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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash Flows from Operating Activities:    
Net income $ 26,254 $ 28,516
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization expense 44,681 40,296
Amortization of debt related items (2,912) (1,973)
Deferred income tax expense (benefit) (1,042) (551)
Equity in earnings of joint venture (2,386) (2,388)
Distributions of equity in earnings of joint venture 0 2,923
Changes in current assets and current liabilities (Note 12) (76,458) (232,899)
Other, net 2,250 278
Net cash provided by (used in) operating activities (9,613) (165,798)
Cash Flows from Investing Activities:    
Reliability capital expenditures (6,805) (7,372)
Strategic capital expenditures (93,479) (65,874)
Acquisitions 0 (52,577)
Investment in other long-term assets (94) (636)
Other, net 164 58
Net cash used in investing activities (100,214) (126,401)
Cash Flows from Financing Activities:    
Proceeds from long-term debt borrowings 454,118 343,680
Proceeds from short-term debt borrowings 56,430 31,600
Proceeds from senior note offering, net of issuance costs 247,408 0
Long-term debt repayments (453,944) (82,394)
Short-term debt repayments (56,430) (31,600)
Distributions to unitholders and general partner (89,076) (79,616)
Proceeds from (payments for) termination of interest rate swaps (25,358) 0
Other, net (3,228) (1,144)
Net cash provided by financing activities 129,920 180,526
Effect of foreign exchange rate changes on cash 106 989
Net increase (decrease) in cash and cash equivalents 20,199 (110,684)
Cash and cash equivalents as of the beginning of the period 17,497 181,121
Cash and cash equivalents as of the end of the period $ 37,696 $ 70,437