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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic
Net income applicable to common stock	$ 46,625	$ 45,110	$ 36,710	$ 33,826	$ 91,735	$ 70,536
Average common shares outstanding (shares)	58,461,024		49,413,754		58,523,007	49,385,244
Net income per common share - basic (usd per share)	$ 0.80		$ 0.74		$ 1.57	$ 1.43
Diluted
Net income applicable to common stock	$ 46,625	$ 45,110	$ 36,710	$ 33,826	$ 91,735	$ 70,536
Average common shares outstanding (shares)	58,461,024		49,413,754		58,523,007	49,385,244
Effect of dilutive stock-based compensation (shares)	157,952		136,007		146,049	136,801
Average common shares outstanding - diluted (shares)	58,618,976		49,549,761		58,669,056	49,522,045
Net income per common share - diluted (usd per share)	$ 0.80		$ 0.74		$ 1.56	$ 1.42

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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