Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance at Beginning of period	$ 3,879
Other comprehensive income before reclassifications	(1,476)
Amounts reclassified from accumulated other comprehensive income	(617)
Current period other comprehensive income, net	(2,093)
Ending balance at End of period	1,786		3,879
Amortization of pension and postretirement benefit plans [Abstract]
Prior service benefit	4,317		4,784	6,402
Unrecognized loss	(3,123)		(3,096)	(2,376)
Income tax benefit	(577)		(636)	2,660
Total reclassifications for the period	201,256		187,495	163,845
Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of pension and postretirement benefit plans [Abstract]
Prior service benefit	(4,317)	[1]
Unrecognized loss	3,123	[1]
Total before income tax	(1,194)
Income tax benefit	577
Total reclassifications for the period	(617)
Foreign Currency Translation Adjustments [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance at Beginning of period	4,663
Other comprehensive income before reclassifications	(1,101)
Amounts reclassified from accumulated other comprehensive income	0
Current period other comprehensive income, net	(1,101)
Ending balance at End of period	3,562
Unrecognized Pension and Postretirement Benefit Costs (Credit) [Member]
Changes in accumulated other comprehensive income [Roll Forward]
Beginning balance at Beginning of period	(784)
Other comprehensive income before reclassifications	(375)
Amounts reclassified from accumulated other comprehensive income	(617)
Current period other comprehensive income, net	(992)
Ending balance at End of period	$ (1,776)

[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 Notes 13 and 14 for additional details).