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Summary of Significant Accounting Policies (Earnings Per Share) (Weighted Average Shares Outstanding) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Basic And Diluted Weighted Average Common Shares Outstanding [Line Items]        
Weighted-average common shares outstanding 114,330 111,921 114,000 111,561
Diluted weighted-average common shares outstanding 119,387 117,731 119,037 117,784
Employee Stock Option        
Schedule of Basic And Diluted Weighted Average Common Shares Outstanding [Line Items]        
Dilutive securities 4,376 5,579 4,322 5,922
Restricted stock awards        
Schedule of Basic And Diluted Weighted Average Common Shares Outstanding [Line Items]        
Dilutive securities 163 157 193 261
Performance Shares        
Schedule of Basic And Diluted Weighted Average Common Shares Outstanding [Line Items]        
Dilutive securities 518 74 522 40