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Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Corporate Share Repurchase |  |
Stock repurchase, authorized amount | $ 5.0 |
Stock repurchase, maximum period | 1 year |
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 | $ 47.93 |
Intrinsic value of options exercised | 12.1 | 0.2
Unrecognized compensation cost | 17.9 |
Weighted-average period in which cost is expected to be recognized | 2 years 6 months 15 days |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted-average period in which cost is expected to be recognized | 1 year 5 months 27 days |
Unrecognized compensation cost, restricted stock | 2.6 |
2002 Stock Incentive Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future option grants | 1,100,000 |
Employee Stock Purchase Plan |  |
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 available for future purchases | 79,515 |
Employee Stock Purchase Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Net proceeds from employee stock purchase plan | $ 3.2 | $ 0.3
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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