Income Taxes (Details 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Current
Federal									$ (18,194)	$ 348
State and local									314	245
Foreign									1,413	472
Total current									(16,467)	1,065
Deferred
Federal									(470)	(9,886)
State and local									(181)	(747)
Foreign									(994)	(326)
Total deferred									(1,645)	(10,959)
Total income tax benefit									(18,112)	(9,894)
Results of operation, income before income taxes
United States									(4,873)	(49,731)
Foreign									4,311	(2,023)
Loss before income taxes	$ (5,673)	$ (11,421)	$ (7,318)	$ 23,849	$ (35,942)	$ (2,098)	$ (4,852)	$ (8,862)	$ (562)	$ (51,754)