Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Changes in component of accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	$ (16,527)
Other comprehensive income (loss) before reclassifications	(6,590)
Amounts reclassified from other comprehensive income (loss)	(498)
Net current-period other comprehensive income (loss)	(6,092)
Net current-period other comprehensive income (loss)	(6,288)	1,994
Net current-period other comprehensive income (loss)	(378)	(558)
Net current-period other comprehensive income (loss)	574	127
Balance at the end of the period	(22,619)
Foreign Currency Translation Adjustments
Changes in component of accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	17,098
Other comprehensive income (loss) before reclassifications	(7,320)
Amounts reclassified from other comprehensive income (loss)	(1,032)
Net current-period other comprehensive income (loss)	(6,288)
Balance at the end of the period	10,810
Pension Benefit Adjustments
Changes in component of accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	(33,718)
Other comprehensive income (loss) before reclassifications	181
Pension benefit adjustment amounts reclassified from other comprehensive income (loss), net of tax	(559)
Net current-period other comprehensive income (loss)	(378)
Balance at the end of the period	(34,096)
Derivatives
Changes in component of accumulated other comprehensive loss, net of tax
Balance at the beginning of the period	93
Other comprehensive income (loss) before reclassifications	549
Amounts reclassified from other comprehensive income (loss)	25
Net current-period other comprehensive income (loss)	574
Balance at the end of the period	$ 667