Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income (loss)	4,699
Denominator:
Shares used in computing basic earnings per share	42,758,000
Dilutive common stock equivalents	142,000
Shares used in computing diluted earnings per share	42,900,000
Basic net income (loss) per common share	0.11
Diluted earnings per share (price per share)	0.11
As Restated [Member]
Net income (loss)		48,113	[1]
Denominator:
Shares used in computing basic earnings per share		42,133,000	[1]
Dilutive common stock equivalents		474,000
Shares used in computing diluted earnings per share		42,607,000	[1]
Basic net income (loss) per common share		1.14	[1]
Diluted earnings per share (price per share)		1.13	[1]
Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	100,000	100,000

[1] (1) As restated - See Note 14 “Restatement of Previously Issued Financial Statements” of Notes to Condensed Consolidated Financial Statements.See notes to Condensed Consolidated Financial Statements.