Principles Of Preparation (Supplemental Cash Flow Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Supplemental Cash Flow Information [Abstract]
Interest on long-term debt and borrowing under the revolving credit facility	$ 35,922	$ 34,234
Income taxes paid (refunded), net	3,834	(3,031)
Grants of restricted shares of common stock	2,384	3,231
Issuance of performance shares	1,193	628
Acquisition of treasury stock for options exercised	0	500
Unsettled repurchase of common stock	$ 0	$ 12,491