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Derivative Financial Instruments (Narrative) (Details)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
EUR (€)
Dec. 31, 2012
USD ($)
Jun. 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 (€)
Jun. 30, 2014
Cash Flow Hedging [Member]
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
USD ($)
Jun. 30, 2014
Interest Expense [Member]
USD ($)
Jun. 30, 2013
Interest Expense [Member]
USD ($)
Jun. 30, 2014
Interest Expense [Member]
USD ($)
Jun. 30, 2013
Interest Expense [Member]
USD ($)
Jun. 30, 2014
Interest Expense [Member]
Interest Rate Swap [Member]
USD ($)
Jun. 30, 2013
Interest Expense [Member]
Interest Rate Swap [Member]
USD ($)
Jun. 30, 2014
Interest Expense [Member]
Interest Rate Swap [Member]
USD ($)
Jun. 30, 2013
Interest Expense [Member]
Interest Rate Swap [Member]
USD ($)
Jun. 30, 2014
Other Income [Member]
Foreign Exchange Option [Member]
USD ($)
Jun. 30, 2013
Other Income [Member]
Foreign Exchange Option [Member]
USD ($)
Jun. 30, 2014
Other Income [Member]
Foreign Exchange Option [Member]
USD ($)
Jun. 30, 2013
Other Income [Member]
Foreign Exchange Option [Member]
USD ($)
Derivative [Line Items]                                              
Derivative, Total Notional Amount $ 657,875   $ 657,875         $ 200,000   € 125,000 $ 457,875                        
Cash and cash equivalents 283,992 448,637 283,992 448,637 521,951 250,000 610,970                                
Prepaid Expense and Other Assets, Current 57,606   57,606   65,512       2,577                            
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 $ (587) $ 1,431 $ (3,046) $ 1,510                       $ (769) $ 1,431 $ (1,024) $ 1,510 $ 0 $ 0 $ (1,754) $ 0