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Stock Options, Restricted Stock and Restricted Stock Units (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended | 1 Months Ended |  | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Feb. 28, 2014 Board of Directors [Member] | May 31, 2014 Board of Directors [Member] Vesting over four years [Member] | May 31, 2014 Board of Directors [Member] Vesting over three years [Member] | Apr. 30, 2011 1996 Equity Compensation Plan [Member] | Apr. 30, 2011 2011 Equity Compensation Plan [Member] | Jun. 30, 2014 Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  | 350,000 | 300,000 |
Shares approved for grants |  |  | 46,064 | 46,674 | 15,868 |  |  |
Vesting period, years |  |  |  | 4 years | 3 years |  |  |
Vesting percentage |  |  | 100.00% |  |  |  |  |
Vesting date |  |  | Feb. 28, 2018 |  |  |  |  |
Closing price of stock on date of stock grant |  |  | $ 33.65 |  | $ 42.85 |  |  |
Maximum term of the awards granted under the Plan | 10 years |  |  |  |  |  |  |
Stock-based compensation cost which has not yet been recognized | $ 33.6 |  |  |  |  |  |  |
Stock-based compensation cost recognized period, in months | 47 months |  |  |  |  |  |  |
Tax shortfall related to share-based payment arrangements | $ 1.8 | $ 3.5 |  |  |  |  |  |
Restricted stock awarded subject to performance condition | 398,000 |  |  |  |  |  |  |
Number of stock options, exercised |  |  |  |  |  |  |  |

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- Definition Excess tax shortfall resulting from increases in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return does not exceed compensation cot from equity based compensation recognized in financial statements. Excess tax benefits resulting from decreases in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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