Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance at Beginning of period	$ 1,070			$ 1,786
Other comprehensive income before reclassifications	6			(606)
Amounts reclassified from accumulated other comprehensive income	(192)			(296)
Current period other comprehensive income, net	(186)			(902)
Ending balance at End of period	884			884
Amortization of pension and postretirement benefit plans [Abstract]
Prior service benefit	755		1,080	1,509		2,160
Unrecognized loss	(546)		(776)	(1,138)		(1,561)
Income tax benefit	(17)		(51)	(75)		(159)
Total reclassifications for the period	48,847		50,588	96,441		100,198
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of pension and postretirement benefit plans [Abstract]
Prior service benefit	(755)	[1]		(1,509)	[1]
Unrecognized loss	546	[1]		1,138	[1]
Total before income tax	(209)			(371)
Income tax benefit	17			75
Total reclassifications for the period	(192)			(296)
Foreign Currency Translation Adjustments [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance at Beginning of period	2,972			3,562
Other comprehensive income before reclassifications	(141)			(731)
Amounts reclassified from accumulated other comprehensive income	0			0
Current period other comprehensive income, net	(141)			(731)
Ending balance at End of period	2,831			2,831
Unrecognized Pension and Postretirement Benefit Costs (Credit) [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance at Beginning of period	(1,902)			(1,776)
Other comprehensive income before reclassifications	147			125
Amounts reclassified from accumulated other comprehensive income	(192)			(296)
Current period other comprehensive income, net	(45)			(171)
Ending balance at End of period	$ (1,947)			$ (1,947)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement benefit costs, which are included in selling, general and administrative expenses in our consolidated statements of operations (see Note 11 for additional details).