Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	$ (20,151)	$ (22,619)	$ (16,527)
Other comprehensive income (loss) before reclassifications	4,123	719	(6,590)
Amounts reclassified from other comprehensive income (loss)	461	1,749	498
Net current-period other comprehensive income (loss)	4,584	2,468	(6,092)
Balance at the end of the period	(15,567)	(20,151)	(22,619)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	11,580	10,810	17,098
Other comprehensive income (loss) before reclassifications	4,551	2,834	(7,320)
Amounts reclassified from other comprehensive income (loss)		(2,064)	1,032
Net current-period other comprehensive income (loss)	4,551	770	(6,288)
Balance at the end of the period	16,131	11,580	10,810
Pension Benefit Adjustments
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(32,383)	(34,096)	(33,718)
Other comprehensive income (loss) before reclassifications	(184)	(66)	181
Amounts reclassified from other comprehensive income (loss)	608	1,779	(559)
Net current-period other comprehensive income (loss)	424	1,713	(378)
Balance at the end of the period	(31,959)	(32,383)	(34,096)
Derivatives
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	652	667	93
Other comprehensive income (loss) before reclassifications	(244)	15	549
Amounts reclassified from other comprehensive income (loss)	(147)	(30)	25
Net current-period other comprehensive income (loss)	(391)	(15)	574
Balance at the end of the period	$ 261	$ 652	$ 667