Derivative Financial Instruments Effect of Derivative Instruments Not Designated as Hedges (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Other income, net		$ 2,122,000	$ 2,182,000	$ 703,000
Contingent forward sale contract mark-to-market expense	(50,100,000)	0	(50,106,000)	0
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedges		(2,269,000)	(54,441,000)	(5,689,000)
Fair Value, Inputs, Level 1 [Member] | 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
Cross-currency swap agreement [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest (expense)/income		(2,696,000)	(4,638,000)	(5,935,000)
Other income, net		$ 427,000	$ 303,000	$ 246,000