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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Net loss $ (130,857) $ (97,573)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:    
Depreciation and amortization 96,821 76,042
Loss on asset disposals, abandonments and write-downs 7,540 1,619
Deferred income taxes 737 630
Stock-based compensation expense 15,007 12,986
Loss of extinguishment of debt   15,406
Amortization of deferred financing costs 2,718 2,981
Accretion and amortization of debt discount and premium 13,872 12,940
Adjustment of deferred financing costs   (792)
Changes in operating assets and liabilities:    
Accounts receivable (38,130) 6,874
Inventories 1,645 (14,653)
Prepaid expenses and other current assets 4,928 (18,106)
Accounts payable (1,246) 2,174
Accrued liabilities 20,521 2,750
Deferred airborne lease incentives 11,722 8,635
Deferred revenue 11,080 19,690
Deferred rent 336 317
Accrued airline revenue share 1,169 1,525
Accrued interest (17,742) 16,025
Other non-current assets and liabilities (4,330) (4,322)
Net cash provided by (used in) operating activities (4,209) 45,148
Investing activities:    
Proceeds from the sale of property and equipment   84
Purchases of property and equipment (190,479) (107,108)
Acquisition of intangible assets-capitalized software (23,759) (21,586)
Purchases of short-term investments (213,651) (278,961)
Redemptions of short-term investments 363,632 159,727
Other, net (2,486) 136
Net cash used in investing activities (66,743) (247,708)
Financing activities:    
Proceeds from the issuance of senior secured notes 181,843 525,000
Payments on amended and restated credit agreement   (310,132)
Payment of issuance costs (3,602) (10,610)
Payments on capital leases (2,340) (1,875)
Stock-based compensation activity (429) 43
Net cash provided by financing activities 175,472 202,426
Effect of exchange rate changes on cash 556 (378)
Increase (decrease) in cash and cash equivalents 105,076 (512)
Cash and cash equivalents at beginning of period 117,302 147,342
Cash and cash equivalents at end of period 222,378 146,830
Supplemental Cash Flow Information:    
Cash paid for interest 86,359 27,535
Cash paid for taxes 35 291
Noncash Investing and Financing Activities:    
Purchases of property and equipment in current liabilities 46,817 31,062
Purchases of property and equipment paid by commercial airlines 7,987 10,993
Purchases of property and equipment under capital leases 1,174 1,531
Acquisition of intangible assets in current liabilities 1,100 1,390
Asset retirement obligation incurred and adjustments $ 778 $ (36)