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Stockholders' Equity (Narrative) (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Employee Stock Purchase Plan |  |
Stock-based compensation | $ 6,675,000 | $ 5,093,000
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
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 | $ 33.66 |
Intrinsic value of options exercised | $ 12,400,000 | $ 13,700,000
Unrecognized compensation cost | $ 16,000,000 |
Weighted-average period in which cost is expected to be recognized | 2 years 7 months 6 days |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 3 years |
Weighted-average period in which cost is expected to be recognized | 2 years 18 days |
Unrecognized compensation cost, restricted stock | $ 5,400,000 |
2002 Stock Incentive Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future option grants | 800,000 |
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Expiration Period | 6 months | 6 months
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 | 2,654 | 2,230
Stock-based compensation | $ 36,000 | $ 31,000
Shares available for future purchases | 73,087 |
Shares issued under employee stock purchase plan | 200,000 |
Volatility rate | 36.00% | 39.00%
Employee Stock Purchase Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Net proceeds from employee stock purchase plan | $ 5,300,000 | $ 3,600,000
Tax benefit related to options exercised | $ 0 |
Certain Directors | 2002 Stock Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 1 year |
Employees |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 4 years |
Vesting Period One | 2002 Stock Incentive Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 6 months |
Award Vesting Rights, Percentage | 12.50% |
Vesting Period Two | 2002 Stock Incentive Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award Vesting Period | 42 months |
Award Vesting Rights, Percentage | 2.08% |

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