Equity and Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 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	(4,252)	(1,475)
Amounts reclassified from accumulated other comprehensive income (loss)	142	53
Total other comprehensive loss	(4,110)	(1,422)
Accumulated other comprehensive (loss) income, ending balance	7,131	9,427
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	0	1,294
Amounts reclassified from accumulated other comprehensive income (loss)	142	53
Total other comprehensive loss	142	1,347
Accumulated other comprehensive (loss) income, ending balance	(5,231)	(9,163)
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	(4,252)	(2,769)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive loss	(4,252)	(2,769)
Accumulated other comprehensive (loss) income, ending balance	$ 12,362	$ 18,590