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Stock-Based Compensation (Details) (Stock Option Plan [Member], USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock Option Plan [Member] |  |  |
Summary the stock option transactions |  |  |
Number of Options Outstanding | 260,660 | 303,632 | 391,948
Number of Options Granted | 0 | 0 | 0
Number of Options Exercised | (8,910,000) | (9,796,000) | 0
Number of Options Forfeited/canceled/Expired | (17,963) | (33,176) | (88,316)
Number of Options Outstanding | 233,787 | 260,660 | 303,632
Number of Options Vested and Exercisable | 233,787 |  |
Weighted Average Exercise Price, Outstanding | $ 34.69 | $ 37.40 | $ 38.78
Weighted Average Exercise Price, Granted | $ 0 | $ 0 | $ 0
Weighted Average Exercise Price, Exercised | $ 29.41 | $ 27.26 | $ 0
Weighted Average Exercise Price, Forfeited/canceled/expired | $ 54.35 | $ 61.69 | $ 43.50
Weighted Average Exercise Price, Outstanding | $ 33.38 | $ 34.69 | $ 37.40
Weighted Average Exercise Price Vested and Exercisable | $ 33.38 |  |
Weighted Average Remaining Contractual Term (Years) | 2 years 1 month 6 days | 3 years | 3 years 7 months 6 days
Weighted Average Remaining Contractual Term (Years) Vested and Exercisable | 2 years 1 month 6 days |  |
Aggregate Intrinsic Value Outstanding | $ 4,058,035 | $ 1,253,039 | $ 135,886
Aggregate Intrinsic Value Vested and Exercisable | $ 4,058,035 |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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