Earnings Per Share (EPS Components) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Summary of earnings per share
Net income	$ 20,374	$ 17,451	$ 38,985	$ 26,910
Weighted Average Shares (in shares)
BASIC SHARES	26,304,129	26,149,593.000	26,289,726	25,558,016
EFFECT OF DILUTIVE SECURITIES	47,885	71,819.000	45,679	76,626
DILUTIVE SHARES	26,352,014	26,221,412	26,335,405	25,634,642
NET INCOME PER SHARE (in dollars per share)
BASIC EPS	$ 0.77	$ 0.67	$ 1.48	$ 1.05
EFFECT OF DILUTIVE SECURITIES	0.00	0.00	0.00	0.00
DILUTIVE EPS	$ 0.77	$ 0.67	$ 1.48	$ 1.05