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)

Gross derivative liability (asset) offset in statement of financial position

No definition available.

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- Definition

Potential net amount of derivative asset (liability)

+ References

No definition available.

+ Details

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959

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- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

+ Details

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- Definition

Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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- Definition

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959

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- Definition

Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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