Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 14,324	$ 10,817
Accounts receivable-trade, net	293,871	237,989
Inventories	103,432	101,124
Other	30,504	26,174
Total current assets	442,131	376,104
FIXED ASSETS, at cost	617,611	541,138
Less: Accumulated depreciation	(131,928)	(124,213)
Net fixed assets	485,683	416,925
NET INVESTMENT IN DIRECT FINANCING LEASES, net of unearned income	161,235	162,460
EQUITY INVESTEES	536,749	326,947
INTANGIBLE ASSETS, net of amortization	88,444	93,356
GOODWILL	325,046	325,046
OTHER ASSETS, net of amortization	30,987	30,006
TOTAL ASSETS	2,070,275	1,730,844
CURRENT LIABILITIES:
Accounts payable-trade	251,849	199,357
Accrued liabilities	43,036	50,071
Total current liabilities	294,885	249,428
SENIOR SECURED CREDIT FACILITY	438,200	409,300
SENIOR UNSECURED NOTES	350,981	250,000
DEFERRED TAX LIABILITIES	12,512	12,549
OTHER LONG-TERM LIABILITIES	23,108	16,929
COMMITMENTS AND CONTINGENCIES (Note 15)
PARTNERS' CAPITAL:
Common unitholders, 79,465 and 71,965 units issued and outstanding at March 31, 2012 and December 31, 2011, respectively	950,589	792,638
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$ 2,070,275	$ 1,730,844