Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	$ (16,527)
Other comprehensive income (loss) before reclassifications	(3,807)
Amounts reclassified from other comprehensive income (loss)	183
Net current-period other comprehensive income (loss)	(3,624)
Balance at the end of the period	(20,151)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	17,098
Other comprehensive income (loss) before reclassifications	(4,486)
Amounts reclassified from other comprehensive income (loss)	(1,032)
Net current-period other comprehensive income (loss)	(5,518)
Balance at the end of the period	11,580
Pension Benefit Adjustments
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	(33,718)
Other comprehensive income (loss) before reclassifications	115
Amounts reclassified from other comprehensive income (loss)	1,220
Net current-period other comprehensive income (loss)	1,335
Balance at the end of the period	(32,383)
Derivatives
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	93
Other comprehensive income (loss) before reclassifications	564
Amounts reclassified from other comprehensive income (loss)	(5)
Net current-period other comprehensive income (loss)	559
Balance at the end of the period	$ 652