Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Loss
Balance, beginning of year, net of tax	$ (16,527)	$ (13,517)
Other comprehensive income before reclassifications	14,329
Amounts reclassified from other comprehensive income (loss)	1,058
Net current period other comprehensive income (loss)	15,387	(3,010)	(9,443)
Balance, end of year, net of tax	(1,140)	(16,527)	(13,517)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Balance, beginning of year, net of tax	17,098
Other comprehensive income before reclassifications	727
Amounts reclassified from other comprehensive income (loss)	(1,032)
Net current period other comprehensive income (loss)	(305)
Balance, end of year, net of tax	16,793
Pension Benefit Adjustments
Accumulated Other Comprehensive Loss
Balance, beginning of year, net of tax	(33,718)
Other comprehensive income before reclassifications	12,913
Amounts reclassified from other comprehensive income (loss)	2,355
Net current period other comprehensive income (loss)	15,268
Balance, end of year, net of tax	(18,450)
Derivatives
Accumulated Other Comprehensive Loss
Balance, beginning of year, net of tax	93
Other comprehensive income before reclassifications	689
Amounts reclassified from other comprehensive income (loss)	(265)
Net current period other comprehensive income (loss)	424
Balance, end of year, net of tax	$ 517