Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Narrative (Details)

v3.7.0.1
Stock-Based Compensation Narrative (Details) - 2007 Stock Incentive Plan - shares
3 Months Ended 6 Months Ended
May 12, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 500,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   2,730,320   2,730,320  
Performance stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   0 0 166,149 0