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2.25% Convertible Senior Notes Due 2019 (Additional Information) (Details)
6 Months Ended
Jun. 30, 2014
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
item
$ / shares
Jun. 30, 2014
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Debt Instrument, convertible maturity start date   Jan. 01, 2019    
Net proceeds from issuance of convertible debt     $ 330,000,000  
Payment for capped call transactions     19,668,000  
Net of deferred income tax effect amounts   $ 7,736,000 (8,672,000)  
Minimum [Member]        
Debt Instrument [Line Items]        
Percentage of debt conversion price   130.00%    
2.25% Convertible Senior Notes Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt instrument, aggregate principal amount $ 330,000,000 $ 330,000,000 $ 330,000,000 $ 330,000,000
Debt instrument, interest rate 2.25%   2.25%  
Debt instrument, maturity end date Jul. 01, 2019      
Initial conversion rate 7.9353%      
Debt conversion price per share of common stock | $ / shares $ 126.02   $ 126.02  
Proceeds from issuance of convertible debt, net of transaction cost $ 322,000,000      
Debt Conversion, Converted Instrument, Amount $ 1,000      
Net carrying amount   283,015,000    
Carrying value of the permanent equity component reported in additional paid-in-capital   $ 46,985,000    
Effective interest rate after allocation of transaction costs   6.10%    
Cash flows, discount rate   5.55%    
Deferred tax liabilities, convertible notes   $ 16,445,000    
2.25% Convertible Senior Notes Due 2019 [Member] | Capped Call Transactions [Member]        
Debt Instrument [Line Items]        
Net proceeds from issuance of convertible debt   321,732,000    
Transaction costs   $ 8,268,000    
Payment for capped call transactions     $ 19,668,000  
Strike price, per share | $ / shares   $ 126.02    
Approximate cap price, per share | $ / shares   $ 155.78    
Net of deferred income tax effect amounts   $ 12,784,000    
2.25% Convertible Senior Notes Due 2019 [Member] | 2.25 % Convertible Senior Notes Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt instrument, convertible trading days | item   20    
Debt instrument, convertible consecutive trading days   30 days    
Measurement Period [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Percentage of debt conversion price   98.00%