Accumulated Other Comprehensive (Loss) Income - Summary of components of accumulated other comprehensive (loss) income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (14,246)		$ (12,646)
Change during the period
Before-tax amount	6,168		(3,424)
Tax benefit	(2,535)		1,400
Reclassification adjustment, net of taxes:
Amortization of net loss	498	[1]	424	[1]
Total activity in period	4,131		(1,600)
Balance	(10,115)		(14,246)
Pension Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(14,688)		(12,981)
Change during the period
Before-tax amount	6,976		(3,355)
Tax benefit	(2,546)		1,224
Reclassification adjustment, net of taxes:
Amortization of net loss	498	[1]	424	[1]
Total activity in period	4,928		(1,707)
Balance	(9,760)		(14,688)
Unrealized Gain (Loss) On Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	29		187
Change during the period
Before-tax amount	(30)		(249)
Tax benefit	11		91
Reclassification adjustment, net of taxes:
Amortization of net loss		[1]		[1]
Total activity in period	(19)		(158)
Balance	10		29
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	413		148
Change during the period
Before-tax amount	(778)		180
Tax benefit			85
Reclassification adjustment, net of taxes:
Amortization of net loss		[1]		[1]
Total activity in period	(778)		265
Balance	$ (365)		$ 413

[1] Reported as part of selling, general and administrative expenses.