Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income / (Loss) [Abstract]
Beginning Balance	$ 0	$ 17	$ 592
Amortization of prior service cost	0	0	(344)
Foreign currency translation	(2)	(17)	(231)
Ending Balance	$ (2)	$ 0	$ 17