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Stock-Based Compensation (Additional Information) (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Compensation expense (income) |  |  | $ 5,652,000 | $ 3,704,000 |
Options exercised, total intrinsic value |  |  | 6,700,000 |  |
Total amount of cash received from exercise of options |  |  | 15,600,000 |  |
Employee stock purchase plan, number of offering (offering period) |  |  | 2 |  |
Employee stock purchase plan, offering period (months) |  |  | 6 months |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Compensation expense (income) | 100,000 | 100,000 | 300,000 | 300,000 |
Employee stock purchase plan, purchase price discount (percent) |  |  | 15.00% |  |
Stock Options [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Stock options, contractual term (years) |  |  | 10 years |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 3.00% |  |
Compensation expense (income) | 100,000 | (300,000) | 300,000 | 300,000 |
Stock Options [Member] | Employee Severance [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Compensation expense (income) |  | 200,000 |  |  |
Stock Options [Member] | Employee Severance [Member] | Modification of Stock Option Grant [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Compensation expense (income) |  | 700,000 |  |  |
Performance-Based Restricted Stock [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 7.00% |  |
Compensation expense (income) | 200,000 | 500,000 | 1,500,000 | 600,000 |
Restricted stock award program, measurement period (years) |  |  | 3 years |  |
Expected dividend yield (percent) |  |  | 0.00% | 0.00% |
Restricted stock award program, payment of award as percentage of target (percent) |  |  |  |  | 108.30%
Performance-Based Restricted Stock [Member] | Minimum [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 0.00% |  |
Performance-Based Restricted Stock [Member] | Maximum [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 200.00% |  |
Time Based Restricted Stock [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 7.00% |  |
Compensation expense (income) | 700,000 | 1,200,000 | 2,700,000 | 1,800,000 |
Restricted stock award program, vesting period (years) |  |  | 3 years |  |
Deferred Stock Units [Member] |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |
Compensation expense (income) | $ 0 | $ 0 | $ 800,000 | $ 700,000 |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Employee Stock Purchase Plan, Number of Offerings + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Target Award, Percentage + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeitures + References No definition available. + Details
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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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