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Earnings Per Share Level 3 (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of earnings per common share and earnings per common share—assuming dilution:
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
| (Dollars in thousands, except per share data)
Numerator: |  |  |  |  |
Net income—numerator for earnings per common share | $ | 57,798 |  |  | $ | 86,248 |  |  | $ | 42,933 |
Interest on convertible subordinated debentures (net of income tax benefit) | 517 |  |  | 1,034 |  |  | 1,035 |
Numerator for earnings per common share—assuming dilution | $ | 58,315 |  |  | $ | 87,282 |  |  | $ | 43,968 |
Denominator: |  |  |  |  |
Weighted average common shares outstanding (1) | 61,258,825 |  |  | 59,482,349 |  |  | 58,506,804 |
Effect of dilutive securities: |  |  |  |  |
Convertible subordinated debentures | 1,348,447 |  |  | 2,727,084 |  |  | 2,729,514 |
Convertible senior notes | 2,515,067 |  |  | 848,164 |  |  | 2,904,571 |
Stock options and deferred compensation agreements | 553,312 |  |  | 561,898 |  |  | 438,834 |
Denominator for earnings per common share—assuming dilution | 65,675,651 |  |  | 63,619,495 |  |  | 64,579,723 |
Earnings per common share | $ | 0.94 |  |  | $ | 1.45 |  |  | $ | 0.73 |
Earnings per common share—assuming dilution | $ | 0.89 |  |  | $ | 1.37 |  |  | $ | 0.68 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | Options to purchase shares of our common stock that were outstanding during the respective periods indicated but were not included in the computation of diluted earnings per share because the options' exercise price was greater than the average market price of the common shares are as follows:
Period |  | Number of Shares |  | Range of Exercise Prices
|  |  |  | Minimum |  | Maximum
Year ended December 31, 2012 |  | 1,522,100 |  |  | $11.35 |  | $14.34
Year ended December 31, 2011 |  | 2,290,200 |  |  | $10.65 |  | $14.34
Year ended December 31, 2010 |  | 1,945,500 |  |  | $8.75 |  | $14.34

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -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 Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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