Debt (Schedule of Interest Expense, Net) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest expense:
Contractual and other interest expense	[1]	$ 12,200	$ 10,600	$ 23,000	$ 20,400
Accretion of senior convertible note discount		0	1,400	0	2,800
Amortization of deferred financing costs		700	900	1,300	1,900
Total interest expense		12,900	12,900	24,300	25,100
Interest income		0	0	(400)	(100)
Interest expense, net		12,907	$ 12,949	23,880	$ 24,952
Senior Notes [Member] | 4.875% Senior Notes [Member] | Interest Expense [Member]
Interest expense:
Debt instrument, payments for consent fee, solicitation agent		$ 800		$ 800

[1] Contractual and other interest expense includes $0.8 million of consent solicitation agent fees for the three and six month periods ended June 30, 2015 related to the delay in filing of the 2014 Form 10-K and the First Quarter 2015 Form 10-Q.