CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 319,609	$ 371,301
Restricted cash	9,015
Accounts receivable, net of allowance for credit losses of $1,510 and $1,921, respectively	41,938	44,185
Prepaid expenses and other current assets	39,015	40,851
Total current assets	409,577	456,337
Property and equipment	1,619,515	1,515,867
Accumulated depreciation and amortization	(1,161,635)	(1,085,532)
Total property and equipment, net	457,880	430,335
Right-of-use leased assets	101,687	99,666
Deposits and other assets	15,413	14,139
Total assets	984,557	1,000,477
Current liabilities:
Accounts payable	11,923	9,775
Accrued and other current liabilities	39,057	51,029
Current maturities, operating lease liabilities	12,197	11,151
Installment payment agreement, current portion, net of discount of $6 and $136, respectively	785	6,786
Finance lease obligations, current maturities	17,048	15,702
Total current liabilities	81,010	94,443
Operating lease liabilities, net of current maturities	111,794	111,318
Finance lease obligations, net of current maturities	228,822	203,438
Other long-term liabilities	44,609	14,792
Total liabilities	1,357,655	1,293,643
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value; 75,000,000 shares authorized; 47,674,189 and 47,214,077 shares issued and outstanding, respectively	48	47
Additional paid-in capital	547,734	515,867
Accumulated other comprehensive loss	(11,003)	(1,306)
Accumulated deficit	(909,877)	(807,774)
Total stockholders' deficit	(373,098)	(293,166)
Total liabilities and stockholders' equity	984,557	1,000,477
2022 Notes
Current liabilities:
Senior secured 2022 notes, net of unamortized debt costs of $1,052 and including premium of $544		444,492
Senior unsecured 2024 Notes
Current liabilities:
Senior unsecured 2024 Euro notes, net of unamortized debt costs of $2,121 and $2,961, respectively and net of discount of $772 and $1,142, respectively	394,112	$ 425,160
Senior secured 2026 Notes
Current liabilities:
Senior unsecured 2026 notes, net of unamortized debt costs of $1,156 and discount of $1,536	$ 497,308