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Long-Term Debt (Details) (USD $)
1 Months Ended
Jun. 30, 2013
New senior unsecured revolving credit facility [Member]
Apr. 30, 2013
New senior unsecured revolving credit facility [Member]
Jun. 30, 2013
Senior Notes [Member]
Senior Convertible [Member]
Jul. 31, 2013
Senior Notes [Member]
Subsequent Event [Member]
Senior Convertible [Member]
Jul. 02, 2013
Senior Notes [Member]
Subsequent Event [Member]
Senior Convertible [Member]
Long-term debt          
Maximum borrowing capacity   $ 1,250,000,000      
Remaining term loan balance 100,000,000        
Debt repurchased     $ 53,400,000   $ 26,100,000
Interest rate     3.95%    
Conversion ratio       0.0079586