Equity and Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance			$ 11,241	$ 10,849
Other comprehensive income (loss) before reclassifications			(4,692)	1,398
Amounts reclassified from accumulated other comprehensive (loss) income			291	308
Total other comprehensive income (loss)	2,533	1,433	(4,401)	1,706
Accumulated other comprehensive (loss) income, ending balance	6,840	12,555	6,840	12,555
Defined Benefit Pension [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance			(5,373)	(10,510)
Other comprehensive income (loss) before reclassifications			4,120	1,294
Amounts reclassified from accumulated other comprehensive (loss) income			291	308
Total other comprehensive income (loss)			4,411	1,602
Accumulated other comprehensive (loss) income, ending balance	(962)	(8,908)	(962)	(8,908)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance			16,614	21,359
Other comprehensive income (loss) before reclassifications			(8,812)	104
Amounts reclassified from accumulated other comprehensive (loss) income			0	0
Total other comprehensive income (loss)			(8,812)	104
Accumulated other comprehensive (loss) income, ending balance	$ 7,802	$ 21,463	$ 7,802	$ 21,463