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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 214,032 $ 42,828
Accounts receivable, net of allowance for doubtful accounts of $2,312 and $2,323 at September 30, 2018 and December 31, 2017, respectively 648,414 580,354
Federal and state income taxes receivable   1,152
Inventory 69,412 69,167
Other 74,961 53,354
Total current assets 1,006,819 746,855
Property and equipment, net 4,080,900 4,254,730
Goodwill and intangible assets 681,365 687,072
Deposits on equipment purchases 19,058 16,351
Deferred tax assets, net 2,580 3,875
Other 29,220 49,973
Total assets 5,819,942 5,758,856
Current liabilities:    
Accounts payable 349,213 319,621
Federal and state income taxes payable 2,128  
Accrued expenses 256,355 226,629
Total current liabilities 607,696 546,250
Borrowings under revolving credit facility   268,000
Long-term debt, net of debt discount and issuance costs of $5,998 and $1,217 at September 30, 2018 and December 31, 2017, respectively 1,119,002 598,783
Deferred tax liabilities, net 324,924 350,836
Other 12,893 12,494
Total liabilities 2,064,515 1,776,363
Commitments and contingencies (see Note 9)
Stockholders' equity:    
Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued
Common stock, par value $.01; authorized 400,000,000 shares at September 30, 2018 and 300,000,000 shares at December 31, 2017 with 267,089,563 and 266,259,083 issued and 217,209,292 and 222,456,472 outstanding at September 30, 2018 and December 31, 2017, respectively 2,671 2,662
Additional paid-in capital 2,814,748 2,785,823
Retained earnings 1,963,546 2,105,897
Accumulated other comprehensive income 4,828 6,822
Treasury stock, at cost, 49,880,271 and 43,802,611 shares at September 30, 2018 and December 31, 2017, respectively (1,030,366) (918,711)
Total stockholders' equity 3,755,427 3,982,493
Total liabilities and stockholders' equity $ 5,819,942 $ 5,758,856