Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional paid in capital	Retained (deficit) earnings	Accumulated Other Comprehensive Income (loss)	Non- controlling interest
Beginning Balance at Dec. 31, 2015	$ 312,431	$ 269	$ 277,917	$ 56,096	$ (21,883)	$ 32
Beginning Balance, (in shares) at Dec. 31, 2015		26,849
Net income (loss)	6,663			6,663
Cash dividends declared	(7,584)			(7,584)
Share-based compensation expense	3,935	$ 0	3,935
Share-based compensation expense (in shares)		142
Shares issued for option exercises	2,832	$ 3	2,829
Shares issued for option exercises (in shares)		270
Restricted shares and performance shares forgiven for taxes and forfeited	(173)		(173)
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(12)
Foreign currency translation loss	(10,623)				(10,623)
Change in fair value of interest rate swap	1,910				1,910
Ending Balance at Dec. 31, 2016	309,391	$ 272	284,508	55,175	(30,596)	32
Ending Balance, (in shares) at Dec. 31, 2016		27,249
Net income (loss)	163,052			163,052
Cash dividends declared	(7,887)			(7,887)
Share-based compensation expense	5,496	$ 1	5,495
Share-based compensation expense (in shares)		85
Shares issued for option exercises	3,110	$ 2	3,108
Shares issued for option exercises (in shares)		263
Sale of discontinued operations	(9,275)				(9,243)	(32)
Restricted shares and performance shares forgiven for taxes and forfeited	(617)		(617)
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(25)
Foreign currency translation loss	22,094				22,094
Adoption of new accounting standard	740			740
Ending Balance at Dec. 31, 2017	486,104	$ 275	292,494	211,080	(17,745)	0
Ending Balance, (in shares) at Dec. 31, 2017		27,572
Net income (loss)	(264,467)			(264,467)
Cash dividends declared	(8,803)			(8,803)
Share-based compensation expense	4,384	$ 2	4,382
Share-based compensation expense (in shares)		165
Shares issued for option exercises	$ 274	$ 0	274
Shares issued for option exercises (in shares)	27	27
Restricted shares and performance shares forgiven for taxes and forfeited	$ (805)		(805)
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(35)
Foreign currency translation loss	(13,880)				(13,880)
Adoption of new accounting standard	16			16
Shares issued	217,312	$ 144	217,168
Shares issued (in shares)		14,375
Change in estimate of performance share vesting	(1,840)		(1,968)	128
Ending Balance at Dec. 31, 2018	$ 418,295	$ 421	$ 511,545	$ (62,046)	$ (31,625)	$ 0
Ending Balance, (in shares) at Dec. 31, 2018		42,104