CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 373,963	$ 371,301
Accounts receivable, net of allowance for credit losses of $1,673 and $1,921, respectively	43,751	44,185
Prepaid expenses and other current assets	36,841	40,851
Total current assets	454,555	456,337
Property and equipment, net	435,996	430,335
Right-of-use leased assets	105,072	99,666
Deposits and other assets	15,124	14,139
Total assets	1,010,747	1,000,477
Current liabilities:
Accounts payable	14,601	9,775
Accrued and other current liabilities	48,014	51,029
Installment payment agreement, current portion, net of discounts of $41 and $136, respectively	3,324	6,786
Current maturities, operating lease liabilities	11,783	11,151
Current maturities, finance lease obligations	16,004	15,702
Total current liabilities	93,726	94,443
Operating lease liabilities, net of current maturities	115,949	111,318
Finance lease obligations, net of current maturities	208,588	203,438
Other long term liabilities	19,346	14,792
Total liabilities	1,346,888	1,293,643
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value; 75,000,000 shares authorized; 47,655,131 and 47,522,672 shares issued and outstanding, respectively	48	47
Additional paid-in capital	533,049	515,867
Accumulated other comprehensive income - foreign currency translation	(4,740)	(1,306)
Accumulated deficit	(864,498)	(807,774)
Total stockholders' deficit	(336,141)	(293,166)
Total liabilities and stockholders' equity	1,010,747	1,000,477
2021 Notes
Current liabilities:
Senior secured notes		444,492
Senior unsecured 2024 Notes
Current liabilities:
Senior unsecured Notes	412,254	$ 425,160
Senior secured 2026 Notes
Current liabilities:
Senior secured notes	$ 497,025