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Level 4 Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Property and Equipement [Abstract]    
Land $ 37,160 $ 37,345
Buildings 93,145 91,594
Improvements 41,158 41,372
Office equipment and vehicles 84,529 80,340
Machinery and equipment 387,287 380,456
Construction in progress 12,377 10,063
Property, plant and equipment, gross 655,656 641,170
Less accumulated depreciation (300,298) (280,185)
Property and equipment, net $ 355,358 $ 360,985