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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2019
Other Comprehensive Income (Loss) [Abstract] |
Components of Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended June 30, 2019
​ | ​ | Gross |  | Tax effect |  | Net of tax
Interest rate swap amounts reclassified into interest expense | ​ | $ | (2,472) | ​ | $ | 655 | ​ | $ | (1,817)
Changes in fair value of interest rate swaps | ​ |  | (25,615) | ​ |  | 6,788 | ​ |  | (18,827)
Foreign currency translation adjustment | ​ |  | 43,135 | ​ |  | — | ​ |  | 43,135
​ | ​ | $ | 15,048 | ​ | $ | 7,443 | ​ | $ | 22,491
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended June 30, 2018
​ | ​ | Gross |  | Tax effect |  | Net of tax
Interest rate swap amounts reclassified into interest expense | ​ | $ | (1,273) | ​ | $ | 337 | ​ | $ | (936)
Fuel hedge amounts reclassified into cost of operations | ​ |  | (1,688) | ​ |  | 420 | ​ |  | (1,268)
Changes in fair value of interest rate swaps | ​ |  | 3,196 | ​ |  | (847) | ​ |  | 2,349
Changes in fair value of fuel hedges | ​ |  | 2,045 | ​ |  | (504) | ​ |  | 1,541
Foreign currency translation adjustment | ​ |  | (43,474) | ​ |  | — | ​ |  | (43,474)
​ | ​ | $ | (41,194) | ​ | $ | (594) | ​ | $ | (41,788)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six Months Ended June 30, 2019
​ |  | Gross |  | Tax effect |  | Net of tax
Interest rate swap amounts reclassified into interest expense | ​ | $ | (4,944) | ​ | $ | 1,310 | ​ | $ | (3,634)
Changes in fair value of interest rate swaps | ​ |  | (41,336) | ​ |  | 10,954 | ​ |  | (30,382)
Foreign currency translation adjustment | ​ |  | 85,315 | ​ |  | — | ​ |  | 85,315
​ | ​ | $ | 39,035 | ​ | $ | 12,264 | ​ | $ | 51,299
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 2018
​ |  | Gross |  | Tax effect |  | Net of tax
Interest rate swap amounts reclassified into interest expense | ​ | $ | (1,872) | ​ | $ | 496 | ​ | $ | (1,376)
Fuel hedge amounts reclassified into cost of operations | ​ |  | (2,837) | ​ |  | 706 | ​ |  | (2,131)
Changes in fair value of interest rate swaps | ​ |  | 14,965 | ​ |  | (3,965) | ​ |  | 11,000
Changes in fair value of fuel hedges | ​ |  | 2,661 | ​ |  | (657) | ​ |  | 2,004
Foreign currency translation adjustment | ​ |  | (102,804) | ​ |  | — | ​ |  | (102,804)
​ | ​ | $ | (89,887) | ​ | $ | (3,420) | ​ | $ | (93,307)
Amounts Included in Accumulated Other Comprehensive Income (Loss) | A rollforward of the amounts included in AOCIL, net of taxes, for the six months ended June 30, 2019 and 2018, is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | Foreign |  | Accumulated
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Currency | ​ | Other
​ | ​ | ​ | ​ | ​ | Interest | ​ | Translation | ​ | Comprehensive
​ | ​ | ​ | ​ | Rate Swaps | ​ | Adjustment | ​ | Income (Loss)
Balance at December 31, 2018 | ​ | ​ | ​ | ​ | $ | 8,892 | ​ | $ | (83,678) | ​ | $ | (74,786)
Amounts reclassified into earnings | ​ | ​ | ​ | ​ | ​ | (3,634) | ​ | ​ | — | ​ | ​ | (3,634)
Changes in fair value | ​ | ​ | ​ | ​ | ​ | (30,382) | ​ | ​ | — | ​ | ​ | (30,382)
Foreign currency translation adjustment | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | 85,315 | ​ | ​ | 85,315
Balance at June 30, 2019 | ​ | ​ | ​ | ​ | $ | (25,124) | ​ | $ | 1,637 | ​ | $ | (23,487)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | Foreign |  | Accumulated
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Currency | ​ | Other
​ | ​ | ​ | ​ | ​ | Interest | ​ | Translation | ​ | Comprehensive
​ | ​ | Fuel Hedges | ​ | Rate Swaps | ​ | Adjustment | ​ | Income (Loss)
Balance at December 31, 2017 | ​ | $ | 2,907 | ​ | $ | 13,951 | ​ | $ | 91,555 | ​ | $ | 108,413
Amounts reclassified into earnings | ​ |  | (2,131) | ​ |  | (1,376) | ​ |  | — | ​ |  | (3,507)
Changes in fair value | ​ |  | 2,004 | ​ |  | 11,000 | ​ |  | — | ​ |  | 13,004
Foreign currency translation adjustment | ​ |  | — | ​ |  | — | ​ |  | (102,804) | ​ |  | (102,804)
Balance at June 30, 2018 | ​ | $ | 2,780 | ​ | $ | 23,575 | ​ | $ | (11,249) | ​ | $ | 15,106

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e526-108580 + Details
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