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Stock-Based Compensation Plans (Details) (USD $) | 12 Months Ended |  | 10 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Employee Stock Option Plan | Dec. 31, 2004 Employee Stock Option Plan | Dec. 31, 2002 Non-Employee Director Stock Option Plan | Dec. 31, 2012 Non-Employee Director Stock Option Plan | Dec. 31, 2013 Restricted Stock Plan [Member] | Dec. 31, 2012 Restricted Stock Plan [Member] | Dec. 31, 2011 Restricted Stock Plan [Member] | Dec. 31, 2010 Restricted Stock Plan [Member] | May 31, 2013 Employee Stock Purchase Plan [Member] | Dec. 31, 2013 Employee Stock Purchase Plan [Member] | Dec. 31, 2003 Employee Stock Purchase Plan [Member] | Dec. 31, 2013 Employee Stock Purchase Plan, 2003 [Member] | Dec. 31, 2012 Employee Stock Purchase Plan, 2003 [Member] | Dec. 31, 2011 Employee Stock Purchase Plan, 2003 [Member] | Dec. 31, 2013 Employee Stock Purchase Plan, 2013 [Member] | Dec. 31, 2012 Employee Stock Purchase Plan, 2013 [Member] | Dec. 31, 2011 Employee Stock Purchase Plan, 2013 [Member] | Dec. 31, 2013 Minimum Employee Stock Option Plan | Dec. 31, 2013 Minimum Restricted Stock Plan [Member] | Dec. 31, 2012 Minimum Restricted Stock Plan [Member] | Dec. 31, 2011 Minimum Restricted Stock Plan [Member] | Dec. 31, 2013 Maximum Employee Stock Option Plan | Dec. 31, 2013 Maximum Restricted Stock Plan [Member] | Dec. 31, 2012 Maximum Restricted Stock Plan [Member] | Dec. 31, 2011 Maximum Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options available for grant |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted net of shares from canceled/expired options |  |  |  | 15,723,739 |  | 549,240 | 84,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option vesting period |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  | 5 years |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Award Expiration Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  | 7 years |  |  |
Unrecognized compensation cost |  |  |  | $ 24,527,192 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for unrecognized compensation cost expected to be recognized |  |  |  | 2 years 2 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares approved |  |  |  |  |  |  | 500,000 |  |  |  | 2,000,000 |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option expiration period, years |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ESPP discount rate |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount recognized as compensation expense |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold to employees during period | 77,632 | 102,498 | 68,630 |  |  |  |  |  |  |  |  |  |  |  | 26,170 | 102,498 | 68,630 | 51,462 | 0 | 0 |  |  |  |  |  |  |  |
Cumulative shares sold to employees during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  | 51,462 |  |  |  |  |  |  |  |  |  |
Weighted average fair value of shares sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.01 |  |  | $ 22.64 |  |  |  |  |  |  |  |  |  |
Restricted period, maximum, in years |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted with restriction period | 187,090 | 225,730 | 140,900 |  |  |  |  | 768,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted period for granted shares, in years |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.23 | $ 17.27 | $ 24.96 |  | $ 32.83 | $ 24.45 | $ 30.25
Unearned stock-based compensation |  |  |  |  |  |  |  | 9,762,379 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  | $ 2,760,446 | $ 2,108,583 | $ 2,039,377 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Value of stock issued under share-based plans to employees or officers which is the unearned portion, accounted for under the fair value method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + 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 (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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