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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic
Net income applicable to common stock	$ 26,421	$ 23,179	$ 75,677	$ 67,295
Average common shares outstanding (shares)	49,316,572	42,091,164	46,050,250	41,500,407
Net income per common share - basic (usd per share)	$ 0.54	$ 0.55	$ 1.64	$ 1.62
Diluted
Net income applicable to common stock	$ 26,421	$ 23,179	$ 75,677	$ 67,295
Average common shares outstanding (shares)	49,316,572	42,091,164	46,050,250	41,500,407
Effect of dilutive stock-based compensation (shares)	118,653	219,194	117,891	229,501
Average common shares outstanding - diluted	49,435,225	42,310,358	46,168,141	41,729,908
Net income per common share - diluted (usd per share)	$ 0.53	$ 0.55	$ 1.64	$ 1.61

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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