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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 241,908 $ 42,828
Accounts receivable, net of allowance for doubtful accounts of $2,296 and $2,323 at June 30, 2018 and December 31, 2017, respectively 602,748 580,354
Federal and state income taxes receivable 1,169 1,152
Inventory 81,158 69,167
Other 80,975 53,354
Total current assets 1,007,958 746,855
Property and equipment, net 4,208,697 4,254,730
Goodwill and intangible assets 684,528 687,072
Deposits on equipment purchases 21,770 16,351
Deferred tax assets, net 1,857 3,875
Other 29,180 49,973
Total assets 5,953,990 5,758,856
Current liabilities:    
Accounts payable 371,518 319,621
Accrued expenses 229,851 226,629
Total current liabilities 601,369 546,250
Borrowings under revolving credit facility   268,000
Long-term debt, net of debt discount and issuance costs of $6,082 and $1,217 at June 30, 2018 and December 31, 2017, respectively 1,118,918 598,783
Deferred tax liabilities, net 340,718 350,836
Other 12,646 12,494
Total liabilities 2,073,651 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 June 30, 2018 and 300,000,000 shares at December 31, 2017 with 266,687,633 and 266,259,083 issued and 219,822,025 and 222,456,472 outstanding at June 30, 2018 and December 31, 2017, respectively 2,667 2,662
Additional paid-in capital 2,805,575 2,785,823
Retained earnings 2,047,379 2,105,897
Accumulated other comprehensive income 3,308 6,822
Treasury stock, at cost, 46,865,608 and 43,802,611 shares at June 30, 2018 and December 31, 2017, respectively (978,590) (918,711)
Total stockholders' equity 3,880,339 3,982,493
Total liabilities and stockholders' equity $ 5,953,990 $ 5,758,856