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Stockholders' Equity (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Details of restricted stock unit activity
Number of Shares, Unvested at December 31, 2012	301
Number of Shares, Granted	7
Number of Shares, Vested or settled
Number of Shares, Forfeited	(44)
Number of Shares, Unvested at March 31, 2013	264
Weighted Average Grant Date Fair Value, Unvested, Beginning Balance	$ 32.98
Weighted Average Grant Date Fair Value, Granted	$ 27.55
Weighted Average Grant Date Fair Value, Vested or settled
Weighted Average Grant Date Fair Value, Forfeited	$ 30.30
Weighted Average Grant Date Fair Value , Unvested, Ending Balance	$ 33.29

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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