Change in Accounting Principle: Inventories Components of Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 239,393	$ 212,027
Work in process	12,506	13,898
Finished goods	196,436	209,972
Supplies and materials	163,007	158,394
Inventories	$ 611,342	$ 594,291