Earnings Per Share (EPS Components) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Summary of earnings per share
Net income	$ 30,628	$ 35,225	$ 31,118	$ 27,555	$ 65,853	$ 58,673
Weighted Average Shares (in shares)
BASIC SHARES	34,313,492		27,526,653		31,226,985	27,506,724
EFFECT OF DILUTIVE SECURITIES	41,878		54,525		48,381	61,480
DILUTIVE SHARES	34,355,370		27,581,178		31,275,366	27,568,204
NET INCOME PER SHARE (in dollars per share)
BASIC EPS	$ 0.89		$ 1.13		$ 2.11	$ 2.13
EFFECT OF DILUTIVE SECURITIES	0		0		0	0
DILUTIVE EPS	$ 0.89		$ 1.13		$ 2.11	$ 2.13