Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (5,349)
Currency translation	(1,955)	$ (1,035)	$ (802)
Ending Balance	(7,255)	(5,349)
Accumulated Short- term Investment Transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	0	0	1,213
Unrealized gain on Available for Sale Securities, net of tax effect			(1,213)
Ending Balance	0	0	0
Accumulated Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(275)	760	1,562
Currency translation	(1,955)	(1,035)	(802)
Ending Balance	(2,230)	(275)	760
Accumulated Postretirement Transactions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(5,074)	(2,254)	(3,162)
Minimum pension liability re-valuation, net of tax effect	(414)	(2,784)	2,877
Amortization of net actuarial gain, net of tax effect	463	(36)	(1,969)
Ending Balance	(5,025)	(5,074)	(2,254)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(5,349)	(1,494)	(387)
Currency translation	(1,955)	(1,035)	(802)
Minimum pension liability re-valuation, net of tax effect	(414)	(2,784)	2,877
Amortization of net actuarial gain, net of tax effect	463	(36)	(1,969)
Unrealized gain on Available for Sale Securities, net of tax effect			(1,213)
Ending Balance	$ (7,255)	$ (5,349)	$ (1,494)