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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Cross Currency Swap Agreement | As at December 31, 2012, the Partnership was committed to the following cross currency swap:
Principal |  |  | Principal |  |  | Floating Rate Receivable |  |  | Fixed |  |  | Fair Value / Carrying Amount of |  |  | Weighted- Average Remaining |
Amount NOK |  |  | Amount $ |  |  | Reference Rate |  |  | Margin |  |  | Rate Payable |  |  | Liability $ |  |  | Term (Years) |
| 700,000 |  |  |  | 125,000 |  |  |  | NIBOR |  |  |  | 5.25 | % |  |  | 6.88 | % |  |  | (2,623 | ) |  |  | 4.3 |
Interest Rate Swap Agreements | As at December 31, 2012, the Partnership was committed to the following interest rate swap agreements:
|  | Interest Rate Index |  | Principal Amount $ |  |  | Fair Value / Carrying Amount of Assets (Liability) $ |  |  | Weighted- Average Remaining Term (years) |  |  | Fixed Interest Rate (%)(1) |
LIBOR-Based Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Dollar-denominated interest rate swaps(2) |  | LIBOR |  |  | 412,880 |  |  |  | (110,590 | ) |  |  | 24.1 |  |  |  | 4.9 |
U.S. Dollar-denominated interest rate swaps(2) |  | LIBOR |  |  | 203,455 |  |  |  | (57,804 | ) |  |  | 6.2 |  |  |  | 6.2 |
U.S. Dollar-denominated interest rate swaps |  | LIBOR |  |  | 90,000 |  |  |  | (17,937 | ) |  |  | 5.7 |  |  |  | 4.9 |
U.S. Dollar-denominated interest rate swaps |  | LIBOR |  |  | 100,000 |  |  |  | (20,205 | ) |  |  | 4.0 |  |  |  | 5.3 |
U.S. Dollar-denominated interest rate swaps(3) |  | LIBOR |  |  | 206,250 |  |  |  | (56,355 | ) |  |  | 16.0 |  |  |  | 5.2 |
LIBOR-Based Restricted Cash Deposit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Dollar-denominated interest rate swaps(2) |  | LIBOR |  |  | 469,260 |  |  |  | 165,687 |  |  |  | 24.1 |  |  |  | 4.8 |
EURIBOR-Based Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro-denominated interest rate swaps(4) |  | EURIBOR |  |  | 341,382 |  |  |  | (41,329 | ) |  |  | 11.5 |  |  |  | 3.1 |
|  |  |  |  |  |  |  |  | (138,533 | ) |  |  |  |  |  |  |  |
(1) | Excludes the margins the Partnership pays on its floating-rate term loans, which, at December 31, 2012, ranged from 0.30% to 2.75%.
(2) | Principal amount reduces quarterly.
(3) | Principal amount reduces semi-annually.
(4) | Principal amount reduces monthly to 70.1 million Euros ($92.5 million) by the maturity dates of the swap agreements.
Location and Fair Value Amounts of Derivative Instruments | The following table presents the location and fair value amounts of derivative instruments, segregated by type of contract, on the Partnership’s consolidated balance sheets.
|  | Accounts receivable |  |  | Current portion of derivative assets |  |  | Derivative assets |  |  | Accrued liabilities |  |  | Current portion of derivative liabilities |  |  | Derivative liabilities |
As at December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreements |  |  | 4,513 |  |  |  | 16,927 |  |  |  | 144,247 |  |  |  | (10,887 | ) |  |  | (48,046 | ) |  |  | (245,287 | )
Cross currency swap agreement |  |  | 54 |  |  |  | 285 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,962 | )
Toledo Spirit time-charter derivative |  |  | — |  |  |  | — |  |  |  | 1,100 |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | 4,567 |  |  |  | 17,212 |  |  |  | 145,347 |  |  |  | (10,887 | ) |  |  | (48,046 | ) |  |  | (248,249 | )
As at December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreements |  |  | 4,344 |  |  |  | 15,608 |  |  |  | 139,651 |  |  |  | (11,448 | ) |  |  | (43,973 | ) |  |  | (248,645 | )
Toledo Spirit time-charter derivative |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (600 | )
|  |  | 4,344 |  |  |  | 15,608 |  |  |  | 139,651 |  |  |  | (11,448 | ) |  |  | (43,973 | ) |  |  | (249,245 | )
Gains (Losses) for Derivative Instruments Not Designated or Qualifying as Hedging Instruments | The effect of the (loss) gain on these derivatives on the Partnership’s consolidated statements of income is as follows:
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Realized gains (losses) |  |  | Unrealized gains (losses) |  |  | Total |  |  | Realized gains (losses) |  |  | Unrealized gains (losses) |  |  | Total |  |  | Realized gains (losses) |  |  | Unrealized gains (losses) |  |  | Total |
Interest rate swap agreements |  |  | (37,427 | ) |  |  | 5,200 |  |  |  | (32,227 | ) |  |  | (62,660 | ) |  |  | (9,677 | ) |  |  | (72,337 | ) |  |  | (42,495 | ) |  |  | (34,906 | ) |  |  | (77,401 | )
Toledo Spirit time-charter derivative |  |  | 907 |  |  |  | 1,700 |  |  |  | 2,607 |  |  |  | (93 | ) |  |  | 9,400 |  |  |  | 9,307 |  |  |  | (1,919 | ) |  |  | 600 |  |  |  | (1,319 | )
|  |  | (36,520 | ) |  |  | 6,900 |  |  |  | (29,620 | ) |  |  | (62,753 | ) |  |  | (277 | ) |  |  | (63,030 | ) |  |  | (44,414 | ) |  |  | (34,306 | ) |  |  | (78,720 | )

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these 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 -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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