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Level 4 Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Land $ 37,345 $ 35,662
Buildings 101,150 88,129
Improvements 38,183 34,526
Office equipment and vehicles 88,816 80,857
Machinery and equipment 342,466 264,084
Construction in progress 17,719 11,176
Property, plant and equipment, gross 625,679 514,434
Less accumulated depreciation (270,588) (248,510)
Property and equipment, net $ 355,091 $ 265,924