Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Notional amounts of foreign currency forward contracts	$ 91,913	$ 119,008
Swedish Kronor
Notional amounts of foreign currency forward contracts	59,198	67,809
Canadian Dollar
Notional amounts of foreign currency forward contracts	10,799	17,446
British Pound Sterling
Notional amounts of foreign currency forward contracts	10,203	14,928
Brazil, Brazil Real
Notional amounts of foreign currency forward contracts	6,440	2,449
Australian Dollar
Notional amounts of foreign currency forward contracts	2,342	6,566
Euro
Notional amounts of foreign currency forward contracts	281	5,391
Japanese Yen
Notional amounts of foreign currency forward contracts	2,124	3,718
Other
Notional amounts of foreign currency forward contracts	$ 526	$ 701