CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Treasury Stock [Member]
Balance at Mar. 31, 2017	$ 426,808	$ 1,820	$ 74,701	$ 431,195	$ (10,793)	$ (70,115)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,352	0	0	8,352	0	0
Other comprehensive income (loss)	5,229	0	0	0	5,229	0
Omnibus Equity Incentive Plan	177	1	176	0	0	0
Dividends, Common Stock, Cash	(6,112)			(6,112)
Balance at Jun. 30, 2017	434,454	1,821	74,877	433,435	(5,564)	(70,115)
Balance at Dec. 31, 2017	413,569
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,214
Payments for Repurchase of Common Stock	(391)
Balance at Jun. 30, 2018	419,695	1,823	75,995	440,605	(28,889)	(69,839)
Balance at Mar. 31, 2018	414,900	1,823	75,810	431,594	(24,488)	(69,839)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,261	0	0	15,261	0	0
Other comprehensive income (loss)	(4,401)	0	0	0	(4,401)	0
Omnibus Equity Incentive Plan	185	0	185	0	0	0
Dividends, Common Stock, Cash	(6,250)			(6,250)
Balance at Jun. 30, 2018	$ 419,695	$ 1,823	$ 75,995	$ 440,605	$ (28,889)	$ (69,839)