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Capital Structure and Per Share Data (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 Vote | Dec. 31, 2011 | Dec. 31, 2010
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Preferred stock shares authorized | 3,000,000 |  |
Number of classes of common stock | 2 |  |
Stated Interest rate on debt agreement | 5.00% | 5.00% |
Capital Structure and Per Share Data (Additional Textual) [Abstract] |  |  |
Preferred stock, issued | 0 | 0 |
Preferred stock, outstanding | 0 | 0 |
5.0% Convertible Senior Notes [Member] |  |  |
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Stated Interest rate on debt agreement | 5.00% |  |
Class A Convertible Preferred Stock [Member] |  |  |
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Preferred stock shares authorized | 300,000 |  |
Preferred stock par value | $ 0.10 |  |
Class A convertible preferred stock redemption price | $ 1,000 |  |
Class A convertible preferred stock shares redeemed | 13,802 |  |
Series I Preferred Stock [Member] |  |  |
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Class A Convertible Preferred Stock Shares Authorized | 100,000 |  |
Series II Preferred Stock [Member] |  |  |
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Class A Convertible Preferred Stock Shares Authorized | 100,000 |  |
Series III Preferred Stock [Member] |  |  |
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Class A Convertible Preferred Stock Shares Authorized | 100,000 |  |
Common Class A [Member] |  |  |
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |
Common stock, shares authorized | 100,000,000 | 100,000,000 |
Common stock, number of votes per share | 1 |  |
Number of shares of class A common stock issuable against each share of class B common stock | 1 |  |
Authorized amount expend on repurchase of shares | $ 395.0 |  |
Common stock class A, shares repurchased | 20,100,000 |  |
Common stock class A, share repurchase price per share | $ 16.46 |  |
Remaining authorized amount | $ 49.6 |  |
Antidilutive stock options excluded in computation of diluted earnings per share | 1,000,000 | 1,900,000 | 2,300,000
Common Class B [Member] |  |  |
Capital Structure and Per Share Data (Textual) [Abstract] |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |
Common stock, shares authorized | 30,000,000 | 30,000,000 |
Common stock, number of votes per share | 10 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -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 -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -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 6: 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. Reference 7: 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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 -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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