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	$ 13,103	$ 5,581	$ 3,901
Change	15,898	7,522	1,680
Balance at End of Year	$ 29,001	$ 13,103	$ 5,581