Earnings Per Share (EPS Components) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Summary of earnings per share
Net income	$ 51,845	$ 33,015	$ 117,698	$ 91,688
Weighted Average Shares (in shares)
BASIC SHARES	34,361,176	27,537,841	32,283,196	27,517,210
EFFECT OF DILUTIVE SECURITIES	39,390	63,499	45,416	62,596
DILUTIVE SHARES	34,400,566	27,601,340	32,328,612	27,579,806
NET INCOME PER SHARE (in dollars per share)
BASIC EPS	$ 1.51	$ 1.20	$ 3.65	$ 3.33
EFFECT OF DILUTIVE SECURITIES	0	0	(0.01)	(0.01)
DILUTIVE EPS	$ 1.51	$ 1.20	$ 3.64	$ 3.32