Derivative Financial Instruments Derivative Instruments Not Designated as Hedges (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Other income, net	$ 1,786,000	$ 853,000	$ 1,589,000	$ 1,852,000
Contingent forward sale contract mark-to-market expense	0	(50,106,000)	0	(50,106,000)
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(155,000)	(51,227,000)	(1,665,000)	(53,460,000)
Not Designated as Hedging Instrument [Member] | Cross-currency swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense, net		(1,051,000)		(3,572,000)
Other income, net	485,000	(70,000)	507,000	218,000
Not Designated as Hedging Instrument [Member] | Contingent forward sale contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Contingent forward sale contract mark-to-market expense	$ 0	$ (50,106,000)	$ 0	$ (50,106,000)