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11. Derivative Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Prepiad Expenses and Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets (liabilities), at fair value, net $ 2,998 $ 7,230
Other Liabilities Current [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets (liabilities), at fair value, net (5,569) (5,825)
Other Liabilities Noncurrent [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets (liabilities), at fair value, net (7,289) (2,576)
Designated as Hedging Instrument [Member] | Prepiad Expenses and Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 0 2,121
Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (3,781) (789)
Designated as Hedging Instrument [Member] | Other Liabilities Noncurrent [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (7,289) (2,576)
Not Designated as Hedging Instrument [Member] | Prepiad Expenses and Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 2,998 5,109
Not Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (1,788) (5,036)
Not Designated as Hedging Instrument [Member] | Other Liabilities Noncurrent [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 0 0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value   2,121
Derivative liability, fair value (2,759)  
Gross derivative liability (asset) offset in statement of financial position 0 0
Derivative assets (liabilities), at fair value, net (2,759) 2,121
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative, Collateral, Right to Reclaim Cash 0 0
Potential net amount of derivative asset (liability) (2,759) 2,121
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepiad Expenses and Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 0 2,121
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (1,890) 0
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Noncurrent [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (869) 0
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Prepiad Expenses and Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 2,998 5,109
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (1,788) (5,036)
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities Noncurrent [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 0 0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (833) (1,467)
Gross derivative liability (asset) offset in statement of financial position 0 0
Derivative assets (liabilities), at fair value, net (833) (1,467)
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative, Collateral, Obligation to Return Cash 0 0
Potential net amount of derivative asset (liability) (833) (1,467)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Prepiad Expenses and Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 0 0
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (396) (473)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Noncurrent [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (437) (994)
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (7,478) (1,898)
Gross derivative liability (asset) offset in statement of financial position 0 0
Derivative assets (liabilities), at fair value, net (7,478) (1,898)
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative, Collateral, Obligation to Return Cash 0 0
Potential net amount of derivative asset (liability) (7,478) (1,898)
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Prepiad Expenses and Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 0 0
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Current [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value (1,495) (316)
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Liabilities Noncurrent [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ (5,983) $ (1,582)