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Stock Options, Restricted Stock and Restricted Stock Units (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Dec. 31, 2013 | Apr. 30, 2011 1996 Equity Compensation Plan [Member] | Apr. 30, 2011 2011 Equity Compensation Plan [Member] | May 31, 2013 Restricted Stock [Member] | Mar. 31, 2013 Restricted Stock [Member] | Feb. 28, 2013 Restricted Stock [Member] | May 31, 2013 Restricted Stock [Member] Non-employee [Member] | Feb. 28, 2013 Minimum [Member] Restricted Stock [Member] | Feb. 28, 2013 Maximum [Member] Restricted Stock [Member]
Stock Options and Restricted Stock (Textual) |  |  |  |  |  |  |  |  |
Shares approved for grants |  |  |  | 43,659 |  | 165,712 | 16,370 |  |
Shares available for grant |  | 350,000 | 300,000 |  |  |  |  |  |
Vesting period, years |  |  |  | 4 years |  |  | 3 years | 3 years | 5 years
Closing price of stock on date of stock grant |  |  |  |  |  | $ 62.28 | $ 45.81 |  |
Restricted shares converted to restricted stock units |  |  |  |  | 200,000 |  |  |  |
Maximum term of the awards granted under the Plan | 10 years |  |  |  |  |  |  |  |
Stock-based compensation cost which has not yet been recognized | $ 34.5 |  |  |  |  |  |  |  |
Stock-based compensation cost recognized period, in months | 54 months |  |  |  |  |  |  |  |
Restricted stock awarded subject to performance condition | 351,000 |  |  |  |  |  |  |  |
Number of shares not meeting performance criteria | 45,920 |  |  |  |  |  |  |  |
Reduction in stock based compensation | $ 7.0 |  |  |  |  |  |  |  |

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- Definition Maximum term of the awards granted under the plan. + References No definition available. + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + 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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