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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash Flows from Operating Activities:      
Net income $ 221,601 $ 238,970 $ 224,875
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 168,286 153,802 145,743
Amortization of debt related items (12,392) (7,767) (7,122)
Gain on sale or disposition of assets, including insurance recoveries (262) (12,990) (30,704)
Deferred income tax expense (benefit) 4,351 (1,733) (2,037)
Equity in earnings of joint venture (11,458) (10,500) (9,615)
Distributions of equity in earnings of joint venture 14,374 9,625 9,700
Changes in current assets and current liabilities (Note 21) (265,453) (6,867) (142,898)
Other, net (24,579) (40) (7,360)
Net cash provided by operating activities 94,468 362,500 180,582
Cash Flows from Investing Activities:      
Reliability capital expenditures (41,349) (50,562) (44,951)
Strategic capital expenditures (294,311) (219,268) (163,605)
Acquisitions (100,690) (43,026) 0
Investment in other long-term assets (8,990) (3,469) (211)
Proceeds from sale or disposition of assets 2,086 2,610 29,680
Proceeds from insurance recoveries 0 13,500 11,382
Net cash used in investing activities (443,254) (300,215) (167,705)
Cash Flows from Financing Activities:      
Proceeds from long-term debt borrowings 915,749 899,365 1,159,436
Proceeds from short-term debt borrowings 33,800 177,041 448,752
Proceeds from senior note offering, net of issuance costs 0 445,431 0
Long-term debt repayments (768,150) (1,204,313) (1,190,247)
Short-term debt repayments (33,800) (197,041) (450,872)
Proceeds from issuance of common units, net of issuance costs 317,285 240,148 288,761
Contributions from general partner 6,708 5,078 6,155
Distributions to unitholders and general partner (322,046) (305,154) (263,896)
Proceeds from termination of interest rate swaps 33,433 0 0
Other, net 3,742 (4,289) (761)
Net cash provided by (used in) financing activities 186,721 56,266 (2,672)
Effect of foreign exchange rate changes on cash (1,559) 564 6,426
Net (decrease) increase in cash and cash equivalents (163,624) 119,115 16,631
Cash and cash equivalents as of the beginning of the period 181,121 62,006 45,375
Cash and cash equivalents as of the end of the period $ 17,497 $ 181,121 $ 62,006