Other (Income) Expense Foreign Currency Gain Loss by Currency (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Foreign Currency Transaction Gain (Loss), before Tax		$ 1,800	$ 1,032	$ (331)
AustralianDollar [Member]
Foreign Currency Transaction Gain (Loss), before Tax		81	(135)	(438)
Angolan Kwanza [Member]
Foreign Currency Transaction Gain (Loss), before Tax		257	(58)	20
British Pound [Member]
Foreign Currency Transaction Gain (Loss), before Tax		163	390	(106)
Canadian Dollar [Member]
Foreign Currency Transaction Gain (Loss), before Tax		423	(711)	(1,686)
Colombian Peso [Member]
Foreign Currency Transaction Gain (Loss), before Tax		120	11	(152)
Euro [Member]
Foreign Currency Transaction Gain (Loss), before Tax		257	1,788	(81)
Malaysian Ringgit [Member]
Foreign Currency Transaction Gain (Loss), before Tax		187	(157)	69
Nigerian Naira [Member]
Foreign Currency Transaction Gain (Loss), before Tax		164	98	168
Russian Ruble [Member]
Foreign Currency Transaction Gain (Loss), before Tax		(127)	(6)	421
Venezuelan Bolivar [Member]
Foreign Currency Transaction Gain (Loss), before Tax	1,300	(108)	(267)	1,335
Other Currencies Net [Member]
Foreign Currency Transaction Gain (Loss), before Tax		$ 383	$ 79	$ 119