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Nature of Operations and Basis of Presentation (Policies)
3 Months Ended
Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Use of Estimates
The preparation of the consolidated financial statements involves the use of estimates and accruals. Actual results may vary from those estimates.
Consolidation
The consolidated financial statements include the accounts of PCA and its majority-owned subsidiaries after elimination of intercompany balances and transactions.
Inventory Valuation
We value our raw materials, work in process, and finished goods inventories using lower of cost, as determined by the average cost method, or market. Supplies and materials are valued at the first-in, first-out (FIFO) or average cost methods.