Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Accumulated deficit	Accumulated other comprehensive income (loss)
Beginning balance at Dec. 31, 2012	$ 140,775	$ 330,024	$ (192,933)	$ 3,684
Beginning balance (In shares) at Dec. 31, 2012		47,326,306
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	47,125		50,845	(3,720)
Issuance of common stock, net (In shares)		68,871
Issuance of common stock, net	30	$ 30
Restricted stock grants, net (In shares)		196,884
Stock-based compensation expense	889	$ 889
Tax effect on nonvested restricted stock	(104)	(104)
Ending balance at Dec. 31, 2013	188,715	$ 330,839	(142,088)	(36)
Ending balance (In shares) at Dec. 31, 2013		47,592,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	6,608		3,737	2,871
Issuance of common stock, net (In shares)		24,454,170
Issuance of common stock, net	119,285	$ 119,285
Restricted stock grants, net (In shares)		445,619
Stock-based compensation expense	1,214	$ 1,214
Tax effect on nonvested restricted stock	(339)	(339)
Ending balance at Dec. 31, 2014	315,483	$ 450,999	(138,351)	2,835
Ending balance (In shares) at Dec. 31, 2014		72,491,850
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	19,365		20,579	(1,214)
Issuance of common stock, net (In shares)		207,266
Issuance of common stock, net	0	$ 0
Restricted stock grants, net (In shares)		93,454
Stock-based compensation expense	2,482	$ 2,482
Tax effect on nonvested restricted stock	(556)	(556)
Ending balance at Dec. 31, 2015	$ 336,774	$ 452,925	$ (117,772)	$ 1,621
Ending balance (In shares) at Dec. 31, 2015		72,792,570