Principles Of Preparation (Supplemental Cash Flow Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Accounting Policies [Abstract]
Interest on long-term debt and borrowing under the revolving credit facility	$ 25,106	$ 24,256
Income taxes paid (refund), net	3,159	(3,101)
Grants of restricted shares of common stock	2,331	3,193
Issuance of performance shares	1,193	565
Acquisition of treasury stock for options exercised	$ 0	$ 500