Derivative Instruments, Foreign Exchange Contracts (Details) (Foreign Exchange Contract [Member])	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014 Canada, Dollars CAD	Dec. 31, 2013 Canada, Dollars CAD	Sep. 30, 2014 Japan, Yen JPY (¥)	Dec. 31, 2013 Japan, Yen JPY (¥)	Sep. 30, 2014 United Kingdom, Pounds GBP (£)	Dec. 31, 2013 United Kingdom, Pounds GBP (£)	Sep. 30, 2014 Euro Member Countries, Euro EUR (€)	Dec. 31, 2013 Euro Member Countries, Euro EUR (€)
Derivative [Line Items]
Derivative, Maturity Date	Jun. 01, 2016
Foreign exchange contract outstanding		34,000	0.0	¥ 0	¥ 10,100,000	£ 106,000	£ 237,000	€ 1,500,000	€ 13,300,000