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Summary of Significant Accounting Policies Level 4 Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Property and Equipement [Abstract]    
Land $ 34,992 $ 35,662
Buildings 88,818 88,129
Improvements 34,731 34,526
Office equipment and vehicles 85,954 80,857
Machinery and equipment 271,166 264,084
Construction in progress 9,928 11,176
Property, plant and equipment, gross 525,589 514,434
Less accumulated depreciation (264,280) (248,510)
Property and equipment, net $ 261,309 $ 265,924