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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator
Net income available to common stockholders (in US dollars)	$ 75,665	$ 72,410
Denominator
Weighted average shares outstanding used to compute basic earnings per common share (in shares)	56,007,122	56,168,356
Effect of dilutive securities-Share-based awards (in shares)	203,606	255,866
Shares used to compute diluted earnings per common share (in shares)	56,210,728	56,424,222
Basic earnings per common share (in US dollars per share)	$ 1.35	$ 1.29
Diluted earnings per common share (in US dollars per share)	$ 1.35	$ 1.28
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive share-based awards excluded from calculation of diluted earnings per share (in shares)	95,084	2,150

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