Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at at Dec. 31, 2020	$ 855,497,000	$ 596,000	$ 855,547,000	$ 78,010,000	$ (78,656,000)
Balance at (in shares) at Dec. 31, 2020		59,560,036
Stock-based compensation plans
Grant of restricted stock	0	$ 1,000	(1,000)
Grant of restricted stock (in shares)		121,339
Withholdings of common shares, net of issuances	(1,241,000)	$ 1,000	(1,242,000)
Withholdings of common shares, net of issuances (in shares)		92,234
Conversion of warrants	0	$ 0	0
Forfeited restricted stock (in shares)		(2,800)
Stock Issued During Period, Value, Conversion of Convertible Securities	131,967,000	$ 144,000	131,823,000
Stock Issued During Period, Shares, Conversion of Convertible Securities		14,428,445
Amortization of stock awards and restricted stock	5,523,000		5,523,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	191,090,000			186,896,000	4,194,000
Balance at at Sep. 30, 2021	1,182,836,000	$ 742,000	991,650,000	264,906,000	(74,462,000)
Balance at (in shares) at Sep. 30, 2021		74,199,254
Balance at at Jun. 30, 2021	1,114,727,000	$ 742,000	989,611,000	200,234,000	(75,860,000)
Balance at (in shares) at Jun. 30, 2021		74,202,815
Stock-based compensation plans
Grant of restricted stock	0	$ 0	0
Grant of restricted stock (in shares)		(761)
Withholdings of common shares, net of issuances	(5,000)	$ 0	(5,000)
Withholdings of common shares, net of issuances (in shares)		0
Conversion of warrants	0	$ 0	0
Forfeited restricted stock (in shares)		(2,800)
Amortization of stock awards and restricted stock	2,044,000		2,044,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	66,070,000			64,672,000	1,398,000
Balance at at Sep. 30, 2021	1,182,836,000	$ 742,000	991,650,000	264,906,000	(74,462,000)
Balance at (in shares) at Sep. 30, 2021		74,199,254
Balance at at Dec. 31, 2021	$ 1,322,377,000	$ 741,000	1,074,286,000	309,430,000	(62,080,000)
Balance at (in shares) at Dec. 31, 2021	74,142,183	74,142,183
Stock-based compensation plans
Grant of restricted stock	$ 0	$ 1,000	(1,000)
Grant of restricted stock (in shares)		109,200
Withholdings of common shares, net of issuances	(1,519,000)	$ 2,000	(1,521,000)
Withholdings of common shares, net of issuances (in shares)		120,053
Conversion of warrants	0	$ 0	0
Forfeited restricted stock (in shares)		(4,800)
Amortization of stock awards and restricted stock	6,149,000		6,149,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	157,213,000			155,930,000	1,283,000
Balance at at Sep. 30, 2022	$ 1,465,532,000	$ 744,000	1,039,354,000	486,231,000	(60,797,000)
Balance at (in shares) at Sep. 30, 2022	74,366,636	74,366,636
Stock-based compensation plans
Retained earnings | Accounting Standards Update 2020-06	$ (18,688,000)		(39,559,000)	20,871,000
Balance at at Jun. 30, 2022	1,411,493,000	$ 744,000	1,037,139,000	435,189,000	(61,579,000)
Balance at (in shares) at Jun. 30, 2022		74,369,138
Stock-based compensation plans
Withholdings of common shares, net of issuances	(80,000)	$ 0	(80,000)
Withholdings of common shares, net of issuances (in shares)		(2,202)
Conversion of warrants	0	$ 0	0
Forfeited restricted stock (in shares)		(300)
Amortization of stock awards and restricted stock	2,295,000		2,295,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	51,824,000			51,042,000	782,000
Balance at at Sep. 30, 2022	$ 1,465,532,000	$ 744,000	$ 1,039,354,000	$ 486,231,000	$ (60,797,000)
Balance at (in shares) at Sep. 30, 2022	74,366,636	74,366,636