Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Parent	Noncontrolling Interest	Comprehensive Income
Beginning balance (shares) at Dec. 31, 2018		42,984,578
Beginning balance (Total) at Dec. 31, 2018	$ 540,369
Beginning balance (NCI) at Dec. 31, 2018							$ 20,139
Beginning balance (Parent) at Dec. 31, 2018		$ 4	$ 389,141	$ (431)	$ 140,546	$ 520,230		$ (9,030)
Net Income (Loss), Total	(21,434)
Net Income (Loss), Parent	(21,714)	0	0	0	(21,714)	(21,714)		0
Net Income (Loss), NCI	280						280
Other Comprehensive Income (Loss), Parent		$ 0	0	0	0	22,744		22,744
Other Comprehensive Income (Loss), NCI							257
Other Comprehensive Income (Loss), Total	23,001
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture		249,910
Stock Issued During Period, Value, Restricted Stock Award, Gross	2,292	$ 0	2,292	0		2,292	0	0
Cash dividends on common stock	(7,710)	$ 0	0	0	(7,710)	(7,710)	0	0
Ending Balance (shares) at Sep. 30, 2019		43,234,488
Ending Balance (Total) at Sep. 30, 2019	536,518
Ending Balance (Parent) at Sep. 30, 2019		$ 4	391,433	(431)	111,122	515,842		13,714
Ending balance (NCI) at Sep. 30, 2019							20,676
Beginning balance (shares) at Jun. 30, 2019		43,231,184
Beginning balance (Total) at Jun. 30, 2019	562,488
Beginning balance (NCI) at Jun. 30, 2019							20,575
Beginning balance (Parent) at Jun. 30, 2019		$ 4	390,719	(431)	141,973	541,913		9,648
Net Income (Loss), Total	(28,215)
Net Income (Loss), Parent	(28,280)	0	0	0	(28,280)	(28,280)		0
Net Income (Loss), NCI	65						65
Other Comprehensive Income (Loss), Parent		$ 0	0	0	0	4,066		4,066
Other Comprehensive Income (Loss), NCI							36
Other Comprehensive Income (Loss), Total	4,102
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture		3,304
Stock Issued During Period, Value, Restricted Stock Award, Gross	714	$ 0	714	0	0	714	0	0
Cash dividends on common stock	(2,571)	$ 0	0	0	(2,571)	(2,571)	0	0
Ending Balance (shares) at Sep. 30, 2019		43,234,488
Ending Balance (Total) at Sep. 30, 2019	$ 536,518
Ending Balance (Parent) at Sep. 30, 2019		$ 4	391,433	(431)	111,122	515,842		13,714
Ending balance (NCI) at Sep. 30, 2019							20,676
Beginning balance (shares) at Dec. 31, 2019	43,028,074	43,028,074
Beginning balance (Total) at Dec. 31, 2019	$ 523,865
Beginning balance (NCI) at Dec. 31, 2019	20,727						20,727
Beginning balance (Parent) at Dec. 31, 2019	503,138	$ 4	391,852	(431)	100,394	503,138		11,319
Net Income (Loss), Total	(61,942)
Net Income (Loss), Parent	(62,521)	0	0	0	(62,521)	(62,521)		0
Net Income (Loss), NCI	579						579
Other Comprehensive Income (Loss), Parent		0	0	0	0	20,413		20,413
Other Comprehensive Income (Loss), NCI							152
Other Comprehensive Income (Loss), Total	20,565
Effect of new accounting principle in period of adoption	(262)	$ 0	0	0	(262)	(262)	0	0
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture		52,336
Stock Issued During Period, Value, Restricted Stock Award, Gross	902		902	0	0	902	0	0
Cash dividends on common stock	$ (7,730)	$ 0	0	0	(7,730)	(7,730)	0	0
Ending Balance (shares) at Sep. 30, 2020	43,080,410	43,080,410
Ending Balance (Total) at Sep. 30, 2020	$ 475,398
Ending Balance (Parent) at Sep. 30, 2020	453,940	$ 4	392,754	(431)	29,881	453,940		31,732
Ending balance (NCI) at Sep. 30, 2020	21,458						21,458
Beginning balance (shares) at Jun. 30, 2020		43,068,379
Beginning balance (Total) at Jun. 30, 2020	549,517
Beginning balance (NCI) at Jun. 30, 2020							21,250
Beginning balance (Parent) at Jun. 30, 2020		$ 4	392,633	(431)	106,534	528,267		29,527
Net Income (Loss), Total	(73,868)
Net Income (Loss), Parent	(74,072)	0	0	0	(74,072)	(74,072)		0
Net Income (Loss), NCI	204						204
Other Comprehensive Income (Loss), Parent		$ 0	0	0	0	2,205		2,205
Other Comprehensive Income (Loss), NCI							4
Other Comprehensive Income (Loss), Total	2,209
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture		12,031
Stock Issued During Period, Value, Restricted Stock Award, Gross	121	$ 0	121	0	0	121	0	0
Cash dividends on common stock	$ (2,581)	$ 0	0	0	(2,581)	(2,581)	0	0
Ending Balance (shares) at Sep. 30, 2020	43,080,410	43,080,410
Ending Balance (Total) at Sep. 30, 2020	$ 475,398
Ending Balance (Parent) at Sep. 30, 2020	453,940	$ 4	$ 392,754	$ (431)	$ 29,881	$ 453,940		$ 31,732
Ending balance (NCI) at Sep. 30, 2020	$ 21,458						$ 21,458