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1. Basis of Presentation and Use of Estimates Immaterial Errors (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Payments to Suppliers and Employees $ 898,757 $ 925,534
Net Cash Provided by (Used in) Operating Activities 67,979 142,442
Payments to Acquire Property, Plant, and Equipment 59,269 53,510
Net Cash Provided by (Used in) Investing Activities $ (55,856) (94,556)
Scenario, Adjustment [Member] | Immaterial Error [Member]    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Payments to Suppliers and Employees   (7,400)
Net Cash Provided by (Used in) Operating Activities   (7,400)
Payments to Acquire Property, Plant, and Equipment   7,400
Net Cash Provided by (Used in) Investing Activities   $ 7,400