Stock-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended																			0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 2006 Equity Incentive Plan [Member]	Dec. 31, 2012 2006 Equity Incentive Plan [Member]	Dec. 31, 2011 2006 Equity Incentive Plan [Member]	Dec. 31, 2012 Inducement Plan [Member]	Dec. 31, 2012 1999 Stock Plan [Member]	Dec. 31, 2012 Tiny Prints 2008 Equity Plan [Member]	Dec. 31, 2012 Maximum [Member] 2006 Equity Incentive Plan [Member]	Dec. 31, 2012 Maximum [Member] Tiny Prints 2008 Equity Plan [Member]	Dec. 31, 2012 Minimum [Member] 2006 Equity Incentive Plan [Member]	Dec. 31, 2013 Minimum [Member] Tiny Prints 2008 Equity Plan [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] 2006 Equity Incentive Plan [Member]		May 25, 2012 Restricted Stock Units (RSUs) [Member] Inducement Plan [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] Inducement Plan [Member]		Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] Maximum [Member] 2006 Equity Incentive Plan [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] Minimum [Member] 2006 Equity Incentive Plan [Member]	Dec. 31, 2012 Performance Shares [Member] 2006 Equity Incentive Plan [Member]		Dec. 31, 2012 Performance Shares [Member] Inducement Plan [Member]		Dec. 31, 2012 Non-Qualified Stock Options [Member] 1999 Stock Plan [Member]	Dec. 31, 2012 Incentive Stock Options [Member] 1999 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair value price options under the plan to be granted, minimum (in hundredths)								85.00%
Percentage of fair value price options could be exercised on grant date, minimum (in hundredths)								100.00%
Percentage of stockholders with applicable exercise price (in hundredths)								10.00%
Percentage of exercise price of options granted to certain stockholders to fair value of shares on grant date (in hundredths)								110.00%
Vesting period of restricted stock, minimum (in years)								4 years		3 years	3 years	1 year	1 year								3 years		4 years	3 years	3 years		3 years
Percentage of shares vesting one year after the options' vesting commencement date (in hundredths)					25.00%				25.00%
Plan automatic replenishment provision (in hundredths)				3.10%	3.30%	3.50%
Options expiration term					10 years				10 years																				10 years	5 years
Number of options outstanding [Roll forward]
Balances (in shares)														2,768
Granted (in shares)														139	197	257
Exercised (in shares)														(771)
Forfeited, cancelled or expired (in shares)														(102)
Balances (in shares)														2,034	2,768
Options vested and expected to vest (in shares)														2,001
Options vested (in shares)														1,677	2,188	2,716
Weighted Average Exercise Price [Abstract]
Balances (in dollars per share)														$ 15.71
Granted (in dollars per share)														$ 28.72
Exercised (in dollars per share)														$ 13.24
Forfeited, cancelled or expired (in dollars per share)														$ 24.72
Balances (in dollars per share)														$ 17.09	$ 15.71
Options vested and expected to vest (in dollars per share)														$ 16.85
Options vested (in dollars per share)														$ 14.63
Weighted Average Contractual Term (Years) [Abstract]
Ending balance (in years)														5 years 6 months 0 days
Options vested and expected to vest at end of period (in years)														5 years 4 months 24 days
Options vested at end of period (in years)														4 years 9 months 18 days
Aggregate Intrinsic Value [Abstract]
Ending balance														$ 28,854,000
Options vested and expected to vest at end of period														28,718,000
Options vested at end of period														26,705,000
Weighted average grant-date fair value (in dollars per share)														$ 12.93	$ 20.32	$ 10.62
Total intrinsic value of options exercised														12,299,000	78,641,000	19,721,000
Net cash proceeds from the exercise of stock options														10,211,000
Assumptions used to value options granted [Abstract]
Dividend yield (in hundreths)	0.00%	0.00%	0.00%
Annual risk free rate of return (in hundreths)	0.80%	1.50%	1.90%
Expected volatility (in hundreths)	56.50%	53.30%	51.10%
Expected term (years)	4 years 3 months 18 days	4 years 3 months 18 days	4 years 6 months
Restricted Stock Units & Awards [Roll forward]
Awarded and unvested, beginning of period (in shares)																	1,969
Granted (in shares)					1,830		736										2,566	1,385	[1]	366	635	[2]			445	[3]	101	[4]
Vested (in shares)																	885
Forfeited (in shares)																	398
Awarded and unvested, ending period (in shares)																	3,252
Restricted stock units expected to vest, Ending period (in shares)																	2,895
Weighted Average Grant Date Fair Value [Abstract]
Awarded and unvested, beginning period (in dollars per share)																	$ 31.33
Granted (in dollars per share)																	$ 28.55
Vested (in dollars per share)																	$ 23.18
Forfeited (in dollars per share)																	$ 33.40
Awarded and unvested, ending period (in dollars per share)																	$ 31.10
Fair value of vested awards	20,507,000	12,419,000
Unrecognized compensation expense	$ 76,906,000
Weighted-average period of unrecognized compensation expense (in years)	3 years

[1] Awards issued under the 2006 Equity Incentive Plan include restricted stock awards granted to new and current employees. Awards issued under this plan typically vest over a three or four year total vesting term.

[2] Inducement awards are issued to newly hired officers and to new employees from acquired companies. These awards typically vest annually over a three year period based on continued employment. The above includes 366,000 RSUs to certain employees of Photoccino, Penguin Digital, and ThisLife.

[3] Includes 445,000 performance-based restricted stock units (PBRSUs) issued under the 2006 Equity Incentive Plan which are tied to the Company’s 2012 financial performance and which have three year service criteria. Compensation cost associated with these PBRSUs is recognized on an accelerated attribution model and ultimately based on whether or not satisfaction of the performance criteria is probable. As of December 31, 2012, the performance criteria for the fiscal year was met and the associated stock-based compensation has been recognized.

[4] Includes PBRSUs issued to certain employees in connection with the acquisitions of Penguin Digital and ThisLife, which have both performance and service vesting criteria and vest annually over a three year term contingent on achieving certain performance milestones and continued employment.