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Convertible Senior Notes Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Jun. 30, 2015
Nov. 14, 2014
Nov. 30, 2005
May. 31, 2005
3.625% Convertible Senior Notes Due 2025 [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount   $ 450,000 $ 0     $ 250,000,000.0
Interest rate on notes           3.625%
5.875% Convertible Senior Notes Due 2035 [Member]            
Debt Instrument [Line Items]            
Aggregate principal amount   93,280,000 $ 93,280,000   $ 300,000,000.0  
Interest rate on notes         5.875% 5.875%
Tender Offer Repurchase Amount - Face Value 80000          
Conversion price for convertible senior notes (in dollars per share)     $ 24.61      
Tender Offer Repurchase Amount 25200          
Debt Instrument, Repurchased Face Amount       $ 46,100,000    
Debt Instrument, Repurchase Amount       $ 19,100,000    
Gains (Losses) on Extinguishment of Debt   $ 12,100,000