Derivative Financial Instruments (Narrative) (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended									3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 EUR (€)	Dec. 31, 2012 USD ($)	Sep. 30, 2014 Interest Rate Swap [Member] Not Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Option [Member] USD ($)	Dec. 31, 2013 Foreign Exchange Option [Member] EUR (€)	Sep. 30, 2014 Cash Flow Hedging [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($)	Sep. 30, 2014 Interest Expense [Member] USD ($)	Sep. 30, 2013 Interest Expense [Member] USD ($)	Sep. 30, 2014 Interest Expense [Member] USD ($)	Sep. 30, 2013 Interest Expense [Member] USD ($)	Sep. 30, 2014 Interest Expense [Member] Interest Rate Swap [Member] USD ($)	Sep. 30, 2013 Interest Expense [Member] Interest Rate Swap [Member] USD ($)	Sep. 30, 2014 Interest Expense [Member] Interest Rate Swap [Member] USD ($)	Sep. 30, 2013 Interest Expense [Member] Interest Rate Swap [Member] USD ($)	Sep. 30, 2014 Other Income [Member] Foreign Exchange Option [Member] USD ($)	Sep. 30, 2013 Other Income [Member] Foreign Exchange Option [Member] USD ($)	Sep. 30, 2014 Other Income [Member] Foreign Exchange Option [Member] USD ($)	Sep. 30, 2013 Other Income [Member] Foreign Exchange Option [Member] USD ($)
Derivative [Line Items]
Cash and cash equivalents	$ 296,622	$ 509,676	$ 296,622	$ 509,676	$ 521,951	€ 250,000	$ 610,970
Prepaid Expense and Other Assets, Current	69,688		69,688		65,512				2,577
Derivative, Notional Amount	551,094		551,094					200,000		125,000	351,094
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net												0	0	0	0
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net												0	0	0	0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 930	$ (847)	$ (2,116)	$ 663												$ 247	$ (847)	$ (777)	$ 663	$ 0	$ 0	$ (1,754)	$ 0