Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance	$ (1,494)
Currency translation	(1,035)	(802)	279
Ending Balance	(5,349)	(1,494)
Accumulated Short- term Investment Transactions [Member]
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance		1,213
Unrealized gain on Available for Sale Securities, net of tax effect		(1,213)	1,213
Ending Balance	0	0	1,213
Accumulated Currency Translation [Member]
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance	760	1,562	1,283
Currency translation	(1,035)	(802)	279
Ending Balance	(275)	760	1,562
Accumulated Postretirement Transactions [Member]
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance	(2,254)	(3,162)	(2,481)
Minimum pension liability re-valuation, net of tax effect	(2,784)	2,877	(375)
Amortization of net actuarial gain, net of tax effect	(36)	(1,969)	(306)
Ending Balance	(5,074)	(2,254)	(3,162)
Accumulated Other Comprehensive Income [Member]
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance	(1,494)	(387)	(1,198)
Currency translation	(1,035)	(802)	279
Minimum pension liability re-valuation, net of tax effect	(2,784)	2,877	(375)
Amortization of net actuarial gain, net of tax effect	(36)	(1,969)	(306)
Unrealized gain on Available for Sale Securities, net of tax effect		(1,213)	1,213
Ending Balance	$ (5,349)	$ (1,494)	$ (387)