Earnings Per Share (EPS Components) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Summary of earnings per share
Net income	$ 17,451	$ 14,746	$ 26,910	$ 28,129
Weighted Average Shares (in shares)
BASIC SHARES	26,149,593	23,897,413	25,558,016	23,858,456
EFFECT OF DILUTIVE SECURITIES	71,819	94,560	76,626	97,544
DILUTIVE SHARES	26,221,412	23,991,973	25,634,642	23,956,000
NET INCOME PER SHARE (in dollars per share)
BASIC EPS	$ 0.67	$ 0.62	$ 1.05	$ 1.18
EFFECT OF DILUTIVE SECURITIES	0.00	(0.01)	0.00	(0.01)
DILUTIVE EPS	$ 0.67	$ 0.61	$ 1.05	$ 1.17