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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 164,829 $ 245,029
Accounts receivable, net of allowance for doubtful accounts of $4,648 and $2,312 at September 30, 2019 and December 31, 2018, respectively 411,145 558,817
Federal and state income taxes receivable 5,991 4,110
Inventory 37,334 65,579
Other 58,261 76,662
Total current assets 677,560 950,197
Property and equipment, net 3,433,495 4,002,549
Right of use asset 23,613  
Goodwill and intangible assets 449,308 477,640
Deposits on equipment purchases 7,253 12,040
Other 17,864 27,440
Total assets 4,609,093 5,469,866
Current liabilities:    
Accounts payable 208,801 288,962
Federal and state income taxes payable 535 1,408
Accrued liabilities 220,638 235,946
Lease liability 8,884  
Total current liabilities 438,858 526,316
Long-term lease liability 20,395  
Long-term debt, net of debt discount and issuance costs of $5,091 and $5,795 at September 30, 2019 and December 31, 2018, respectively 969,909 1,119,205
Deferred tax liabilities, net 226,663 306,161
Other 10,282 12,761
Total liabilities 1,666,107 1,964,443
Commitments and contingencies (see Note 10)
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 with 269,223,800 and 267,315,526 issued and 194,514,730 and 213,614,430 outstanding at September 30, 2019 and December 31, 2018, respectively 2,692 2,673
Additional paid-in capital 2,866,412 2,827,154
Retained earnings 1,388,691 1,753,557
Accumulated other comprehensive income 5,133 2,487
Treasury stock, at cost, 74,709,070 and 53,701,096 shares at September 30, 2019 and December 31, 2018, respectively (1,319,942) (1,080,448)
Total stockholders' equity 2,942,986 3,505,423
Total liabilities and stockholders' equity $ 4,609,093 $ 5,469,866