CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 147,315	$ 1,103,540
Trading securities	0	286,396
Accounts receivable (less accumulated provision for doubtful accounts: $8,226 in 2017; $6,923 in 2016)	725,236	341,628
Derivative instruments, at fair value	241,952	33,053
Prepaid expenses and other	48,552	63,602
Total current assets	1,163,055	1,828,219
Property, plant and equipment	30,990,309	18,216,775
Less: accumulated depreciation and depletion	6,105,294	5,054,559
Net property, plant and equipment	24,885,015	13,162,216
Restricted cash	0	75,000
Intangible assets, net	736,360	0
Goodwill	1,998,726	0
Investment in unconsolidated entity	460,546	184,562
Other assets	278,902	222,925
Total assets	29,522,604	15,472,922
Current liabilities:
Current portion of Senior Notes	7,999	0
Accounts payable	654,624	309,978
Derivative instruments, at fair value	139,089	257,943
Other current liabilities	430,525	236,719
Total current liabilities	1,232,237	804,640
Credit facility borrowings	1,761,000	0
Senior Notes	5,562,555	3,289,459
Deferred Tax Liabilities, Net	1,768,900	1,760,004
Other liabilities and credits	783,299	499,572
Total liabilities	11,107,991	6,353,675
Shareholders’ equity
Common stock, no par value, authorized 320,000 shares, shares issued: 267,871 in 2017 and 177,896 in 2016	9,388,903	3,440,185
Treasury stock, shares at cost: 3,551 in 2017 (including 253 held in rabbi trust) and 5,069 in 2016 (including 226 held in rabbi trust)	(63,602)	(91,019)
Retained earnings	3,996,775	2,509,073
Accumulated other comprehensive (loss) income	(2,458)	2,042
Total common shareholders’ equity	13,319,618	5,860,281
Noncontrolling interests in consolidated subsidiaries	5,094,995	3,258,966
Total equity	18,414,613	9,119,247
Total liabilities and equity	$ 29,522,604	$ 15,472,922

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.