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Derivative Instruments, Hedging Activities and Fair Value (Details 5) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Fair value measurements recurring | Level 2 |  |  |
Assets |  |  |
Foreign currency forward exchange contracts | $ 3,781 |  | $ 1,256
Cross-currency interest rate swaps | 24,046 |  | 26,001
Liabilities |  |  |
Foreign currency forward exchange contracts | 2,815 |  | 3,284
Cross-currency interest rate swaps | 17,412 |  | 13,410
Unit Adjustment Liability, Infrastructure Transaction [Member] |  |  |
Fair value of financial instruments |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 103,308 | [1] | 106,343
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | (5,580) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Accretion Expense | $ 2,546 | [2] |
[1] | Does not total due to rounding.
[2] | See Note 5, Equity Method Investments, for additional information related to the unit adjustment liability.

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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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