Derivative Financial Instruments Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivative, Notional Amount	$ 143,710	$ 121,930
Swedish kronor
Derivative, Notional Amount	93,558	99,214
British pound sterling
Derivative, Notional Amount	10,094	5,641
Australian dollar
Derivative, Notional Amount	4,422	5,986
Japanese yen
Derivative, Notional Amount	3,387	4,462
Euro
Derivative, Notional Amount	12,057	265
Canada, Dollars
Derivative, Notional Amount	15,933	2,914
Other
Derivative, Notional Amount	$ 4,259	$ 3,448