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Stock Based Awards and Other Equity Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
RSUs [Member]
Summary of the unrecognized compensation expense, net of estimated forfeitures and the weighted average period remaining
Unrecognized compensation expense (net of forfeitures), RSUs	$ 4,486
Weighted average period remaining (in years), RSUs	1 year 9 months 18 days
Stock Options [Member]
Summary of the unrecognized compensation expense, net of estimated forfeitures and the weighted average period remaining
Unrecognized compensation expense (net of forfeitures), Stock Options	$ 59,686
Weighted average period remaining (in years), Stock Options	3 years