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Long-Term Debt (Details 5)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 6 Months Ended
Sep. 30, 2014
Jun. 30, 2014
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
Jun. 30, 2009
USD ($)
Long-Term Debt        
Value of shares acquired upon exercise of call options     $ 89,407  
4.25% convertible senior notes due June 2014        
Long-Term Debt        
Principle amount of senior notes       $ 355,000
Interest rate (as a percent)   4.25% 4.25% 4.25%
Conversion rate of debt instrument (Shares per USD)   0.0435084    
Conversion price per common stock shares (in dollars per share) | $ / shares   $ 22.98 $ 22.98  
Repayment of long term debt   $ 370,000    
Number of shares of common stock issued upon redemption of debt | shares   6.8    
Price per share of common stock for call options purchased (in dollars per share) | $ / shares   $ 22.98 22.98  
Warrant exercise price (in dollars per share) | $ / shares   32.19 32.19  
Effective conversion price (in dollars per share) | $ / shares   $ 32.19 $ 32.19  
Debt instrument face amount for effective conversion price   $ 325,000 $ 325,000  
Number of shares acquired upon exercise of call options | shares   6.5    
Value of shares acquired upon exercise of call options   $ 89,400    
Trading days within which counterparties have the right to exercise warrants 80 days