SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash paid / (received) during the year:
Interest on debt	$ 171,360,000	$ 159,674,000	$ 158,033,000
Income taxes	(27,211,000)	51,239,000	20,122,000
Noncash investing and financing activities:
Stock-based compensation	10,739,000	12,280,000	12,517,000
Decrease in collateral for securities lending transactions			(96,653,000)
Interest on long-term debt	90,000,000
Interest on subordinated debt	34,800,000
Interest on other and non-recourse funding obligations	$ 46,600,000