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Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock-Based Compensation |  |  |
Number of stock-based compensation plans | 2 |  |
LTIP | Maximum |  |  |
Stock-Based Compensation |  |  |
Maximum grants of awards (in shares) | 3,000,000 |  |
Stock Option |  |  |
Stock-Based Compensation |  |  |
Exercisable period from date of grant | 10 years |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |
Volatility period over which the entity's common stock was traded | 4 years |  |
Risk-free interest rate (as a percent) | 1.00% |  | 2.40%
Expected dividend yield (as a percent) | 0.00% | 0.00% | 0.00%
Weighted average expected volatility (as a percent) | 50.00% | 50.00% | 49.00%
Expected term | 6 years |  | 6 years
Weighted average grant date fair value (in dollars per share) | $ 11.74 | $ 8.57 | $ 11.88
Options |  |  |
Outstanding at the beginning of the period (in shares) | 1,432,228 | 1,514,884 | 1,766,253
Granted (in shares) | 111,147 | 169,088 | 90,080
Exercised (in shares) | (390,652) | (245,054) | (332,099)
Forfeited (in shares) | (4,003) | (4,680) | (8,850)
Expired (in shares) | (1,400) | (2,010) | (500)
Outstanding at the end of the period (in shares) | 1,147,320 | 1,432,228 | 1,514,884
Exercisable at the end of the period (in shares) | 899,406 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 10.34 | $ 8.82 | $ 7.18
Granted (in dollars per share) | $ 24.68 | $ 17.76 | $ 24.18
Exercised (in dollars per share) | $ 5.90 | $ 5.78 | $ 4.12
Forfeited (in dollars per share) | $ 20.28 | $ 19.19 | $ 14.89
Expired (in dollars per share) | $ 15.96 | $ 18.85 | $ 13.00
Outstanding at the end of the period (in dollars per share) | $ 13.21 | $ 10.34 | $ 8.82
Exercisable at the end of the period (in dollars per share) | $ 10.91 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding at the end of the period | 5 years 1 month 6 days | 5 years 1 month 6 days | 5 years 6 months
Exercisable at the end of the period | 4 years 1 month 6 days |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period | $ 13,623 | $ 17,220 | $ 16,083
Exercisable at the end of the period | $ 12,742 |  |
Stock Option | Minimum |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |
Vesting period | 3 years |  |
Risk-free interest rate (as a percent) |  | 1.20% |
Expected term |  | 6 years |
Stock Option | Maximum |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |
Vesting period | 4 years |  |
Risk-free interest rate (as a percent) |  | 1.40% |
Expected term |  | 6 years 3 months 18 days |
Restricted Stock | Eligible members of the Board of Directors |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |
Vesting period | 3 years |  |
Restricted Stock | Minimum | Various employees |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |
Vesting period | 3 years |  |
Restricted Stock | Maximum | Various employees |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |
Vesting period | 5 years |  |

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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 Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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