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Stockholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	6 Months Ended			6 Months Ended				6 Months Ended								0 Months Ended
	May 08, 2014	Jun. 30, 2014	Jun. 30, 2013	May 08, 2014	Jun. 30, 2014 Stock Options	Jun. 30, 2013 Stock Options	Jun. 30, 2014 Restricted Stock	Jun. 30, 2014 2002 Stock Incentive Plan Stock Options	Jun. 30, 2014 Employee Stock Purchase Plan	Jun. 30, 2013 Employee Stock Purchase Plan	Jun. 30, 2014 Employee Stock Purchase Plan Stock Options	Jun. 30, 2013 Employee Stock Purchase Plan Stock Options	Jun. 30, 2014 Certain Directors 2002 Stock Incentive Plan	Jun. 30, 2014 Employees	Jun. 30, 2014 Vesting Period One 2002 Stock Incentive Plan Stock Options	Jun. 30, 2014 Vesting Period Two 2002 Stock Incentive Plan Stock Options	Jul. 17, 2014 Subsequent Event	Jul. 17, 2014 Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period							3 years						1 year	4 years	6 months	42 months
Award Vesting Rights, Percentage															12.50%	2.08%
Award Vesting Rights					1/8 on the six month anniversary of the date of grant, and 1/48 each month thereafter for 42 months
Award Expiration Period					10 years
Weighted-average grant date fair value of stock options					$ 47.44
Intrinsic value of options exercised					$ 13,700,000	$ 800,000
Unrecognized compensation cost					17,500,000
Weighted-average period in which cost is expected to be recognized					2 years 6 months 15 days		1 year 8 months 16 days
Net proceeds from employee stock purchase plan											3,600,000	1,100,000
Shares available for future option grants								1,100,000
Unrecognized compensation cost, restricted stock							2,700,000
Employee Stock Purchase Plan
Shares allowed to purchase in employee stock purchase plan									1,250
Offering period of shares in employee stock purchase plan									6 months
Percentage of purchase price of stock									85.00%
Discount rate									15.00%
Shares issued in period									2,230	5,016
Stock-based compensation		5,093,000	2,616,000						30,627	26,000
Shares available for future purchases									77,285
Corporate Share Repurchase
Stock repurchase, authorized amount				$ 5,000,000														$ 10,000,000
Stock repurchase, maximum period	1 year																1 year

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The highest quantity of shares an employee can purchase under the plan per period.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of share instruments newly issued under a share-based compensation plan.

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