CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 37,839	$ 35,152
Accounts receivable, net of allowance for doubtful accounts of $3,116 and $3,191 at September 30, 2017 and December 31, 2016, respectively	544,509	148,091
Federal and state income taxes receivable	630	2,126
Inventory	40,672	20,191
Other	54,647	41,322
Total current assets	678,297	246,882
Property and equipment, net	4,198,285	3,408,963
Goodwill and intangible assets	533,682	88,966
Deposits on equipment purchases	15,027	16,050
Deferred tax assets, net	2,562	4,124
Other	45,122	7,306
Total assets	5,472,975	3,772,291
Current liabilities:
Accounts payable	303,522	125,667
Accrued expenses	245,826	139,148
Total current liabilities	549,348	264,815
Borrowings under revolving credit facility	144,000
Long-term debt, net of debt issuance cost of $1,303 and $1,563 at September 30, 2017 and December 31, 2016, respectively	598,697	598,437
Deferred tax liabilities, net	576,312	650,661
Other	11,416	9,654
Total liabilities	1,879,773	1,523,567
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 300,000,000 shares with 257,428,497 and 191,525,872 issued and 213,652,526 and 148,133,255 outstanding at September 30, 2017 and December 31, 2016, respectively	2,574	1,915
Additional paid-in capital	2,588,327	1,042,696
Retained earnings	1,914,966	2,116,341
Accumulated other comprehensive income (loss)	5,461	(1,134)
Treasury stock, at cost, 43,775,971 and 43,392,617 shares at September 30, 2017 and December 31, 2016, respectively	(918,126)	(911,094)
Total stockholders' equity	3,593,202	2,248,724
Total liabilities and stockholders' equity	$ 5,472,975	$ 3,772,291

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Balance Type:	credit
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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.