CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income (loss)	$ (20,108)	$ (36,375)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and depletion	18,645	19,102
Accretion	1,821	2,582
Impairments	0	4,154
Loss (income) from unconsolidated affiliates, net of tax	(326)	748
Distributions of income from unconsolidated affiliates	3,000	1,500
Deferred income taxes	0	(971)
Equity-based compensation expense	1,823	2,092
(Gain) loss on derivative financial instruments	2,344	1,962
Cash received (paid) for derivative financial instruments settlements	(336)	(2,309)
Non-cash interest expense related to early retiremnt of debt and refinancings	702	0
Net periodic postretirement benefit costs	(1,368)	2,413
Addback of debt restructuring costs	40	0
Payments for logistics contracts	(13,563)	0
Logistics throughput contract amortization expense	10,578	8,167
Other	2,150	(278)
Changes in operating assets and liabilities:
Accounts receivable	16,613	10,535
Inventories, net	(1,373)	1,453
Due to or from related parties	(419)	231
Other assets	(8,024)	5,553
Accounts payable and accrued expenses	7,744	(20,880)
Asset retirement obligations	(248)	(337)
Net cash provided by (used in) operating activities	19,695	(658)
Investing activities
Purchases of property, plant and equipment	(4,124)	(7,621)
Cash paid for capitalized interest	0	(352)
Investment in development projects	0	(750)
Other	0	18
Net cash provided by (used in) investing activities	(4,124)	(8,705)
Financing activities
Repayment of senior notes	(62,094)	0
Payment of debt refinancing costs	(402)	0
Payment of debt restructuring costs	(40)	0
Proceeds from issuance of common stock	68,850	0
Cash paid for equity offering	(4,434)	0
Other	(644)	(558)
Net cash provided by (used in) financing activities	1,236	(558)
Net increase (decrease) in cash and cash equivalents	16,807	(9,921)
Cash and cash equivalents at beginning of period	83,708	89,313
Cash and cash equivalents at end of period	100,515	79,392
Supplemental cash flow disclosures
Interest paid	4,893	7,765
Income taxes paid (refunded)	(257)	27
Supplemental noncash investing and financing activities
Capital expenditures included in accounts payable	869	1,552
Assets acquired under capital leases	$ 0	$ 115