Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 15,983	$ 11,282
Accounts receivable-trade, net	356,972	270,925
Inventories	79,155	87,050
Other	30,147	34,777
Total current assets	482,257	404,034
FIXED ASSETS, at cost	759,892	723,225
Less: Accumulated depreciation	(168,147)	(157,944)
Net fixed assets	591,745	565,281
NET INVESTMENT IN DIRECT FINANCING LEASES, net of unearned income	156,055	157,385
EQUITY INVESTEES	608,076	549,235
INTANGIBLE ASSETS, net of amortization	72,222	75,065
GOODWILL	325,046	325,046
OTHER ASSETS, net of amortization	39,882	33,618
TOTAL ASSETS	2,275,283	2,109,664
CURRENT LIABILITIES:
Accounts payable-trade	312,719	258,053
Accrued liabilities	60,660	54,598
Total current liabilities	373,379	312,651
SENIOR SECURED CREDIT FACILITY	271,000	500,000
SENIOR UNSECURED NOTES	700,865	350,895
DEFERRED TAX LIABILITIES	13,488	13,810
OTHER LONG-TERM LIABILITIES	16,600	15,813
COMMITMENTS AND CONTINGENCIES (Note 13)
PARTNERS' CAPITAL:
Common unitholders, 81,202,752 units issued and outstanding at March 31, 2013 and December 31, 2012	899,951	916,495
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$ 2,275,283	$ 2,109,664