2015 December 31, 2014 ASSETS Current assets: Cash and cash equivalents......... $ 119,028 $ 233,623 Marketable securities........... 11,518 16,033 Accounts receivable, net of allowance for bad debts.. 405,370 463,862 Prepaid expenses and other current assets. 119,479 185,541 Assets held for sale Total current assets.. Drilling and other property and equipment, net of accumulated depreciation....... 14,200 669,595 899,059 6,378,814 6,945,953 116,480 176,277 $ 7,164,889 $ 8,021,289 Other assets.... Total assets.. LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Accounts payable.. $ 70,272 $ 138,444 Accrued liabilities. 253,769 426,592 Taxes payable....... 15,093 41,648 Short-term borrowings. 286,589 Current portion of long-term debt. 249,962 Total current liabilities. 625,723 856,646 Long-term debt... 1,994,773 1,994,526 Deferred tax liability. Other liabilities..... Total liabilities........... 276,529 530,394 155,094 188,160 3,052,119 3,569,726 Commitments and contingencies (Note 12) 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; 143,978,877 shares issued and 137,158,706 shares outstanding at December 31, 2015; 143,960,260 shares issued and 137,147,899 shares outstanding at December 31, 2014).. 1,440 1,440 Additional paid-in capital.. 1,999,634 1,993,898 Retained earnings 2,319,136 2,661,999 Accumulated other comprehensive gain (loss) (5,035) (3,605) Treasury stock, at cost (6,820,171 and 6,812,361 shares of common stock at December 31, 2015 and 2014, respectively).. (202,405) (202,169) Total stockholders' equity 4,112,770 4,451,563 Total liabilities and stockholders' equity....... 7,164,889 $ 8,021,289