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Net Income per Share - Shares and EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income									$ 133,982	$ 126,633	$ 92,617
Basic weighted-average shares outstanding									44,735	46,213	47,486
Dilutive effect of potential common stock equivalents - stock options (in shares)									186	327	288
Diluted weighted-average shares outstanding									44,921	46,540	47,774
Net earnings per share:
Basic	$ 0.63	$ 0.98	$ 0.89	$ 0.50	$ 0.28	$ 0.96	$ 0.95	$ 0.55	$ 3.00	$ 2.74	$ 1.95
Diluted	$ 0.63	$ 0.97	$ 0.88	$ 0.50	$ 0.28	$ 0.95	$ 0.94	$ 0.54	$ 2.98	$ 2.72	$ 1.94

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