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Earnings Per Share (EPS Components) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Summary of earnings per share
Net income	$ 20,484	$ 18,594	$ 59,469	$ 45,505
Weighted Average Shares (in shares)
BASIC SHARES	26,324,316	26,200,621	26,301,340	25,774,571
EFFECT OF DILUTIVE SECURITIES	53,072	63,493	48,354	72,921
DILUTIVE SHARES	26,377,388	26,264,114	26,349,694	25,847,492
NET INCOME PER SHARE (in dollars per share)
BASIC EPS	$ 0.78	$ 0.71	$ 2.26	$ 1.77
EFFECT OF DILUTIVE SECURITIES	0.00	0.00	0.00	(0.01)
DILUTIVE EPS	$ 0.78	$ 0.71	$ 2.26	$ 1.76

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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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