Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2018
Income per share
Strike price of the warrant transactions (in dollars per share)	$ 80.91
Numerator, dollars in thousands:
Net earnings	$ 53,424	$ 126,950	$ 113,056
Denominator:
Weighted average shares outstanding, basic (in shares)	53,099,330	52,615,269	52,412,181
Effect of dilutive securities:
Stock options, RSUs, and SARs (in shares)	1,257,414	1,074,474	1,404,573
Weighted average shares outstanding, diluted (in shares)	54,356,744	53,689,743	53,816,754
Earnings per share, basic (in dollars per share)	$ 1.01	$ 2.41	$ 2.16
Earnings per share, diluted (in dollars per share)	$ 0.98	$ 2.36	$ 2.10
Stock options, RSUs, PSUs
Income per share
Common stock equivalents excluded in the calculation of diluted income per share (in shares)	1,275,114	2,888,785	1,145,446
Convertible Debt
Income per share
Conversion price (in dollars per share)				$ 59.33