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Earnings per Share ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic EPS
Net income	$ 157,436	$ 133,932	$ 136,726
Shares (Denominator)	66,046,155	65,967,989	66,411,193
Per Share Amount	$ 2.38	$ 2.03	$ 2.06
Diluted EPS
Net Income	$ 157,436	$ 133,932	$ 136,726
Potential dilutive common shares and warrants	732,281	345,501	225,160
Shares (Denominator)	66,778,436	66,313,490	66,636,353
Per Share Amount (in dollars per share)	$ 2.36	$ 2.02	$ 2.05

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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