Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule of Stock-based Awards Granted) (Details)

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Stock-Based Compensation (Schedule of Stock-based Awards Granted) (Details) - 2007 Stock Incentive Plan - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 540,500 10,000   540,500 135,000
Restricted stock awards and restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity instruments other than options, granted (in shares) 180,000 150,000   180,000 212,500
Performance stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity instruments other than options, granted (in shares) 0 0 166,149 0