CONSOLDATED STATEMENTS OF STOCKHOLDERS' DEFICIT Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]
Balances at beginning of period (in shares) at Dec. 31, 2018		42,339			(391)
Balances at beginning of period at Dec. 31, 2018	$ (166,661)	$ 423	$ 1,028,924	$ (1,187,010)	$ (5,231)	$ (3,767)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		0			391
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(1,381)	$ 0	(6,612)	0	$ 5,231	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	1,738		1,738
Net Income (Loss) Attributable to Parent	(213)			(213)
Other Comprehensive Income (Loss), Net of Tax	(548)					(548)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	(23)		(23)
Capped Call Transaction Cost Reimbursement	1		1
Balances at end of period (in shares) at Mar. 31, 2019		42,339			0
Balances at end of period at Mar. 31, 2019	(167,087)	$ 423	1,024,028	(1,187,223)	$ 0	(4,315)
Balances at beginning of period (in shares) at Dec. 31, 2018		42,339			(391)
Balances at beginning of period at Dec. 31, 2018	(166,661)	$ 423	1,028,924	(1,187,010)	$ (5,231)	(3,767)
Net Income (Loss) Attributable to Parent	(7,771)
Balances at end of period (in shares) at Sep. 30, 2019		43,007			0
Balances at end of period at Sep. 30, 2019	(172,925)	$ 429	1,025,796	(1,194,781)	$ 0	(4,369)
Balances at beginning of period (in shares) at Mar. 31, 2019		42,339			0
Balances at beginning of period at Mar. 31, 2019	(167,087)	$ 423	1,024,028	(1,187,223)	$ 0	(4,315)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		381			0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(200)	$ 4	(204)	0	$ 0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,005		2,005
Net Income (Loss) Attributable to Parent	(10,723)			(10,723)
Other Comprehensive Income (Loss), Net of Tax	710					710
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	(554)		(554)
Capped Call Transaction Cost Reimbursement	26		26
Balances at end of period (in shares) at Jun. 30, 2019		42,720			0
Balances at end of period at Jun. 30, 2019	(175,823)	$ 427	1,025,301	(1,197,946)	$ 0	(3,605)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		287			0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(1,548)	$ 2	(1,550)	0	$ 0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	2,045		2,045
Net Income (Loss) Attributable to Parent	3,165			3,165
Other Comprehensive Income (Loss), Net of Tax	(764)					(764)
Balances at end of period (in shares) at Sep. 30, 2019		43,007			0
Balances at end of period at Sep. 30, 2019	(172,925)	$ 429	1,025,796	(1,194,781)	$ 0	(4,369)
Balances at beginning of period (in shares) at Dec. 31, 2019		43,150			0
Balances at beginning of period at Dec. 31, 2019	(155,085)	$ 430	1,027,824	(1,179,409)	$ 0	(3,930)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		398			0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(1,814)	$ 4	(1,818)	0	$ 0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	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 (in shares) at Mar. 31, 2020		43,548			0
Balances at end of period at Mar. 31, 2020	(161,462)	$ 434	1,028,115	(1,185,266)	$ 0	(4,745)
Balances at beginning of period (in shares) at Dec. 31, 2019		43,150			0
Balances at beginning of period at Dec. 31, 2019	(155,085)	$ 430	1,027,824	(1,179,409)	$ 0	(3,930)
Net Income (Loss) Attributable to Parent	3,975
Balances at end of period (in shares) at Sep. 30, 2020		44,123			0
Balances at end of period at Sep. 30, 2020	(144,212)	$ 439	1,033,599	(1,175,434)	$ 0	(2,816)
Balances at beginning of period (in shares) at Mar. 31, 2020		43,548			0
Balances at beginning of period at Mar. 31, 2020	(161,462)	$ 434	1,028,115	(1,185,266)	$ 0	(4,745)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		368			0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	(535)	$ 3	(538)	0	$ 0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	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 (in shares) at Jun. 30, 2020		43,916			0
Balances at end of period at Jun. 30, 2020	(156,492)	$ 437	1,030,303	(1,183,421)	$ 0	(3,811)
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture		207			0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	1	$ 2	(1)	0	$ 0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	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 (in shares) at Sep. 30, 2020		44,123			0
Balances at end of period at Sep. 30, 2020	$ (144,212)	$ 439	$ 1,033,599	$ (1,175,434)	$ 0	$ (2,816)