Other (Income) Expense Foreign Currency Gain Loss by Currency (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Foreign Currency Transaction Gain (Loss), before Tax	$ 142	$ 1,800	$ 1,032
Argentine Peso [Member]
Foreign Currency Transaction Gain (Loss), before Tax	147	113	17
AustralianDollar [Member]
Foreign Currency Transaction Gain (Loss), before Tax	30	81	(135)
Angolan Kwanza [Member]
Foreign Currency Transaction Gain (Loss), before Tax	41	257	(58)
British Pound [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(41)	163	390
Canadian Dollar [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(415)	423	(711)
Euro [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(62)	257	1,788
Malaysian Ringgit [Member]
Foreign Currency Transaction Gain (Loss), before Tax	70	187	(157)
Nigerian Naira [Member]
Foreign Currency Transaction Gain (Loss), before Tax	11	164	98
Venezuelan Bolivar [Member]
Foreign Currency Transaction Gain (Loss), before Tax	7	(108)	(267)
Other Currencies Net [Member]
Foreign Currency Transaction Gain (Loss), before Tax	$ 354	$ 263	$ 67