Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance			$ (387)
Currency translation	(410)	(231)	(658)		(2)
Unrealized gain on available for sales securities, tax impact			51
Reclassifications related to pension and postretirement plans, tax impact			60		(94)
Reclassifications related to available for sale securities, tax impact			702
Ending Balance	(2,164)		(2,164)
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		0
Currency translation			0		0
Unrealized gain on available for sale securities, net of tax effect of $51			93
Reclassifications related to pension and postretirement plans, net of tax effect of $94 and $60 for the six months ended June 30, 2012 and 2013 respectively			0	[1]	0	[1]
Reclassifications related to available for sale securities, net of tax effect of $702			(1,306)	[2]
Ending Balance	0	0	0		0
Accumulated Currency Translation [Member]
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance			1,562		1,283
Currency translation			(658)		(2)
Unrealized gain on available for sale securities, net of tax effect of $51			0
Reclassifications related to pension and postretirement plans, net of tax effect of $94 and $60 for the six months ended June 30, 2012 and 2013 respectively			0	[1]	0	[1]
Reclassifications related to available for sale securities, net of tax effect of $702			0	[2]
Ending Balance	904	1,281	904		1,281
Accumulated Postretirement Transactions [Member]
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance			(3,162)		(2,481)
Currency translation			0		0
Unrealized gain on available for sale securities, net of tax effect of $51			0
Reclassifications related to pension and postretirement plans, net of tax effect of $94 and $60 for the six months ended June 30, 2012 and 2013 respectively			94	[1]	(152)	[1]
Reclassifications related to available for sale securities, net of tax effect of $702			0	[2]
Ending Balance	(3,068)	(2,633)	(3,068)		(2,633)
Accumulated Other Comprehensive Income (Loss) [Member]
Summary of the balances of related after-tax components of accumulated other comprehensive income (loss)
Beginning Balance			(387)		(1,198)
Currency translation			(658)		(2)
Unrealized gain on available for sale securities, net of tax effect of $51			93
Reclassifications related to pension and postretirement plans, net of tax effect of $94 and $60 for the six months ended June 30, 2012 and 2013 respectively			94	[1]	(152)	[1]
Reclassifications related to available for sale securities, net of tax effect of $702			(1,306)	[2]
Ending Balance	$ (2,164)	$ (1,352)	$ (2,164)		$ (1,352)

[1] (1)—These accumulated other comprehensive income components related to amortization of actuarial loss/(gain) and prior period service costs/(benefits) and are included in the computation of net periodic costs for our pension and postretirement plans. See Note 13 for further details and pre-tax amounts.

[2] (2)—This accumulated other comprehensive income component relates to realized gains on available for sale securities sold. See Note 4 for further details and pre-tax amounts.