Income Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income per share:
Shares used to calculate basic income per share (in shares)	29,796	29,573
Dilutive effect of outstanding stock options, performance stock units and restricted stock units (in shares)	788	0
Shares used to calculate diluted income per share (in shares)	30,584	29,573
Restricted stock units
Income per share:
Antidilutive securities excluded from computation of earnings per share, weighted average, amount (shares)	0	39
Anti-dilutive securities excluded from computation of diluted income per share (in shares)	160	341
Stock options
Income per share:
Antidilutive securities excluded from computation of earnings per share, weighted average, amount (shares)	0	30
Anti-dilutive securities excluded from computation of diluted income per share (in shares)	48	91