Income Taxes - Reconciliation of beginning and ending amount of unrecognized tax benefits (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits balance at beginning of year	$ 2,046,000	$ 17,893,000	$ 18,570,000
Reductions for tax positions of prior years	(503,000)	(15,875,000)	(716,000)
Currency Translation	36,000	28,000	39,000
Unrecognized tax benefits balance at end of year	$ 1,579,000	$ 2,046,000	$ 17,893,000