SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenue) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Product sales	$ 795,096	$ 746,392	$ 2,034,521	$ 1,915,032
Freight and delivery revenues	78,483	67,176	204,621	175,431
Total revenues	$ 873,579	$ 813,568	$ 2,239,142	$ 2,090,463