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Stock-Based Compensation Plans (Narrative) (Details) (USD $) | 12 Months Ended | 10 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Employee Stock Option Plan [Member] | Dec. 31, 2002 Non-Employee Director Stock Option Plan [Member] | Dec. 31, 2012 Non-Employee Director Stock Option Plan [Member] | Dec. 31, 2012 Non-Employee Director Stock Option Plan [Member] Amended & Restated Non-employee Director Stock Option Plan [Member] | Dec. 31, 2012 Employee Stock Purchase Plan [Member] | Dec. 31, 2003 Employee Stock Purchase Plan [Member] | Dec. 31, 2012 Restricted Stock Plan [Member] Y | Dec. 31, 2009 Restricted Stock Plan [Member] | Dec. 31, 2012 Minimum [Member] Employee Stock Option Plan [Member] | Dec. 31, 2012 Minimum [Member] Restricted Stock Plan [Member] | Dec. 31, 2011 Minimum [Member] Restricted Stock Plan [Member] | Dec. 31, 2010 Minimum [Member] Restricted Stock Plan [Member] | Dec. 31, 2012 Maximum [Member] Employee Stock Option Plan [Member] | Dec. 31, 2012 Maximum [Member] Restricted Stock Plan [Member] | Dec. 31, 2011 Maximum [Member] Restricted Stock Plan [Member] | Dec. 31, 2010 Maximum [Member] 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 |  |  |  | 13,366,722 | 549,240 | 42,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 17,583,516 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for unrecognized compensation cost expected to be recognized |  |  |  | 2 years 1 month 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares approved |  |  |  |  |  |  | 500,000 |  | 1,200,000 |  | 2,000,000 |  |  |  |  |  |  |  |
Option expiration period, years |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold to employees during period | 102,498 | 68,630 | 81,249 |  |  |  |  | 1,067,426 |  |  |  |  |  |  |  |  |  |  |
ESPP discount rate |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value of shares sold |  |  |  |  |  |  |  | $ 17.19 |  |  |  |  |  |  |  |  |  |  |
Restricted period, maximum, in years |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Shares granted with restriction period | 225,730 | 140,900 | 117,050 |  |  |  |  |  |  | 694,770 |  |  |  |  |  |  |  |  |
Restricted period for granted shares, in years |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Market price |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.27 | $ 24.96 | $ 17.98 |  | $ 24.45 | $ 30.25 | $ 29.46
Unearned stock-based compensation |  |  |  |  |  |  |  |  |  | 8,601,582 |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  | $ 2,108,583 |  |  |  |  |  |  |  |  |

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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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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