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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
Dec. 31, 2011
Property and Equipement [Abstract]      
Land $ 34,992 $ 35,662 $ 35,469
Buildings 88,818 88,129 84,510
Improvements 34,731 34,526 32,645
Office equipment and vehicles 85,954 80,857 74,349
Machinery and equipment 271,166 264,084 253,933
Construction in progress 9,928 11,176 5,812
Property and equipment, gross 525,589 514,434 486,718
Less accumulated depreciation (264,280) (248,510) (220,262)
Property and equipment, net $ 261,309 $ 265,924 $ 266,456