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Stockholders' Equity and Stock Incentive Plans RSU, PSU and Career Shares (Details) - Common Stock | 6 Months Ended
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Jun. 30, 2018 shares
PSU - Dec 2014 [Domain] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Issued During Period, Shares, Performance Stock Award, Gross | 486,805
Shares to be issued to settle PSUs | 1.57
Stock Issued During Period, Shares, Performance Stock Award, Taxes | 149,268
Stock Issued During Period, Shares, Performance Stock Award, Net | 337,537
PSU - Nov 2013 [Domain] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Stock Issued During Period, Shares, Performance Stock Award, Gross | 268,429
Shares to be issued to settle PSUs | 0.80
Stock Issued During Period, Shares, Performance Stock Award, Taxes | 94,776
Stock Issued During Period, Shares, Performance Stock Award, Net | 173,653

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