Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 209,132	$ 154,073
Marketable securities		299,849
Accounts receivable, net of allowance for bad debts	237,621	168,620
Prepaid expenses and other current assets	66,669	163,396
Asset held for sale	1,000
Total current assets	514,422	785,938
Drilling and other property and equipment, net of accumulated depreciation	5,150,876	5,184,222
Other assets	205,736	65,534
Total assets	5,871,034	6,035,694
Current liabilities:
Accounts payable	68,760	43,933
Accrued liabilities	190,204	172,228
Taxes payable	20,242	20,685
Total current liabilities	279,206	236,846
Long-term debt	1,975,275	1,973,922
Deferred tax liability	54,119	104,380
Other liabilities	257,110	135,893
Total liabilities	2,565,710	2,451,041
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock (par value $0.01, 25,000,000 shares authorized, none issued and outstanding)
Common stock (par value $0.01, 500,000,000 shares authorized; 144,769,078 shares issued and 137,694,313 shares outstanding at September 30, 2019; 144,383,662 shares issued and 137,438,353 shares outstanding at December 31, 2018)	1,448	1,444
Additional paid-in capital	2,022,672	2,018,143
Retained earnings	1,486,971	1,769,415
Accumulated other comprehensive (loss) gain	(16)	21
Treasury stock, at cost (7,074,765 and 6,945,309 shares of common stock at September 30, 2019 and December 31, 2018, respectively)	(205,751)	(204,370)
Total stockholders’ equity	3,305,324	3,584,653
Total liabilities and stockholders’ equity	$ 5,871,034	$ 6,035,694