Principles Of Preparation (Supplemental Cash Flow Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]
Interest on long-term debt and borrowing under the revolving credit facility	$ 36,975	$ 35,922
Income taxes paid (refund), net	(36)	3,834
Grants of restricted shares of common stock	2,607	2,384
Issuance of performance shares	$ 849	$ 1,193