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Other Comprehensive Income (Loss) | 6 Months Ended
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Jun. 30, 2019
Other Comprehensive Income (Loss) [Abstract] |
Other Comprehensive Income (Loss) | 16.OTHER COMPREHENSIVE INCOME (LOSS) Other comprehensive income (loss) includes changes in the fair value of interest rate swaps and fuel hedges that qualify for hedge accounting. The components of other comprehensive income (loss) and related tax effects for the three and six months ended June 30, 2019 and 2018 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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)
​ 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
​ See Note 12 for further discussion on the Company’s derivative instruments.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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