CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income (loss)	$ (27,056)	$ (1,086)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and depletion	37,894	(408)
Accretion	3,667	4,576
Impairments	0	4,187
Loss (income) from unconsolidated affiliates, net of tax	(632)	1,078
Distributions of income from unconsolidated affiliates	3,500	1,500
Deferred income taxes	0	(1,944)
Equity-based compensation expense	2,506	3,900
(Gain) loss on derivative financial instruments	3,939	(6,325)
Cash received (paid) for derivative financial instruments settlements	(1,147)	(2,640)
Non-cash interest expense related to early retiremnt of debt and refinancings	702	0
Net periodic postretirement benefit costs	(2,736)	995
Payments for logistics contracts	(17,000)	(7,500)
Logistics throughput contract amortization expense	18,998	16,333
Other	4,296	662
Changes in operating assets and liabilities:
Accounts receivable	269	5,563
Inventories, net	(1,395)	2,019
Due to or from related parties	(478)	(570)
Other assets	(6,160)	10,813
Accounts payable and accrued expenses	(6,100)	(42,654)
Asset retirement obligations	(520)	(712)
Net cash provided by (used in) operating activities	12,547	(12,213)
Investing activities
Purchases of property, plant and equipment	(7,896)	(12,075)
Cash paid for capitalized interest	0	(945)
Investment in development projects	(2,110)	(1,500)
Insurance proceeds		2,826
Other	33	45
Net cash provided by (used in) investing activities	(9,973)	(11,649)
Financing activities
Repayment of senior notes	(62,094)	0
Payment of debt refinancing costs	(406)	0
Payments of deferred financing costs		(191)
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	(1,312)	(1,133)
Net cash provided by (used in) financing activities	(5,746)	(1,324)
Net increase (decrease) in cash and cash equivalents	(3,172)	(25,186)
Cash and cash equivalents at beginning of period	83,708	89,313
Cash and cash equivalents at end of period	80,536	64,127
Supplemental cash flow disclosures
Interest paid	18,605	20,665
Income taxes paid (refunded)	(85)	(2,796)
Supplemental noncash investing and financing activities
Capital expenditures included in accounts payable	1,365	1,652
Assets acquired under capital leases	$ 0	$ 115