CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	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])	$ (310,336)	$ 423	$ 1,017,402	$ (1,246,347)	$ (91,025)	$ 9,211
Balances at beginning of period (Scenario, Previously Reported [Member])	426,610	423	1,005,198	(495,254)	(91,025)	7,268
Balances at beginning of period (Restatement Adjustment [Member])	(736,946)		12,204	(751,093)		1,943
Balances at beginning of period (in shares) (Scenario, Actual [Member])		42,339			(4,164)
Balances at beginning of period (in shares) (Scenario, Previously Reported [Member])		42,339			(4,164)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(419,368)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (Scenario, Actual [Member])	(419,368)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (Scenario, Previously Reported [Member])	172,371
Stock issued pursuant to employee stock plans	2,026		(1,213)	(5,485)	8,724
Stock issued pursuant to employee stock plans (in shares)					430
Stock-based compensation (Scenario, Actual [Member])	12,609		12,609
Net income	226,367
Net income (Scenario, Actual [Member])	226,367
Net income (Scenario, Previously Reported [Member])	(23,791)
Net income (Restatement Adjustment [Member])	244,819
Other comprehensive loss (Scenario, Actual [Member])	(2,173)					(2,173)
Comprehensive loss (Scenario, Actual [Member])	224,194
Balances at end of period at Dec. 31, 2011	(490,875)	423	1,028,798	(1,444,833)	(82,301)	7,038
Balances at end of period (in shares) at Dec. 31, 2011		42,339			(3,734)
Stock issued pursuant to employee stock plans	354		(668)	(5,737)	6,759
Stock issued pursuant to employee stock plans (in shares)					331
Stock-based compensation	11,432		11,432
Net income	92,891
Other comprehensive loss	606					606
Comprehensive loss	93,497
Balances at end of period at Dec. 31, 2012	(385,592)	423	1,039,562	(1,357,679)	(75,542)	7,644
Balances at end of period (in shares) at Dec. 31, 2012		42,339			(3,403)
Stock issued pursuant to employee stock plans	(96)		(3,095)		2,999
Stock issued pursuant to employee stock plans (in shares)					146
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			(3,257)