Schedule II - Valuation And Qualifying Accounts (Details) - Valuation reserve for deferred tax assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves
Balance at Beginning of Year	$ 20,672	$ 18,214	$ 15,133
Other Additions	10,001	2,458	3,081
Deductions	(927)	0	0
Balance at End of Year	$ 29,746	$ 20,672	$ 18,214