CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income (loss)	$ (24,478)	$ (2,670)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and depletion	56,683	23,052
Accretion	5,532	5,641
Impairments	0	4,499
Loss (income) from unconsolidated affiliates, net of tax	(771)	1,018
Distributions of income from unconsolidated affiliates	4,500	1,500
Deferred income taxes	0	(2,775)
Equity-based compensation expense	6,095	9,250
(Gain) loss on derivative financial instruments	3,102	(5,257)
Cash received (paid) for derivative financial instruments settlements	(1,968)	(3,195)
Non-cash interest expense related to early retirement of debt and refinancings	702	1,254
Net periodic postretirement benefit costs	(4,103)	(423)
Payments for logistics contracts	(20,438)	(15,000)
Logistics throughput contract amortization expense	27,419	24,500
Other	6,388	1,918
Changes in operating assets and liabilities:
Accounts receivable	(4,391)	(2,925)
Inventories, net	(1,212)	3,853
Due to or from related parties	(1,169)	81
Other assets	(5,545)	16,774
Accounts payable and accrued expenses	11,405	(23,717)
Asset retirement obligations	(719)	(1,048)
Net cash provided by (used in) operating activities	57,032	36,330
Investing activities
Purchases of property, plant and equipment	(11,327)	(30,148)
Cash paid for capitalized interest	0	(1,272)
Investment in development projects	(2,110)	(1,500)
Insurance proceeds		2,826
Other	33	46
Net cash provided by (used in) investing activities	(13,404)	(30,048)
Financing activities
Repayment of senior notes	(62,094)	0
Payment of debt refinancing costs	(408)	0
Payments of deferred financing costs		(3,581)
Payment amortized to deferred gain	(6,294)
Proceeds from issuance of common stock	68,850	0
Cash paid for equity offering	(4,490)	0
Other	(1,958)	(1,713)
Net cash provided by (used in) financing activities	(6,394)	(5,294)
Net increase (decrease) in cash and cash equivalents	37,234	988
Cash and cash equivalents at beginning of period	83,708	89,313
Cash and cash equivalents at end of period	120,942	90,301
Supplemental cash flow disclosures
Interest paid	21,485	28,287
Income taxes paid (refunded)	(538)	(8,247)
Supplemental noncash investing and financing activities
Capital expenditures included in accounts payable	1,036	1,794
Assets acquired under capital leases	$ 0	$ 115