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Stockholders' Equity (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Details of restricted stock unit activity
Number of Shares, Unvested at December 31, 2011	267
Weighted Average Grant Date Fair Value, Unvested, Beginning Balance	$ 29.93
Number of Shares, Granted	179
Weighted Average Grant Date Fair Value, Granted	$ 33.88
Number of Shares, Vested or settled	(49)
Weighted Average Grant Date Fair Value, Vested or settled	$ 27.60
Number of Shares, Forfeited	(96)
Weighted Average Grant Date Fair Value, Forfeited	$ 28.90
Number of Shares, Unvested at December 31, 2012	301
Weighted Average Grant Date Fair Value , Unvested, Ending Balance	$ 32.98

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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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