Debt (Schedule Of Interest Expense, Net) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest expense:
Contractual and other interest expense	$ 11,300,000	$ 10,400,000	$ 31,600,000	$ 27,900,000
Accretion of senior convertible note discount	600,000	1,300,000	3,400,000	3,900,000
Amortization of deferred financing costs	800,000	1,000,000	2,700,000	3,000,000
Total interest expense	12,700,000	12,700,000	37,700,000	34,800,000
Interest income	(100,000)	0	(100,000)	(300,000)
Interest expense, net	$ 12,643,000	$ 12,666,000	$ 37,595,000	$ 34,549,000