Share-Based Compensation Expense (Schedule Of Total Share-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share-Based Compensation Expense [Abstract]
Amortization of restricted stock and restricted stock unit awards	$ 2,274	$ 2,630	$ 4,682	$ 4,762
Amortization of stock option awards	193	185	386	477
Discount given on employee stock purchase transactions through our Employee Stock Purchase Plan	55	51	168	139
Total share-based compensation	$ 2,522	$ 2,866	$ 5,236	$ 5,378