Equity-Based Compensation (Details Of Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation expense	$ 4,067	$ 4,404	$ 3,952
Director deferred compensation expense (income)	2,008	619	946
Actual tax benefit realized for tax deductions from equity-based plans	525	0	0
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation expense	3,440	3,821	3,368
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation expense	$ 627	$ 583	$ 584