Earnings Per Share (EPS Components) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Summary of earnings per share
Net income	$ 24,902	$ 30,628	$ 51,653	$ 65,853
Weighted Average Shares (in shares)
BASIC SHARES	32,944,761	34,313,492	33,564,596	31,226,985
EFFECT OF DILUTIVE SECURITIES	28,098	41,878	31,991	48,381
DILUTIVE SHARES	32,972,859	34,355,370	33,596,587	31,275,366
NET INCOME PER SHARE (in dollars per share)
BASIC EPS	$ 0.76	$ 0.89	$ 1.54	$ 2.11
EFFECT OF DILUTIVE SECURITIES	0	0	0	0
DILUTIVE EPS	$ 0.76	$ 0.89	$ 1.54	$ 2.11