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Fair Value Measurements (Details) (USD $)
Mar. 31, 2012
Netting and Collateral
Dec. 31, 2011
Netting and Collateral
Mar. 31, 2012
Fair value measured on recurring basis
Level 1
Dec. 31, 2011
Fair value measured on recurring basis
Level 1
Mar. 31, 2012
Fair value measured on recurring basis
Level 1
Commodity contracts
Dec. 31, 2011
Fair value measured on recurring basis
Level 1
Commodity contracts
Mar. 31, 2012
Fair value measured on recurring basis
Level 2
Dec. 31, 2011
Fair value measured on recurring basis
Level 2
Mar. 31, 2012
Fair value measured on recurring basis
Level 2
Commodity contracts
Dec. 31, 2011
Fair value measured on recurring basis
Level 2
Commodity contracts
Mar. 31, 2012
Fair value measured on recurring basis
Level 2
Foreign currency contracts
Dec. 31, 2011
Fair value measured on recurring basis
Level 2
Foreign currency contracts
Apr. 27, 2012
Fair value measured on recurring basis
Level 2
Hedged item inventories
Dec. 31, 2011
Fair value measured on recurring basis
Level 2
Hedged item inventories
Mar. 31, 2012
Fair value measured on recurring basis
Level 2
Hedged item commitments
Dec. 31, 2011
Fair value measured on recurring basis
Level 2
Hedged item commitments
Mar. 31, 2012
Fair value measured on recurring basis
Level 3
Dec. 31, 2011
Fair value measured on recurring basis
Level 3
Mar. 31, 2012
Fair value measured on recurring basis
Level 3
Earn-out
Dec. 31, 2011
Fair value measured on recurring basis
Level 3
Earn-out
Mar. 31, 2012
Fair value measured on recurring basis
Sub-Total
Dec. 31, 2011
Fair value measured on recurring basis
Sub-Total
Mar. 31, 2012
Fair value measured on recurring basis
Sub-Total
Commodity contracts
Dec. 31, 2011
Fair value measured on recurring basis
Sub-Total
Commodity contracts
Mar. 31, 2012
Fair value measured on recurring basis
Sub-Total
Foreign currency contracts
Dec. 31, 2011
Fair value measured on recurring basis
Sub-Total
Foreign currency contracts
Apr. 27, 2012
Fair value measured on recurring basis
Sub-Total
Hedged item inventories
Dec. 31, 2011
Fair value measured on recurring basis
Sub-Total
Hedged item inventories
Mar. 31, 2012
Fair value measured on recurring basis
Sub-Total
Hedged item commitments
Dec. 31, 2011
Fair value measured on recurring basis
Sub-Total
Hedged item commitments
Mar. 31, 2012
Fair value measured on recurring basis
Sub-Total
Earn-out
Dec. 31, 2011
Fair value measured on recurring basis
Sub-Total
Earn-out
Mar. 31, 2012
Fair value measured on recurring basis
Netting and Collateral
Dec. 31, 2011
Fair value measured on recurring basis
Netting and Collateral
Mar. 31, 2012
Fair value measured on recurring basis
Netting and Collateral
Commodity contracts
Dec. 31, 2011
Fair value measured on recurring basis
Netting and Collateral
Commodity contracts
Mar. 31, 2012
Fair value measured on recurring basis
Netting and Collateral
Foreign currency contracts
Dec. 31, 2011
Fair value measured on recurring basis
Netting and Collateral
Foreign currency contracts
Mar. 31, 2012
Fair value measured on recurring basis
Netting and Collateral
Hedged item commitments
Mar. 31, 2012
Fair value measured on recurring basis
Total
Dec. 31, 2011
Fair value measured on recurring basis
Total
Mar. 31, 2012
Fair value measured on recurring basis
Total
Commodity contracts
Dec. 31, 2011
Fair value measured on recurring basis
Total
Commodity contracts
Mar. 31, 2012
Fair value measured on recurring basis
Total
Foreign currency contracts
Dec. 31, 2011
Fair value measured on recurring basis
Total
Foreign currency contracts
Apr. 27, 2012
Fair value measured on recurring basis
Total
Hedged item inventories
Dec. 31, 2011
Fair value measured on recurring basis
Total
Hedged item inventories
Mar. 31, 2012
Fair value measured on recurring basis
Total
Hedged item commitments
Dec. 31, 2011
Fair value measured on recurring basis
Total
Hedged item commitments
Mar. 31, 2012
Fair value measured on recurring basis
Total
Earn-out
Dec. 31, 2011
Fair value measured on recurring basis
Total
Earn-out
Assets:                                                                                                      
Notes receivable             $ 7,000,000 $ 6,800,000                                                                                      
Total assets     33,122,000 14,038,000 33,122,000 14,038,000 135,287,000 57,449,000 133,574,000 51,033,000 1,270,000 2,994,000   3,216,000 443,000 206,000         168,409,000 71,487,000 166,696,000 65,071,000 1,270,000 2,994,000   3,216,000 443,000 206,000     (129,261,000) (44,168,000) (128,148,000) (43,275,000) (1,086,000) (893,000) (27,000) 39,148,000 27,319,000 38,548,000 21,796,000 184,000 2,101,000   3,216,000 416,000 206,000    
Liabilities:                                                                                                      
Debt under Term Loan Facility             250,000,000 250,000,000                                                                                      
All other debt                                 35,700,000 37,100,000                                                                  
Total liabilities     25,534,000 10,148,000 25,534,000 10,148,000 123,205,000 47,796,000 120,216,000 46,754,000 2,394,000 1,018,000 438,000 24,000 157,000   4,323,000 4,194,000 4,323,000 4,194,000 153,062,000 62,138,000 145,750,000 56,902,000 2,394,000 1,018,000 438,000 24,000 157,000   4,323,000 4,194,000 (104,978,000) (44,184,000) (103,865,000) (43,291,000) (1,086,000) (893,000) (27,000) 48,084,000 17,954,000 41,885,000 13,611,000 1,308,000 125,000 438,000 24,000 130,000   4,323,000 4,194,000
Fair value measurement, additional disclosure                                                                                                      
Amount recognized for the obligation to return cash collateral 24,700,000 1,000,000                                                                                                  
Amount recognized for the right to reclaim cash collateral $ 400,000 $ 800,000