CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Stock [Member] Restricted Stock [Member]	Common Stock [Member] Restricted Stock Units (RSUs) [Member]	Common Stock [Member]	Retained Earnings / (Accumulated deficit) [Member]	Accumulated Other Comprehensive Loss [Member]	Restricted Stock [Member]	Restricted Stock Units (RSUs) [Member]	Total
Balance, beginning at Dec. 31, 2018			$ 1,309,269	$ (269,485)	$ (29,929)			$ 1,009,855
Net income				10,897				10,897
Other comprehensive loss					(3,377)			(3,377)
Forfeitures of vested restricted stock awards			(149)					(149)
Compensation relating to restricted stock units or restricted stock awards			233					233
Compensation relating to stock option awards	$ 232	$ 296				$ 232	$ 296
Balance, ending at Mar. 31, 2019			1,309,881	(258,588)	(33,306)			1,017,987
Balance, beginning at Dec. 31, 2019			1,313,178	(270,315)	(20,570)			1,022,293
Net income				33,019				33,019
Other comprehensive loss					(14,392)			(14,392)
Dividends declared and paid			(1,729)					(1,729)
Forfeitures of vested restricted stock awards			(705)					(705)
Compensation relating to restricted stock units or restricted stock awards			222					222
Compensation relating to stock option awards	$ 229	$ 755				$ 229	$ 755
Repurchase of common stock			(10,012)					(10,012)
Balance, ending at Mar. 31, 2020			$ 1,301,938	$ (237,296)	$ (34,962)			$ 1,029,680