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Net Income Per Common Share - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic
Net income applicable to common stock	$ 23,972	$ 21,216
Average common shares outstanding (shares)	44,364,337	40,324,475
Net income per common share - basic (usd per share)	$ 0.54	$ 0.53
Diluted
Net income applicable to common stock	$ 23,972	$ 21,216
Average common shares outstanding (shares)	44,364,337	40,324,475
Effect of dilutive stock-based compensation (shares)	116,162	234,670
Average common shares outstanding - diluted (shares)	44,480,499	40,559,145
Net income per common share - diluted (usd per share)	$ 0.54	$ 0.52

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- 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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