Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 243,911	$ 291,320
Restricted cash	71,282
Accounts receivable, net of allowance for credit losses of $1,548 and $3,469, respectively	125,569	132,233
Other current assets	78,869	102,092
Total current assets	519,631	525,645
Property and equipment	2,964,068	2,948,907
Less accumulated depreciation	(1,228,891)	(1,165,943)
Property and equipment, net	1,735,177	1,782,964
Operating lease right-of-use assets	125,481	149,656
Other assets, net	37,418	40,013
Total assets	2,417,707	2,498,278
Current liabilities:
Accounts payable	70,105	50,022
Accrued liabilities	83,618	87,035
Current maturities of long-term debt	70,492	90,651
Current operating lease liabilities	50,769	51,599
Total current liabilities	274,984	279,307
Long-term debt	265,222	258,912
Operating lease liabilities	76,934	101,009
Deferred tax liabilities	97,906	110,821
Other non-current liabilities	2,601	3,878
Total liabilities	717,647	753,927
Redeemable noncontrolling interests		3,855
Shareholders' equity:
Common stock, no par, 240,000 shares authorized, 150,787 and 150,341 shares issued, respectively	1,288,603	1,327,592
Retained earnings	456,108	464,524
Accumulated other comprehensive loss	(44,651)	(51,620)
Total shareholders' equity	1,700,060	1,740,496
Total liabilities, redeemable noncontrolling interests and shareholders' equity	$ 2,417,707	$ 2,498,278