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Derivatives and Hedging (Narrative) (Details)
$ in Thousands, € in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
derivative
Dec. 31, 2014
USD ($)
Dec. 31, 2015
EUR (€)
derivative
Derivative [Line Items]          
Derivative gains (losses) expected to eb reclassified during the next 12 months   $ (7,600)      
Payments for call options   0 $ 0 $ 105,170  
Proceeds from issuance of warrants $ 68,900 0 0 68,900  
Fair values included in other assets   5,386 3,758    
Undesignated derivative instruments          
Derivative [Line Items]          
Derivative liability fair value   193,635 171,476    
Derivative asset fair value   188,904 170,430    
Accrued liabilities          
Derivative [Line Items]          
Derivative liability fair value   7,000 7,800    
Fair values included in other liabilities   6,100 500    
Prepaid and other assets          
Derivative [Line Items]          
Derivative asset fair value   1,200      
Fair values included in other assets   3,200 1,400    
Call option          
Derivative [Line Items]          
Payments for call options       105,200  
Call option | Other Income (Expense)          
Derivative [Line Items]          
Gain on change in fair value   16,700 21,300    
Call option | Other noncurrent assets          
Derivative [Line Items]          
Derivative asset fair value   185,800 169,000    
Call spread overlay          
Derivative [Line Items]          
Net of cash outlay       36,300  
Call spread overlay | Undesignated derivative instruments          
Derivative [Line Items]          
Derivative liability fair value   187,546 170,951    
Derivative asset fair value   185,750 169,037    
Cash conversion option          
Derivative [Line Items]          
Derivative liability fair value   187,500 171,000    
Cash conversion option | Other Income (Expense)          
Derivative [Line Items]          
Loss on change in fair value   16,600 21,500    
Foreign exchange contracts | Undesignated derivative instruments          
Derivative [Line Items]          
Derivative liability fair value   6,089 525    
Derivative asset fair value   3,154 1,393    
Derivative notional amount   347,600 $ 264,200    
Derivative Contracts 2015 | Interest rate swap          
Derivative [Line Items]          
Number of cross currency interest derivatives | derivative     5   5
Derivative asset notional amount | €         € 180.0
Derivative Contracts 2015 | Interest rate swap | Accrued liabilities          
Derivative [Line Items]          
Derivative asset fair value     $ 5,300    
Derivative Contracts 2015 | Interest rate swap | Other noncurrent assets          
Derivative [Line Items]          
Derivative asset fair value   1,400      
Derivative accrued and unpaid interest   1,700 1,600    
Derivative Contracts 2014 | Interest rate swap          
Derivative [Line Items]          
Derivative asset notional amount       $ 200,000  
Derivative Contracts 2014 | Interest rate swap | Accrued liabilities          
Derivative [Line Items]          
Derivative asset fair value     5,000    
Derivative Contracts 2014 | Interest rate swap | Other noncurrent assets          
Derivative [Line Items]          
Derivative asset fair value   3,100      
Derivative accrued and unpaid interest   $ 600 $ 800