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Stock-Based Compensation (Additional Information) (Details) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 offering_periods | Jun. 30, 2013 | Jun. 30, 2014 Employee Stock Purchase Plan [Member] | Jun. 30, 2013 Employee Stock Purchase Plan [Member] | Jun. 30, 2014 Employee Stock Purchase Plan [Member] | Jun. 30, 2013 Employee Stock Purchase Plan [Member] | Jun. 30, 2014 Stock Options [Member] | Jun. 30, 2013 Stock Options [Member] | Jun. 30, 2014 Stock Options [Member] | Jun. 30, 2013 Stock Options [Member] | Jun. 30, 2014 Performance-Based Restricted Stock [Member] | Jun. 30, 2013 Performance-Based Restricted Stock [Member] | Jun. 30, 2014 Performance-Based Restricted Stock [Member] | Jun. 30, 2013 Performance-Based Restricted Stock [Member] | Dec. 31, 2013 Performance-Based Restricted Stock [Member] | Jun. 30, 2014 Performance-Based Restricted Stock [Member] Minimum [Member] | Jun. 30, 2014 Performance-Based Restricted Stock [Member] Maximum [Member] | Jun. 30, 2014 Time Based Restricted Stock [Member] | Jun. 30, 2013 Time Based Restricted Stock [Member] | Jun. 30, 2014 Time Based Restricted Stock [Member] | Jun. 30, 2013 Time Based Restricted Stock [Member] | Jun. 30, 2014 Deferred Stock Units [Member] | Mar. 31, 2014 Deferred Stock Units [Member] | Jun. 30, 2013 Deferred Stock Units [Member] | Mar. 31, 2013 Deferred Stock Units [Member] | Jun. 30, 2014 Deferred Stock Units [Member] | Jun. 30, 2013 Deferred Stock Units [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% |  |  |  | 7.00% |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |
Compensation expense (income) | $ 4,576,000 | $ 2,245,000 | $ 100,000 | $ 100,000 | $ 200,000 | $ 200,000 | $ 100,000 | $ 200,000 | $ 200,000 | $ 600,000 | $ 700,000 | $ 200,000 | $ 1,300,000 | $ 200,000 |  |  |  | $ 1,100,000 | $ 300,000 | $ 2,100,000 | $ 600,000 | $ 800,000 | $ 0 | $ 700,000 | $ 0 | $ 800,000 | $ 700,000
Options exercised, total intrinsic value | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount of cash received from exercise of options | $ 14,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock award program, measurement period (years) |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 200.00% |  |  |  |  |  |  |  |  |  |
Expected dividend yield (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock award program, payment of award as percentage of target (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108.30% |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock award program, vesting period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Employee stock purchase plan, number of offering (offering period) | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan, offering period (months) | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan, purchase price discount (percent) |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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