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Nature of Operations and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) aircraft | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft leased | aircraft |  |  |  |  |  |  |  |  | 260 |  |  |  |  |
Accounts receivable | $ 64,194 |  |  |  | $ 42,731 |  |  |  | $ 64,194 | $ 42,731 |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues | 803,489 | $ 829,275 | $ 805,515 | $ 783,400 | 771,241 | $ 812,673 | $ 791,512 | $ 747,166 | 3,221,679 | 3,122,592 | [1] | $ 3,063,702 | [1] |
Salaries, wages and benefits |  |  |  |  |  |  |  |  | 1,201,518 | 1,192,067 | [1] | 1,205,459 | [1] |
Other operating expenses |  |  |  |  |  |  |  |  | 272,826 | 250,778 | [1] | 255,559 | [1] |
Total operating expenses |  |  |  |  |  |  |  |  | 2,747,399 | 2,734,393 | [1] | 3,236,386 | [1] |
Operating income | 121,502 | $ 137,925 | $ 126,678 | $ 88,175 | 92,939 | $ 112,369 | $ 106,596 | $ 76,295 | 474,280 | 388,199 | [1] | (172,684) | [1] |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term assets | 104,844 |  |  |  | 65,341 |  |  |  | 104,844 | 65,341 |  |  |  |
LIABILITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities | 66,870 |  |  |  | 58,662 |  |  |  | $ 66,870 | 58,662 |  |  |  |
Operating Leases, Number of Aircraft Leased | aircraft |  |  |  |  |  |  |  |  | 260 |  |  |  |  |
Flying agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | $ 52,700 |  |  |  | 33,900 |  |  |  | $ 52,700 | 33,900 |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 3,169,520 | 3,078,297 | [1] | 3,010,738 | [1] |
Airport customer service and other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 52,159 | 44,295 | [1] | 52,964 | [1] |
Aircraft fuel |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  | 117,657 | 85,136 | [1] | 70,701 | [1] |
Airport related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  | 109,605 | 118,374 | [1] | 122,141 | [1] |
Up-front contract reimbursements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  | $ 2,000 | 1,500 |  |  |  |
ASU 2016-02 | Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000
Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  |  |  | 650,000
ASU 2016-02 | Forecast | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000
Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000
ASU 2014-09 | Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 3,204,268 |  | 3,121,206 |  |
Salaries, wages and benefits |  |  |  |  |  |  |  |  |  | 1,196,227 |  | 1,211,380 |  |
Other operating expenses |  |  |  |  |  |  |  |  |  | 299,303 |  | 305,041 |  |
Total operating expenses |  |  |  |  |  |  |  |  |  | 2,816,069 |  | 3,293,890 |  |
Operating income |  |  |  |  |  |  |  |  |  | 388,199 |  | (172,684) |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term assets |  |  |  |  | 49,220 |  |  |  |  | 49,220 |  |  |  |
LIABILITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  | 42,541 |  |  |  |  | 42,541 |  |  |  |
ASU 2014-09 | Previously Reported | Flying agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 3,126,708 |  | 3,051,414 |  |
ASU 2014-09 | Previously Reported | Airport customer service and other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 77,560 |  | 69,792 |  |
ASU 2014-09 | Previously Reported | Aircraft fuel |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  | 162,653 |  | 122,284 |  |
ASU 2014-09 | Previously Reported | Airport related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  | 69,848 |  | 72,659 |  |
ASU 2014-09 | Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | (81,676) |  | (57,504) |  |
Salaries, wages and benefits |  |  |  |  |  |  |  |  |  | (4,160) |  | (5,921) |  |
Other operating expenses |  |  |  |  |  |  |  |  |  | (48,525) |  | (49,482) |  |
Total operating expenses |  |  |  |  |  |  |  |  |  | (81,676) |  | (57,504) |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term assets |  |  |  |  | 16,121 |  |  |  |  | 16,121 |  |  |  |
LIABILITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  | $ 16,121 |  |  |  |  | 16,121 |  |  |  |
ASU 2014-09 | Adjustments | Flying agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | (48,411) |  | (40,676) |  |
ASU 2014-09 | Adjustments | Airport customer service and other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | (33,265) |  | (16,828) |  |
ASU 2014-09 | Adjustments | Aircraft fuel |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  | (77,517) |  | (51,583) |  |
ASU 2014-09 | Adjustments | Airport related expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  | $ 48,526 |  | $ 49,482 |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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