Derivative Instruments, Foreign Exchange Contracts (Details) (Foreign Exchange Contract [Member]) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015 United Kingdom, Pounds GBP (£)	Dec. 31, 2014 United Kingdom, Pounds GBP (£)	Mar. 31, 2015 Euro Member Countries, Euro EUR (€)	Dec. 31, 2014 Euro Member Countries, Euro EUR (€)	Mar. 31, 2015 Australia, Dollars AUD	Dec. 31, 2014 Australia, Dollars AUD	Dec. 31, 2014 Malaysia, Ringgits MYR
Derivative [Line Items]
Derivative, Maturity Date	Dec. 01, 2016
Foreign exchange contract outstanding		£ 263	£ 300	€ 2,200	€ 1,400	667	800	500