Derivative Instruments (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments (Textuals) [Abstract]
Loss (gain) on derivatives, net	$ (1,495,000)	$ 4,470,000	$ (1,825,000)
Interest Rate Swap [Member]
Impact of derivative instruments on the statement of operations and OCI
Gain (loss) on interest rate swap recognized in OCI (effective portion)	(15,000)	(16,000)	3,200,000
Gain (loss) on interest rate swaps recognized in income	0	0	(96,000)
Foreign Exchange Contract [Member]
Impact of derivative instruments on the statement of operations and OCI
Gain (loss) on forward exchange contracts recognized	103,140,000	(28,244,000)	(5,134,000)
Gain on Release of cumulative translation adjustment related to net investment hedge of an equity investment	528,000	0	0
Foreign Exchange Contract [Member] \| Cash Flow Hedging [Member]
Derivative Instruments (Textuals) [Abstract]
Loss (gain) on derivatives, net		(4,470,000)	1,921,000
Realized Loss [Member] \| Foreign Exchange Contract [Member]
Impact of derivative instruments on the statement of operations and OCI
Gain (loss) on forward exchange contracts recognized	1,495,000
Interest Expense [Member] \| Interest Rate Swap [Member]
Impact of derivative instruments on the statement of operations and OCI
Gain (loss) on interest rate swaps reclassified from AOCI into income (effective portion)	$ (1,799,000)	$ (1,914,000)	$ (1,596,000)

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- Definition

Amount of gain, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity, attributable to parent entity.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

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-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

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-SubTopic 25

-Section 50

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