SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash paid / (received) during the year:
Interest expense	$ 110,301	$ 92,175	$ 89,657
Income taxes	(54,370)	77,665	25,129
Noncash investing and financing activities:
Increase (Decrease) in Collateral Held under Securities Lending			$ (96,653)