Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Financing activities
Net loss resulting from early retirement of debt and debt restructuring	$ (2,400)	$ (2,200)
Cash and cash equivalents, beginning of period	305,372
Cash and cash equivalents, end of period	298,337
Successor
Operating activities
Net income (loss)	157,179
Adjustments to reconcile to cash provided by operating activities:
Depreciation, depletion and amortization	94,536
Accretion on asset retirement obligations	22,826
Amortization of sales contracts, net	42,903
Prepaid royalties expensed	2,905
Deferred income taxes	6,069
Employee stock-based compensation expense	7,485
Gains on disposals and divestitures, net	(23,006)
Asset impairment and non-cash mine closure costs	0
Net loss resulting from early retirement of debt and debt restructuring	2,547
Non-cash bankruptcy reorganization items	0
Amortization relating to financing activities	2,628
Changes in:
Receivables	(24,110)
Inventories	(13,102)
Accounts payable, accrued expenses and other current liabilities	5,103
Income taxes, net	(2,430)
Other	20,612
Cash provided by (used in) operating activities	302,145
Investing activities
Capital expenditures	(30,503)
Minimum royalty payments	(5,033)
Proceeds from (consideration paid for) disposals and divestitures	11,432
Purchases of short term investments	(191,327)
Proceeds from sales of short term investments	123,996
Investments in and advances to affiliates, net	(9,216)
Withdrawals of restricted cash	71,048
Cash provided by (used in) investing activities	(29,603)
Financing activities
Proceeds from issuance of term loan due 2024	298,500
Payments to extinguish term loan due 2021	(325,684)
Payments on term loan due 2024	(1,500)
Net payments on other debt	(5,992)
Debt financing costs	(10,043)
Net loss resulting from early retirement of debt and debt restructuring	(2,360)
Dividends paid	(16,763)
Purchases of treasury stock	(215,735)
Cash used in financing activities	(279,577)
Decrease in cash and cash equivalents	(7,035)
Cash and cash equivalents, beginning of period	305,372
Cash and cash equivalents, end of period	$ 298,337
Predecessor
Operating activities
Net income (loss)		(434,010)
Adjustments to reconcile to cash provided by operating activities:
Depreciation, depletion and amortization		191,581
Accretion on asset retirement obligations		24,321
Amortization of sales contracts, net		(728)
Prepaid royalties expensed		4,791
Deferred income taxes		(419)
Employee stock-based compensation expense		2,096
Gains on disposals and divestitures, net		(6,628)
Asset impairment and non-cash mine closure costs		119,194
Net loss resulting from early retirement of debt and debt restructuring		2,213
Non-cash bankruptcy reorganization items		(16,634)
Amortization relating to financing activities		12,800
Changes in:
Receivables		(42,787)
Inventories		34,604
Accounts payable, accrued expenses and other current liabilities		90,920
Income taxes, net		(4,217)
Other		(8,331)
Cash provided by (used in) operating activities		(31,234)
Investing activities
Capital expenditures		(82,434)
Minimum royalty payments		(305)
Proceeds from (consideration paid for) disposals and divestitures		(2,921)
Purchases of short term investments		(98,750)
Proceeds from sales of short term investments		187,006
Investments in and advances to affiliates, net		(3,440)
Withdrawals of restricted cash		15,979
Cash provided by (used in) investing activities		15,135
Financing activities
Payments on term loan due 2024		0
Net payments on other debt		(12,083)
Debt financing costs		(20,181)
Net loss resulting from early retirement of debt and debt restructuring		(2,213)
Dividends paid		0
Purchases of treasury stock		0
Cash used in financing activities		(34,477)
Decrease in cash and cash equivalents		(50,576)
Cash and cash equivalents, beginning of period		450,781
Cash and cash equivalents, end of period		$ 400,205