Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 237,549	$ 291,320
Restricted cash	71,282
Accounts receivable, net of allowance for credit losses of $1,410 and $3,469, respectively	136,704	132,233
Other current assets	62,442	102,092
Total current assets	507,977	525,645
Property and equipment	2,942,699	2,948,907
Less accumulated depreciation	(1,256,025)	(1,165,943)
Property and equipment, net	1,686,674	1,782,964
Operating lease right-of-use assets	117,397	149,656
Other assets, net	35,251	40,013
Total assets	2,347,299	2,498,278
Current liabilities:
Accounts payable	75,162	50,022
Accrued liabilities	85,240	87,035
Current maturities of long-term debt	42,825	90,651
Current operating lease liabilities	55,051	51,599
Total current liabilities	258,278	279,307
Long-term debt	261,668	258,912
Operating lease liabilities	64,423	101,009
Deferred tax liabilities	91,785	110,821
Other non-current liabilities	1,481	3,878
Total liabilities	677,635	753,927
Commitments and contingencies
Redeemable noncontrolling interests		3,855
Shareholders' equity:
Common stock, no par, 240,000 shares authorized, 150,876 and 150,341 shares issued, respectively	1,290,697	1,327,592
Retained earnings	437,065	464,524
Accumulated other comprehensive loss	(58,098)	(51,620)
Total shareholders' equity	1,669,664	1,740,496
Total liabilities, redeemable noncontrolling interests and shareholders' equity	$ 2,347,299	$ 2,498,278