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Stockholders' Equity and Stock-Based Compensation Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 3 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Stock Options [Member] Stock_Plan Executives Directors | Mar. 31, 2012 Stock Options [Member] | Mar. 31, 2013 Phantom Share Units PSUs [Member] | Mar. 31, 2012 Phantom Share Units PSUs [Member] | Mar. 31, 2013 Minimum [Member] Stock Options [Member] | Mar. 31, 2013 Minimum [Member] Phantom Share Units PSUs [Member] | Mar. 31, 2013 Maximum [Member] Stock Options [Member] | Mar. 31, 2013 Maximum [Member] Phantom Share Units PSUs [Member]
Stockholders' Equity and Stock-Based Compensation Plans (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Number of active stock option plans |  |  | 5 |  |  |  |  |  |  |
Number of active stock option plans for employees |  |  | 2 |  |  |  |  |  |  |
Number of active stock option plans for non-employee directors |  |  | 1 |  |  |  |  |  |  |
Number of active stock option plans for key executives |  |  | 1 |  |  |  |  |  |  |
Range of stock vesting period |  |  |  |  |  |  | 24 months | 11 months | 6 years | 4 years
Expiration term for stock granted |  |  | 10 years |  | 10 years |  |  |  |  |
Aggregate number of shares of common stock reserved for issuance which can be granted |  |  | 2,640,000 |  |  |  |  |  |  |
Number exercisable and fully vested |  |  | 193,668 |  |  |  |  |  |  |
Fully vested stock options with performance conditions attached |  |  | 100,664 |  | 150,308 |  |  |  |  |
Total compensation cost of SEUs |  |  | $ 0.7 | $ 0.8 | $ 3.7 | $ 1.9 |  |  |  |
Total compensation cost related to non-vested stock options not yet recognized |  |  | 3.2 |  |  |  |  |  |  |
Expected compensation cost recognized over the weighted average period |  |  | 2 years 26 days |  | 1 year 5 months 9 days |  |  |  |  |
Total intrinsic value of options exercised |  |  | $ 1.9 | $ 0.1 | $ 1.2 | $ 0.5 |  |  |  |
Number of exercisable SEUs |  |  |  |  | 185,451 |  |  |  |  |
Stockholders' Equity and Stock-Based Compensation Plans (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 40,000,000 | 40,000,000 |  |  |  |  |  |  |  |
Number of shares issued | 29,554,500 | 29,554,500 |  |  |  |  |  |  |  |
Treasury stock, shares | 6,054,840 | 6,222,076 |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -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 3: 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.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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