Schedule II - Valuation and Qualifying Accounts (Details) (Valuation Allowance of Deferred Tax Assets [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance	$ 149,847	$ 179,183	$ 209,757	$ 214,269
Valuation Allowances and Reserves, Charged to Cost and Expense	(10,838)	(16,860)	(1,626)
Valuation Allowances and Reserves, Write-offs	(2,534)	(15,555)	(1,486)
Valuation Allowances and Reserves, Charged to Other Accounts	(15,964)	1,841	(1,400)
Valuation Allowances and Reserves, Balance	$ 149,847	$ 179,183	$ 209,757	$ 214,269