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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities:    
Net income (loss) $ 155,532 $ 84,190
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 147,879 124,465
Unit-based compensation expense 4,277 5,117
Amortization of debt related items 3,965 3,146
Gain from sale or disposition of assets (1,218) (36)
Gain from insurance recoveries (78,756) 0
Deferred income tax expense 1,142 23
Changes in current assets and current liabilities (Note 15) 42,733 (15,344)
(Increase) decrease in other long-term assets (11,224) 2,698
(Decrease) increase in other long-term liabilities (20,073) 5,494
Other, net (407) (765)
Net cash provided by operating activities 243,850 208,988
Cash flows from investing activities:    
Capital expenditures (248,521) (108,849)
Change in accounts payable related to capital expenditures (19,320) 6,851
Proceeds from sale or disposition of assets 2,097 1,966
Proceeds from Axeon term loan 0 110,000
Proceeds from insurance recoveries 78,419 0
Acquisitions (37,502) (1,476,719)
Net cash used in investing activities (224,827) (1,466,751)
Cash flows from financing activities:    
Proceeds from long-term debt borrowings 677,272 1,037,161
Proceeds from short-term debt borrowings 456,000 565,000
Proceeds from note offering, net of issuance costs 0 543,313
Long-term debt repayments (905,521) (1,122,239)
Short-term debt repayments (428,000) (574,000)
Proceeds from issuance of Series D preferred units 400,000 0
Payment of issuance costs for Series D preferred units (29,289) 0
Proceeds from issuance of other preferred units, net of issuance costs 0 371,802
Proceeds from issuance of common units, net of issuance costs 10,000 643,858
Contributions from general partner 0 13,597
Distributions to preferred unitholders (32,713) (10,696)
Distributions to common unitholders and general partner (172,324) (216,139)
Proceeds from termination of interest rate swaps 8,048 0
(Decrease) increase in cash book overdrafts (436) 1,321
Other, net (5,587) (2,615)
Net cash (used in) provided by financing activities (22,550) 1,250,363
Effect of foreign exchange rate changes on cash (421) 649
Net increase (decrease) in cash and cash equivalents (3,948) (6,751)
Cash and cash equivalents as of the beginning of the period 24,292 35,942
Cash and cash equivalents as of the end of the period $ 20,344 $ 29,191