Other (Income) Expense, Net (Foreign Currency (Gain ) Loss by Currency) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Foreign exchange	$ 220	$ 2,612	$ 1,432	$ 4,454
Angola, Kwanza
Foreign exchange	(32)	311	473	819
British Pound [Member]
Foreign exchange	39	173	514	285
Canadian Dollar [Member]
Foreign exchange	(6)	549	(54)	1,772
Euro [Member]
Foreign exchange	45	615	215	(145)
Nigeria, Nairas
Foreign exchange	273	238	431	557
Indonesian Rupiah [Member]
Foreign exchange	(56)	219	(168)	381
Malaysia, Ringgits
Foreign exchange	25	361	22	533
Other Currencies Net [Member]
Foreign exchange	$ (68)	$ 146	$ (1)	$ 252