Consolidated Statements of Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]
Beginning balance (in shares) at Dec. 31, 2018		39,498,000
Beginning balance at Dec. 31, 2018	$ 734,048		$ 1,334,364	$ (196,305)	$ (425,396)	$ 712,663	$ 21,385
Net income (loss)	(149)				(1,907)	(1,907)	1,758
Other comprehensive income (loss), net of tax	(1,780)			(1,780)		(1,780)
Distributions to noncontrolling interests	(517)						(517)
Net stock issuance and repurchases (in shares)		360,000
Net stock issues and repurchases	1,195		1,195			1,195
Stock-based compensation expense	7,048		7,048			7,048
Stock repurchased during period (in shares)		165,000
Stock repurchased	(7,814)		(7,814)			(7,814)
Ending balance (in shares) at Mar. 31, 2019		39,693,000
Ending balance at Mar. 31, 2019	732,031		1,334,793	(198,085)	(427,303)	709,405	22,626
Beginning balance (in shares) at Dec. 31, 2018		39,498,000
Beginning balance at Dec. 31, 2018	734,048		1,334,364	(196,305)	(425,396)	712,663	21,385
Net income (loss)	38,145
Other comprehensive income (loss), net of tax	(10,749)
Ending balance (in shares) at Sep. 30, 2019		39,533,000
Ending balance at Sep. 30, 2019	761,916		1,335,353	(207,054)	(391,010)	737,289	24,627
Net income attributable to noncontrolling interests	3,759
Net Income (Loss) Attributable to Parent	34,386
Beginning balance (in shares) at Dec. 31, 2018		39,498,000
Beginning balance at Dec. 31, 2018	$ 734,048		1,334,364	(196,305)	(425,396)	712,663	21,385
Stock repurchased during period (in shares)	529,396
Stock repurchased	$ (25,000)
Ending balance (in shares) at Dec. 31, 2019	39,941,000	39,941,000
Ending balance at Dec. 31, 2019	$ 800,815		1,357,600	(204,672)	(376,390)	776,538	24,277
Beginning balance (in shares) at Mar. 31, 2019		39,693,000
Beginning balance at Mar. 31, 2019	732,031		1,334,793	(198,085)	(427,303)	709,405	22,626
Net income (loss)	20,117					19,446
Other comprehensive income (loss), net of tax	3,736			3,736		3,736
Net stock issuance and repurchases (in shares)		66,000
Net stock issues and repurchases	1,481		1,481			1,481
Stock-based compensation expense	6,420		6,420			6,420
Stock repurchased during period (in shares)		364,000
Stock repurchased	(17,186)		(17,186)			(17,186)
Ending balance (in shares) at Jun. 30, 2019		39,395,000
Ending balance at Jun. 30, 2019	746,599		1,325,508	(194,349)	(407,857)	723,302	23,297
Net income attributable to noncontrolling interests							671
Net Income (Loss) Attributable to Parent					19,446
Net income (loss)	18,177					16,847
Other comprehensive income (loss), net of tax	(12,705)			(12,705)		(12,705)
Net stock issuance and repurchases (in shares)		138,000
Net stock issues and repurchases	2,722		2,722			2,722
Stock-based compensation expense	7,123		7,123			7,123
Ending balance (in shares) at Sep. 30, 2019		39,533,000
Ending balance at Sep. 30, 2019	761,916		1,335,353	(207,054)	(391,010)	737,289	24,627
Net income attributable to noncontrolling interests	1,330						1,330
Net Income (Loss) Attributable to Parent	$ 16,847				16,847
Beginning balance (in shares) at Dec. 31, 2019	39,941,000	39,941,000
Beginning balance at Dec. 31, 2019	$ 800,815		1,357,600	(204,672)	(376,390)	776,538	24,277
Net income (loss)	9,162				8,684	8,684	478
Other comprehensive income (loss), net of tax	(25,211)			(25,211)		(25,211)
Net stock issuance and repurchases (in shares)		235,000
Net stock issues and repurchases	2,247		2,247			2,247
Stock-based compensation expense	8,482		8,482			8,482
Ending balance (in shares) at Mar. 31, 2020		40,176,000
Ending balance at Mar. 31, 2020	$ 795,495		1,368,329	(229,883)	(367,706)	770,740	24,755
Beginning balance (in shares) at Dec. 31, 2019	39,941,000	39,941,000
Beginning balance at Dec. 31, 2019	$ 800,815		1,357,600	(204,672)	(376,390)	776,538	24,277
Net income (loss)	(78,383)
Other comprehensive income (loss), net of tax	$ 50,659
Ending balance (in shares) at Sep. 30, 2020	40,356,000	40,356,000
Ending balance at Sep. 30, 2020	$ 797,265		1,381,774	(154,013)	(455,865)	771,896	25,369
Net income attributable to noncontrolling interests	1,092
Net Income (Loss) Attributable to Parent	(79,475)
Beginning balance (in shares) at Mar. 31, 2020		40,176,000
Beginning balance at Mar. 31, 2020	795,495		1,368,329	(229,883)	(367,706)	770,740	24,755
Net income (loss)	(62,487)				(62,802)	(62,802)	315
Other comprehensive income (loss), net of tax	62,056			62,056		62,056
Net stock issuance and repurchases (in shares)		58,000
Net stock issues and repurchases	706		706			706
Stock-based compensation expense	7,099		7,099			7,099
Ending balance (in shares) at Jun. 30, 2020		40,234,000
Ending balance at Jun. 30, 2020	802,869		1,376,134	(167,827)	(430,508)	777,799	25,070
Net income (loss)	(25,058)				(25,357)	(25,357)	299
Other comprehensive income (loss), net of tax	13,814			13,814		13,814
Net stock issuance and repurchases (in shares)		122,000
Net stock issues and repurchases			583
Stock-based compensation expense	$ 5,057		5,057			5,057
Ending balance (in shares) at Sep. 30, 2020	40,356,000	40,356,000
Ending balance at Sep. 30, 2020	$ 797,265		$ 1,381,774	$ (154,013)	$ (455,865)	$ 771,896	$ 25,369
Net income attributable to noncontrolling interests	299
Net Income (Loss) Attributable to Parent	$ (25,357)