Quarterly report pursuant to Section 13 or 15(d)

Business and Summary of Significant Accounting Principles (Weighted Average Shares outstanding which are anti-dilutive) (Details)

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Business and Summary of Significant Accounting Principles (Weighted Average Shares outstanding which are anti-dilutive) (Details) - shares
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Class of Stock [Line Items]        
Shares associated with anti-dilutive securities 758 28 631 31
Derivative instruments that may be settled in cash or shares, the effect of which is anti-dilutive        
Class of Stock [Line Items]        
Shares associated with anti-dilutive securities 612 0 486 0
Shares associated with anti-dilutive unexercised stock options        
Class of Stock [Line Items]        
Shares associated with anti-dilutive securities 120 28 119 31
Share-based compensation that may be settled in cash or shares, the effect of which is anti-dilutive        
Class of Stock [Line Items]        
Shares associated with anti-dilutive securities 26 0 26 0