Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Balance at beginning of period	$ 3,748	$ 945	$ 456
Charge to expenses	1,323	600	545
Additions/(deductions)	(8)	2,203	(56)
Balance at end of period	5,063	3,748	945
Valuation Allowance of Deferred Tax Assets [Member]
Balance at beginning of period	$ 3,395	$ 1,365	$ 1,871
Charge to expenses
Additions/(deductions)	$ (3,395)	$ 2,030	$ (506)
Balance at end of period		$ 3,395	$ 1,365