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Net Income per Share - Shares and EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income	$ 187,000	$ 133,982	$ 126,633
Basic weighted-average shares outstanding	43,709	44,735	46,213
Dilutive effect of potential common stock equivalents - stock options (in shares)	132	186	327
Diluted weighted-average shares outstanding	43,841	44,921	46,540
Net earnings per share:
Earnings Per Share, Basic	$ 4.28	$ 3.00	$ 2.74
Earnings Per Share, Diluted	$ 4.27	$ 2.98	$ 2.72

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