Other (Income) Expense, Net (Foreign Currency (Gain ) Loss by Currency) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Foreign exchange	$ 433	$ 1,002	$ 1,212	$ 1,842
Angola, Kwanza
Foreign exchange	43	372	505	508
British Pound [Member]
Foreign exchange	247	(262)	475	112
Canadian Dollar [Member]
Foreign exchange	(47)	(51)	(48)	1,223
Euro [Member]
Foreign exchange	(40)	295	170	(760)
Nigeria, Nairas
Foreign exchange	148	180	158	319
Other Currencies Net [Member]
Foreign exchange	$ 82	$ 468	$ (48)	$ 440