Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent
Beginning balance (in shares) at Dec. 31, 2017		27,572,000
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	(44,796)			(44,796)
Cash dividends declared	$ (5,836)			(5,836)
Stock Issued During Period, Shares, New Issues	14,375,000
Stock Issued During Period, Value, New Issues	$ 217,312	$ 144	217,168
Share-based compensation expense (in shares)		(165,000)
Share-based compensation expense	3,425	$ 2	3,423
Shares issued for option exercises (in shares)		27,000
Shares issued for option exercises	274		274
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(35,000)
Restricted shares and performance shares forgiven for taxes and forfeited	(723)		(723)
Adjustments to Additional Paid in Capital, Adjustments to Performance Shares Vesting Estimates	(753)		(802)	49
Reclassification of interest rate swap settlement to income, net of tax of $68	0
Foreign currency translation loss	(14,509)				(14,509)
Ending balance (in shares) at Sep. 30, 2018		42,104,000
Ending balance at Sep. 30, 2018	640,515	$ 421	511,834	160,514	(32,254)
Beginning balance (in shares) at Jun. 30, 2018		27,729,000
Beginning balance at Jun. 30, 2018	442,795	$ 277	294,380	176,199	(28,061)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(13,784)			(13,784)
Cash dividends declared	$ (1,950)			(1,950)
Stock Issued During Period, Shares, New Issues	14,375,000
Stock Issued During Period, Value, New Issues	$ 217,312	$ 144	217,168
Share-based compensation expense	1,091		1,091
Restricted shares and performance shares forgiven for taxes and forfeited	(3)		(3)
Adjustments to Additional Paid in Capital, Adjustments to Performance Shares Vesting Estimates	753		802	(49)
Reclassification of interest rate swap settlement to income, net of tax of $68	0
Foreign currency translation loss	(4,193)				(4,193)
Ending balance (in shares) at Sep. 30, 2018		42,104,000
Ending balance at Sep. 30, 2018	640,515	$ 421	511,834	160,514	(32,254)
Beginning balance (in shares) at Dec. 31, 2018		42,104,000
Beginning balance at Dec. 31, 2018	421,270	$ 421	511,545	(59,071)	(31,625)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(30,894)			(30,894)
Cash dividends declared	(8,907)			(8,907)
Share-based compensation expense (in shares)		(231,000)
Share-based compensation expense	$ 3,130	$ 2	3,128
Shares issued for option exercises (in shares)	5,000	5,000
Shares issued for option exercises	$ 21		21
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(43,000)
Restricted shares and performance shares forgiven for taxes and forfeited	(151)		(151)
Adjustments to Additional Paid in Capital, Adjustments to Performance Shares Vesting Estimates	(1,240)		(1,275)	35
Change in fair value of interest rate swap, net of tax of $376	(11,999)				(11,999)
Reclassification of interest rate swap settlement to income, net of tax of $68	238				238
Foreign currency translation loss	(11,620)				(11,620)
Ending balance (in shares) at Sep. 30, 2019		42,297,000
Ending balance at Sep. 30, 2019	359,797	$ 423	513,268	(98,888)	(55,006)
Beginning balance (in shares) at Jun. 30, 2019		42,367,000
Beginning balance at Jun. 30, 2019	380,836	$ 424	513,380	(90,353)	(42,615)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(5,597)			(5,597)
Cash dividends declared	(2,973)			(2,973)
Share-based compensation expense	1,151		1,152
Shares issued for option exercises (in shares)		5,000
Shares issued for option exercises	21		21
Restricted shares and performance shares forgiven for taxes and forfeited (in shares)		(25,000)
Restricted shares and performance shares forgiven for taxes and forfeited	(10)		(10)
Adjustments to Additional Paid in Capital, Adjustments to Performance Shares Vesting Estimates	(1,240)		(1,275)	35
Change in fair value of interest rate swap, net of tax of $376	(1,181)				(1,181)
Reclassification of interest rate swap settlement to income, net of tax of $68	238				238
Foreign currency translation loss	(11,448)				(11,448)
Ending balance (in shares) at Sep. 30, 2019		42,297,000
Ending balance at Sep. 30, 2019	$ 359,797	$ 423	$ 513,268	$ (98,888)	$ (55,006)