CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balances at beginning of period (Scenario, Actual [Member])	$ (490,875)	$ 423	$ 1,028,798	$ (1,444,833)	$ (82,301)	$ 7,038
Balances at beginning of period (in shares) (Scenario, Actual [Member])		42,339,000			(3,734,000)
Stock issued pursuant to employee stock plans (Scenario, Actual [Member])	354		(668)	(5,737)	6,759
Stock issued pursuant to employee stock plans (in shares) (Scenario, Actual [Member])					331,000
Stock-based compensation (Scenario, Actual [Member])	11,432		11,432
Net income (Scenario, Actual [Member])	92,891
Other comprehensive loss (Scenario, Actual [Member])	606					606
Comprehensive loss (Scenario, Actual [Member])	93,497
Balances at end of period (Scenario, Actual [Member])	(385,592)	423	1,039,562	(1,357,679)	(75,542)	7,644
Balances at end of period (in shares) (Scenario, Actual [Member])		42,339,000			(3,403,000)
Stock issued pursuant to employee stock plans	(96)		(3,095)		2,999
Stock issued pursuant to employee stock plans (in shares)					146,000
Stock-based compensation	6,917		6,917
Net income	21,153
Other comprehensive loss	(1,717)					(1,717)
Comprehensive loss	19,436
Balances at end of period at Dec. 31, 2013	(359,335)	423	1,043,384	(1,336,526)	(72,543)	5,927
Balances at end of period (in shares) at Dec. 31, 2013		42,339,000			(3,257,000)
Stock repurchased (in shares)	0
Stock issued pursuant to employee stock plans	(436)		(4,928)		4,492
Stock issued pursuant to employee stock plans (in shares)					212,000
Stock-based compensation	11,513		11,513
Net income	14,728
Other comprehensive loss	(7,540)					(7,540)
Comprehensive loss	7,188
Balances at end of period at Dec. 31, 2014	$ (341,070)	$ 423	$ 1,049,969	$ (1,321,798)	$ (68,051)	$ (1,613)
Balances at end of period (in shares) at Dec. 31, 2014		42,339,000			(3,045,000)