Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Earnings
Beginning Balance at Dec. 31, 2017	$ 318,026	$ 44	$ 325,391	$ (143,357)	$ (2,649)	$ 138,597
Beginning balance (in shares) at Dec. 31, 2017		37,532,959
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,646					13,646
Other comprehensive income (loss), net of tax	564				564
Purchase of treasury shares	(14,550)	$ 0		(14,550)
Purchase of treasury shares ( in shares)		(530,600)
Stock option exercise	11	$ 0	11
Stock option exercise (in shares)		781
Share-based compensation	213	$ 0	213
Share-based compensation (in shares)		85,838
Ending Balance at Mar. 31, 2018	317,910	$ 44	325,615	(157,907)	(2,085)	152,243
Ending balance (in shares) at Mar. 31, 2018		37,088,978
Beginning Balance at Dec. 31, 2017	318,026	$ 44	325,391	(143,357)	(2,649)	138,597
Beginning balance (in shares) at Dec. 31, 2017		37,532,959
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,541
Other comprehensive income (loss), net of tax	703
Ending Balance at Jun. 30, 2018	330,911	$ 44	326,594	(167,919)	(1,946)	174,138
Ending balance (in shares) at Jun. 30, 2018		36,748,879
Beginning Balance at Mar. 31, 2018	317,910	$ 44	325,615	(157,907)	(2,085)	152,243
Beginning balance (in shares) at Mar. 31, 2018		37,088,978
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,895					21,895
Other comprehensive income (loss), net of tax	139				139
Purchase of treasury shares	(10,012)	$ 0		(10,012)
Purchase of treasury shares ( in shares)		(344,908)
Stock option exercise	0	$ 0	0
Stock option exercise (in shares)		2,706
Share-based compensation	979	$ 0	979
Share-based compensation (in shares)		2,103
Ending Balance at Jun. 30, 2018	330,911	$ 44	326,594	(167,919)	(1,946)	174,138
Ending balance (in shares) at Jun. 30, 2018		36,748,879
Beginning Balance at Dec. 31, 2018	327,747	$ 44	327,515	(209,050)	(3,391)	212,629
Beginning balance (in shares) at Dec. 31, 2018		35,401,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,926					15,926
Other comprehensive income (loss), net of tax	(54)				(54)
Purchase of treasury shares	(5,005)	$ 0		(5,005)
Purchase of treasury shares ( in shares)		(191,907)
Stock option exercise	118	$ 0	118
Stock option exercise (in shares)		6,500
Share-based compensation	35	$ 0	35
Share-based compensation (in shares)		58,571
Ending Balance at Mar. 31, 2019	338,767	$ 44	327,668	(214,055)	(3,445)	228,555
Ending balance (in shares) at Mar. 31, 2019		35,275,032
Beginning Balance at Dec. 31, 2018	327,747	$ 44	327,515	(209,050)	(3,391)	212,629
Beginning balance (in shares) at Dec. 31, 2018		35,401,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,774
Other comprehensive income (loss), net of tax	(1,411)
Ending Balance at Jun. 30, 2019	335,788	$ 44	328,216	(229,073)	(4,802)	241,403
Ending balance (in shares) at Jun. 30, 2019		34,688,206
Beginning Balance at Mar. 31, 2019	338,767	$ 44	327,668	(214,055)	(3,445)	228,555
Beginning balance (in shares) at Mar. 31, 2019		35,275,032
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,848					12,848
Other comprehensive income (loss), net of tax	(1,357)				(1,357)
Purchase of treasury shares	(15,018)	$ 0		(15,018)
Purchase of treasury shares ( in shares)		(589,300)
Stock option exercise	0	$ 0	0
Stock option exercise (in shares)		0
Share-based compensation	548	$ 0	548
Share-based compensation (in shares)		2,474
Ending Balance at Jun. 30, 2019	$ 335,788	$ 44	$ 328,216	$ (229,073)	$ (4,802)	$ 241,403
Ending balance (in shares) at Jun. 30, 2019		34,688,206

Continental Building Products, Inc. 10-Q