Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivative, Notional Amount	$ 136,339	$ 119,008
Swedish kronor
Derivative, Notional Amount	67,537	67,809
Canada, Dollars
Derivative, Notional Amount	21,151	17,446
British pound sterling
Derivative, Notional Amount	26,113	14,928
Euro
Derivative, Notional Amount	8,041	5,391
Brazil, Brazil Real
Derivative, Notional Amount	6,025	2,449
Australian dollar
Derivative, Notional Amount	3,705	6,566
Japanese yen
Derivative, Notional Amount	2,981	3,718
Other
Derivative, Notional Amount	$ 786	$ 701