Principles Of Preparation (Supplemental Cash Flow Disclosures) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2010
Accounting Policies [Abstract]
Interest on long-term debt and borrowing under the revolving credit facility		$ 34,110	$ 33,474
Income taxes paid (refund)		(3,031)	5,778
Grants of restricted shares of common stock		3,231	2,057
Issuance of performance shares		628	662
Acquisition of treasury stock for options exercised		500	0
Unsettled repurchase of common stock	$ 12,491	$ 12,491	$ 0