Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance	$ 165,367	$ 168,105	$ 149,847	$ 179,183
Valuation Allowances and Reserves, Charged to Cost and Expense	7,729	18,507	(10,838)
Valuation Allowances and Reserves, Write-offs	(15,091)	(248)	(2,534)
Valuation Allowances and Reserves, Charged to Other Accounts	4,624	(1)	(15,964)
Valuation Allowances and Reserves, Balance	$ 165,367	$ 168,105	$ 149,847