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Accumulated Other Comprehensive Income (Loss) (Tables)
9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss)  
Schedule of changes in Accumulated Other Comprehensive Income (Loss) (AOCI) by component, net of tax
Nine Months Ended
September 30,
20182017
Beginning balance, January 1,$13,807$21,884
Amounts reclassified from accumulated
other comprehensive income (loss)(18,298)(5,462)
Postretirement medical plan change24,659
Tax expense (benefit)(5,466)
Net current period other comprehensive income (loss)895(5,462)
Ending balance, September 30,$14,702$16,422
Summary of reclassifications out of AOCI
Three Months EndedNine Months Ended
September 30,September 30,
2018201720182017
Postretirement Medical Plan (1)
Amortization of prior service costs (credits), before tax(2)$(612)$(1,821)$(4,287)$(5,462)
Postretirement medical plan termination (19,477)(19,477)
Total before tax(20,089)(1,821)(23,764)(5,462)
Tax expense (benefit)4,6205,466
Amounts reclassified from AOCI$(15,469)$(1,821)$(18,298)$(5,462)

(1) See Note 15 for the components of our net periodic postretirement benefit costs.

(2) Presented on the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss). The balances disclosed for the three and nine months ended September 30, 2017 were previously included in Cost of product sold and Selling, general, and administrative expenses, respectively. See Note 2 for information regarding ASU 2017-07, which we adopted on January 1, 2018.