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Stockholders' Equity and Stock Incentive Plans RSU, PSU and Career Shares (Details) - Common Stock	3 Months Ended
	Mar. 31, 2019 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	395,964
Shares to be issued to settle PSUs	1.67
Stock Issued During Period, Shares, Performance Stock Award, Taxes	125,004
Stock Issued During Period, Shares, Performance Stock Award, Net	270,960
PSU - Nov 2013 [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

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