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Stock Based Compensation Expense (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified				6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2012 Incentive Stock Option Plan [Member]
Weighted average exercise prices for options granted and exercisable and the weighted average remaining contractual life for options outstanding
Number of Shares, Outstanding	1,274,462	1,353,174	1,388,514	1,274,462
Weighted Average Exercise Price, Outstanding	$ 6.94	$ 7.28	$ 7.44	$ 6.94
Weighted Average Remaining Life, Outstanding				58 months
Intrinsic Value, Outstanding				$ 25,044
Number of Shares, Expected to Vest				1,263,083
Weighted Average Exercise Price, Expected to Vest				$ 6.93
Weighted Average Remaining Contractual Life, Expected to Vest				58 months
Intrinsic Value, Expected to Vest				24,829
Number of Shares, Exercisable				648,796
Exercisable Weighted Average, Exercise Price	$ 6.27	$ 6.95	$ 7.26	$ 6.27
Weighted Average Remaining Contractual Life, Exercisable				17 months
Intrinsic Value, Exercisable				$ 13,183

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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