Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 156,281	$ 154,073
Marketable securities		299,849
Accounts receivable, net of allowance for bad debts	250,856	168,620
Prepaid expenses and other current assets	68,658	163,396
Asset held for sale	1,000
Total current assets	476,795	785,938
Drilling and other property and equipment, net of accumulated depreciation	5,152,828	5,184,222
Other assets	204,421	65,534
Total assets	5,834,044	6,035,694
Current liabilities:
Accounts payable	68,586	43,933
Accrued liabilities	210,780	172,228
Taxes payable	23,228	20,685
Total current liabilities	302,594	236,846
Long-term debt	1,975,741	1,973,922
Deferred tax liability	47,528	104,380
Other liabilities	275,971	135,893
Total liabilities	2,601,834	2,451,041
Commitments and contingencies (Note 10)
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; 144,781,766 shares issued and 137,703,910 shares outstanding at December 31, 2019; 144,383,662 shares issued and 137,438,353 shares outstanding at December 31, 2018)	1,448	1,444
Additional paid-in capital	2,024,347	2,018,143
Retained earnings	1,412,201	1,769,415
Accumulated other comprehensive (loss) gain	(18)	21
Treasury stock, at cost (7,077,856 and 6,945,309 shares of common stock at December 31, 2019 and 2018, respectively)	(205,768)	(204,370)
Total stockholders’ equity	3,232,210	3,584,653
Total liabilities and stockholders’ equity	$ 5,834,044	$ 6,035,694