LItigation Settlement and Supplemental Operating Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Nonoperating Income (Expense) [Abstract]
Litigation settlement	$ 2,900	$ 0	$ 2,900	$ 0
Other nonoperating income (expense), net		(2,611)	(2,850)	(2,521)
Foreign currency gain (loss)		11	(269)	(379)
Other-than-temporary impairment loss	$ 366		$ 366