Debt (Schedule of Interest Expense, Net) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest expense:
Contractual and other interest expense	[1]	$ 11,300		$ 11,300	$ 34,300	$ 31,600
Accretion of senior convertible note discount		0		600	0	3,400
Amortization of deferred financing costs		700		800	2,000	2,700
Total interest expense		12,000		12,700	36,300	37,700
Interest income		0		(100)	(500)	(100)
Interest expense, net		$ 11,964		$ 12,643	35,845	$ 37,595
Interest Expense [Member] | Financing Receivable [Member]
Interest expense:
Non-recourse financing arrangement, discount charge					$ 1,100
Interest Expense [Member] | Senior Notes [Member] | 4.875% Senior Notes [Member]
Interest expense:
Debt instrument, payments for consent fee, solicitation agent			$ 800

[1] Contractual and other interest expense for the nine month period ended September 30, 2015 includes $0.8 million of consent solicitation agent fees that were incurred in the second quarter of 2015 related to the delay in filing of the Company’s 2014 Form 10-K and its First Quarter 2015 Form 10-Q, as well as $1.1 million of discount fees related to financing arrangements.