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Level 4 Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property and Equipement [Abstract]    
Land $ 37,160 $ 37,345
Buildings 92,800 91,594
Improvements 41,594 41,372
Office equipment and vehicles 82,386 80,340
Machinery and equipment 383,740 380,456
Construction in progress 11,424 10,063
Property, plant and equipment, gross 649,104 641,170
Less accumulated depreciation (291,197) (280,185)
Property and equipment, net $ 357,907 $ 360,985