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Consolidated Statements of Cash Flows - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income (loss) $ (571,720) $ 108,830 $ 172,078
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Asset impairment 681,594 26,209 734
Depreciation, depletion and amortization 100,828 79,876 64,377
Distributions from equity earnings from unconsolidated investments 46,795 43,005 24,113
Equity earnings from unconsolidated investment (49,918) (41,416) (34,186)
Gain on reserve swap (9,290) (5,690) (8,149)
Other, net (1,295) 1,942 (8,721)
Other, net—affiliates (287) 0 0
Change in operating assets and liabilities:      
Accounts receivable 16,486 (8,685) 2,593
Accounts receivable—affiliates 2,630 (1,828) 2,947
Accounts payable (3,775) (2,408) 1,633
Accounts payable—affiliates 514 559 (566)
Accrued liabilities (4,676) (1,821) 7,927
Deferred revenue 7,605 2,056 4,164
Deferred revenue—affiliates (4,200) 15,618 15,076
Accrued incentive plan expenses (7,023) (5,265) 2,284
Other items, net (1,030) (47) (516)
Other items, net—affiliates 186 (180) 1,286
Net cash provided by operating activities 203,424 210,755 247,074
Cash flows from investing activities:      
Acquisition of mineral rights (40,679) (356,026) (72,000)
Acquisition of plant and equipment and other (10,175) (2,454) 0
Proceeds from sale of plant and equipment and other 11,024 1,006 0
Proceeds from sale of mineral rights 7,096 412 10,929
Acquisition of equity interests 0 0 (293,085)
Acquisition of aggregates business 0 (168,978) 0
Return of equity and other unconsolidated investments 0 3,633 48,833
Return of long-term contract receivables—affiliate 2,463 1,904 2,558
Net cash used in investing activities (30,271) (520,503) (302,765)
Cash flows from financing activities:      
Proceeds from loans 100,000 617,471 567,020
Proceeds from loans—affiliate 0 19,904 0
Proceeds from issuance of common units 0 127,202 75,000
Capital contribution by general partner 0 3,240 1,531
Repayments of loans (190,983) (327,983) (386,230)
Distributions to partners (71,758) (162,042) (246,518)
Distributions to non-controlling interest (2,744) (974) (2,521)
Debt issue costs and other (5,971) (9,507) (9,502)
Net cash provided by (used in) financing activities (171,456) 267,311 (1,220)
Net increase (decrease) in cash and cash equivalents 1,697 (42,437) (56,911)
Cash and cash equivalents at beginning of period 50,076 92,513 149,424
Cash and cash equivalents at end of period 51,773 50,076 92,513
Supplemental cash flow information:      
Cash paid during the period for interest 88,493 76,155 55,191
Non-cash investing activities:      
Plant, equipment and mineral rights funded with accounts payable or accrued liabilities $ 5,949 $ 11,879 $ 3,019
Units issued for acquisition of aggregate operations (in shares) 0 31,604 0
Non-cash contingent consideration on equity investments $ 0 $ 0 $ 15,000