Debt (Schedule Of Interest Expense, Net) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest expense:
Contractual and other interest expense	$ 10,600,000	$ 9,600,000	$ 20,400,000	$ 17,500,000
Accretion of senior convertible note discount	1,400,000	1,300,000	2,800,000	2,600,000
Amortization of deferred financing costs	900,000	1,000,000	1,900,000	2,000,000
Total interest expense	12,900,000	11,900,000	25,100,000	22,100,000
Interest income	0	(100,000)	(100,000)	(200,000)
Interest expense, net	$ 12,949,000	$ 11,838,000	$ 24,952,000	$ 21,883,000