Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent
Beginning balance (in shares) at Dec. 31, 2017		27,572
Beginning balance at Dec. 31, 2017	$ 486,104	$ 275	$ 292,494	$ 211,080	$ (17,745)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(30,494)			(30,494)
Cash dividends declared	(3,884)			(3,884)
Share-based compensation expense (in shares)		165
Share-based compensation expense	2,334	$ 2	2,332
Shares issued for option exercises (in shares)		27
Shares issued for option exercises	274		274
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(35)
Restricted shares and performance shares forgiven for taxes and forfeited	(720)		(720)
Change in fair value of interest rate swap, net of tax of $1,993	0
Foreign currency translation loss	(10,316)				(10,316)
Ending balance (in shares) at Jun. 30, 2018		27,729
Ending balance at Jun. 30, 2018	443,314	$ 277	294,380	176,718	(28,061)
Beginning balance (in shares) at Mar. 31, 2018		27,666
Beginning balance at Mar. 31, 2018	484,859	$ 276	293,704	203,159	(12,280)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(24,511)			(24,511)
Cash dividends declared	(1,930)			(1,930)
Share-based compensation expense (in shares)		78
Share-based compensation expense	1,078	$ 1	1,077
Shares issued for option exercises (in shares)		4
Shares issued for option exercises	32		32
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(19)
Restricted shares and performance shares forgiven for taxes and forfeited	(433)		(433)
Change in fair value of interest rate swap, net of tax of $1,993	0
Foreign currency translation loss	(15,781)				(15,781)
Ending balance (in shares) at Jun. 30, 2018		27,729
Ending balance at Jun. 30, 2018	443,314	$ 277	294,380	176,718	(28,061)
Beginning balance (in shares) at Dec. 31, 2018		42,104
Beginning balance at Dec. 31, 2018	418,295	$ 421	511,545	(62,046)	(31,625)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(25,297)			(25,297)
Cash dividends declared	(5,934)			(5,934)
Share-based compensation expense (in shares)		281
Share-based compensation expense	$ 1,979	$ 3	1,976
Shares issued for option exercises (in shares)	0
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(18)
Restricted shares and performance shares forgiven for taxes and forfeited	$ (141)		(141)
Change in fair value of interest rate swap, net of tax of $1,993	(10,818)				(10,818)
Foreign currency translation loss	(172)				(172)
Ending balance (in shares) at Jun. 30, 2019		42,367
Ending balance at Jun. 30, 2019	377,861	$ 424	513,380	(93,328)	(42,615)
Beginning balance (in shares) at Mar. 31, 2019		42,367
Beginning balance at Mar. 31, 2019	394,840	$ 424	512,274	(83,639)	(34,219)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(6,697)			(6,697)
Cash dividends declared	(2,992)			(2,992)
Share-based compensation expense	1,106		1,106
Change in fair value of interest rate swap, net of tax of $1,993	(6,962)				(6,962)
Foreign currency translation loss	(1,434)				(1,434)
Ending balance (in shares) at Jun. 30, 2019		42,367
Ending balance at Jun. 30, 2019	$ 377,861	$ 424	$ 513,380	$ (93,328)	$ (42,615)