Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows Provided By Operating Activities	$ 78,109	$ 109,533
Cash Flows from Investing Activities
Additions to fixed assets and computer software	(5,005)	(4,860)
Proceeds from sale of assets	20	15,391
Net cash (used in) provided by investing activities	(4,985)	10,531
Cash Flows from Financing Activities
Credit facilities repayments	(213,743)	(94,846)
Debt issuance costs and other financing items, net	(1,979)	315
Decrease in checks not yet presented for payment	(140)	(16,743)
Net cash used in financing activities	(215,862)	(111,274)
(Decrease) increase in cash and cash equivalents	(142,738)	8,790
Cash and cash equivalents, beginning of period	257,939	127,852
Cash and cash equivalents, end of period	115,201	136,642
Supplemental Information:
Cash interest, net	42,198	63,716
Cash income taxes, net	3,018	(626)
Non-cash Financing Activities:
Reduction of debt from debt repurchases	$ (72,613)	$ 0