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
Accumulated other comprehensive loss, tax
Accumulated other comprehensive loss at the beginning of the period			$ 19,392
Amounts reclassified from accumulated other comprehensive loss			86
Current-period other comprehensive income (loss) activity			583
Accumulated other comprehensive loss at the end of the period	20,061		20,061
Accumulated other comprehensive loss, net of tax
Accumulated other comprehensive loss at the beginning of the period			(29,688)
Amounts reclassified from accumulated other comprehensive loss	(49)	(167)	(132)	(333)
Current-period other comprehensive income (loss) activity			(889)
Accumulated other comprehensive loss at the end of the period	(30,709)		(30,709)
Cumulative Translation Adjustment
Accumulated other comprehensive loss, before tax
Accumulated other comprehensive loss at the beginning of the period			338
Current-period other comprehensive income (loss) activity			(1,447)
Accumulated other comprehensive loss at the end of the period	(1,109)		(1,109)
Cash Flow Hedges
Accumulated other comprehensive loss, before tax
Accumulated other comprehensive loss at the beginning of the period			(828)
Amounts reclassified from accumulated other comprehensive loss			170
Current-period other comprehensive income (loss) activity			(25)
Accumulated other comprehensive loss at the end of the period	(683)		(683)
Defined Benefit Plans
Accumulated other comprehensive loss, before tax
Accumulated other comprehensive loss at the beginning of the period			(48,590)
Amounts reclassified from accumulated other comprehensive loss			(388)
Accumulated other comprehensive loss at the end of the period	$ (48,978)		$ (48,978)