Principles Of Preparation (Supplemental Cash Flow Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Accounting Policies [Abstract]
Interest on long-term debt and borrowing under the revolving credit facility	$ 10,005	$ 9,763
Income taxes paid (refund)	0	(5,586)
Grants of restricted shares of common stock	785	1,989
Issuance of performance shares	1,193	565
Acquisition of treasury stock for options exercised	$ 0	$ 500