 7,311 |  | — |  | — |  | 7,311 |
Net amount reclassified to net loss | (2,126 | ) | — |  | (153 | ) | (2,279 | )
Balance, December 31, 2015 | $ | (110,667 | ) | $ | — |  | $ | (1,983 | ) | $ | (112,650 | )
Other comprehensive income before reclassifications | $ | (9,521 | ) | $ | — |  | $ | — |  | $ | (9,521 | )
Net amount reclassified to net loss | 4,007 |  | — |  | 4,271 |  | 8,278 |
Balance, December 31, 2016 | $ | (116,181 | ) | $ | — |  | $ | 2,288 |  | $ | (113,893 | )
Reclassification out of AOCI | Reclassifications out of AOCL were included in the consolidated statements of operations as follows:
|  | Gains (Losses) Reclassified from AOCL to the Consolidated Statements of Operations
AOCL Components | Location | 2016 | 2015 | 2014
Defined benefit plan and other postretirement liabilities | Cost of goods sold | $ | 3,464 |  | $ | (1,696 | ) | $ | 6,237 |
| Selling, general and administrative expenses | 465 |  | 235 |  | 569 |
| Other operating expense, net | 1,585 |  | 904 |  | — |
| Income tax expense | (1,507 | ) | (1,569 | ) | (1,811 | )
| Net of tax | $ | 4,007 |  | $ | (2,126 | ) | $ | 4,995 |
Equity in investee other comprehensive income | Cost of goods sold | $ | — |  | $ | — |  | $ | — |
| Income tax expense | — |  | — |  | (419 | )
| Net of tax | $ | — |  | $ | — |  | $ | (419 | )
Gain (loss) on financial instruments | Cost of goods sold | $ | (185 | ) | $ | (186 | ) | $ | (185 | )
| Helguvik impairment | 4,480 |  | — |  | — |
| Income tax benefit | (24 | ) | 33 |  | 34 |
| Net of tax | $ | 4,271 |  | $ | (153 | ) | $ | (151 | )

X
- Definition Additional financial information disclosures + References No definition available. + Details
Name: | cenx_AdditionalfinancialinformationdisclosuresAbstract
Namespace Prefix: | cenx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration