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Income Per Share (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Document Period End Date Mar. 31, 2019  
Income per share:    
Shares used to calculate basic income per share (in shares) 29,573 30,314 [1]
Dilutive effect of outstanding stock options, performance stock units and restricted stock units (in shares) 0 277
Shares used to calculate diluted income per share (in shares) 29,573 30,591 [1]
Stock options    
Income per share:    
Anti-dilutive securities excluded from computation of diluted income per share (in shares) 91 13
Restricted stock units    
Income per share:    
Anti-dilutive securities excluded from computation of diluted income per share (in shares) 341 1
[1] May not add due to rounding.