Quarterly report pursuant to Section 13 or 15(d)

General (Details)

v2.4.0.6
General (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Carrying amounts and classification of assets and liabilities    
Current assets $ 915,651 $ 887,351
Noncurrent assets 396,861 394,537
Total assets 1,312,512 1,281,888
Current liabilities 337,083 308,466
Noncurrent liabilities 78,307 80,895
Total liabilities 415,390 389,361
Variable Interest Entity, Primary Beneficiary [Member]
   
Carrying amounts and classification of assets and liabilities    
Current assets 14,067 11,287
Noncurrent assets 133,057 132,925
Total assets 147,124 144,212
Current liabilities 68,228 65,608
Noncurrent liabilities 18,276 18,297
Total liabilities $ 86,504 $ 83,905