CONSOLDATED STATEMENTS OF STOCKHOLDERS' DEFICIT Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Shares, Issued						43,150,000
Balances at beginning of period at Dec. 31, 2019	$ (155,085)	$ 430	$ 1,027,824	$ (1,179,409)	$ (3,930)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		398,000
Stock issued pursuant to employee stock plans	(1,814)	$ 4	(1,818)
Stock-based compensation	2,109		2,109
Net Income (Loss) Attributable to Parent	(5,857)			(5,857)
Other Comprehensive Income (Loss), Net of Tax	(815)				(815)
Balances at end of period at Mar. 31, 2020	(161,462)	434	1,028,115	(1,185,266)	(4,745)
Balances at beginning of period at Dec. 31, 2019	(155,085)	430	1,027,824	(1,179,409)	(3,930)
Net Income (Loss) Attributable to Parent	3,975
Balances at end of period at Sep. 30, 2020	(144,212)	$ 439	1,033,599	(1,175,434)	(2,816)
Shares, Issued		43,548,000
Balances at beginning of period at Mar. 31, 2020	(161,462)	$ 434	1,028,115	(1,185,266)	(4,745)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		368,000
Stock issued pursuant to employee stock plans	(535)	$ 3	(538)
Stock-based compensation	2,726		2,726
Net Income (Loss) Attributable to Parent	1,845			1,845
Other Comprehensive Income (Loss), Net of Tax	934				934
Balances at end of period at Jun. 30, 2020	(156,492)	$ 437	1,030,303	(1,183,421)	(3,811)
Shares, Issued		43,916,000
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		207,000
Stock issued pursuant to employee stock plans	1	$ 2	(1)
Stock-based compensation	3,297		3,297
Net Income (Loss) Attributable to Parent	7,987			7,987
Other Comprehensive Income (Loss), Net of Tax	995				995
Balances at end of period at Sep. 30, 2020	(144,212)	$ 439	1,033,599	(1,175,434)	(2,816)
Shares, Issued		44,123,000
Shares, Issued						44,420,000
Balances at beginning of period at Dec. 31, 2020	(132,924)	$ 442	1,036,658	(1,168,347)	(1,677)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		592,000
Stock issued pursuant to employee stock plans	(7,706)	$ 6	(7,712)
Stock-based compensation	3,122		3,122
Net Income (Loss) Attributable to Parent	4,391			4,391
Other Comprehensive Income (Loss), Net of Tax	(1,457)				(1,457)
Balances at end of period at Mar. 31, 2021	(134,574)	448	1,032,068	(1,163,956)	(3,134)
Balances at beginning of period at Dec. 31, 2020	(132,924)	442	1,036,658	(1,168,347)	(1,677)
Net Income (Loss) Attributable to Parent	26,172
Balances at end of period (in shares) at Sep. 30, 2021						(412,000)
Balances at end of period at Sep. 30, 2021	(126,431)	$ 454	1,030,116	(1,142,175)	(3,657)	$ (11,169)
Shares, Issued		45,012,000
Balances at beginning of period at Mar. 31, 2021	(134,574)	$ 448	1,032,068	(1,163,956)	(3,134)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		513,000
Stock issued pursuant to employee stock plans	(5,969)	$ 4	(5,973)
Stock-based compensation	3,580		3,580
Net Income (Loss) Attributable to Parent	7,006			7,006
Other Comprehensive Income (Loss), Net of Tax	215				215
Balances at end of period at Jun. 30, 2021	(129,742)	$ 452	1,029,675	(1,156,950)	(2,919)
Shares, Issued		45,525,000
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		168,000
Stock issued pursuant to employee stock plans	(3,071)	$ 2	(3,073)
Repurchase of common stock	(11,169)					$ (11,169)
Repurchase of common stock (in shares)						(412,175)
Stock-based compensation	3,514		3,514
Net Income (Loss) Attributable to Parent	14,775			14,775
Other Comprehensive Income (Loss), Net of Tax	(738)				(738)
Balances at end of period (in shares) at Sep. 30, 2021						(412,000)
Balances at end of period at Sep. 30, 2021	$ (126,431)	$ 454	$ 1,030,116	$ (1,142,175)	$ (3,657)	$ (11,169)
Shares, Issued		45,693,000