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Summary of Significant Accounting Policies Components of Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Inventory [Line Items]    
Raw materials $ 212,027 $ 125,909
Work in process 13,898 8,287
Finished goods 209,972 78,788
Supplies and materials 158,394 119,284
Inventories at FIFO or average cost 594,291 332,268
Excess of FIFO or average cost over LIFO cost (71,768) (63,501)
Inventories $ 522,523 $ 268,767