Cash and Cash Equivalents (Tables)

3 Months Ended

Mar. 31, 2013

Cash and Cash Equivalents

Cash and Cash Equivalents

	March 31, 2013		December 31, 2012
	($ in thousands)
Cash at banks	$	27,409	$	65,935
Money market funds		205,791		1,105,148
Held-to-maturity securities(1)		92,556		254,732
	$	325,756	$	1,425,815

(1)

These securities mature three months or less from the date of purchase.