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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ 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 (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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)

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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)

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1)

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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)

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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Stock Incentive Plans (Details Textuals) (USD $)	12 Months Ended
Stock Incentive Plans (Details Textuals) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Incentive Plans (Textuals) [Abstract]
Aggregate intrinsic value of options exercised under stock incentive plans	$ 5,160,000	$ 6,186,000	$ 3,390,000
Cash received from option exercises under stock incentive plans	9,069,000	13,949,000	8,628,000
Stock-based compensation expense	20,177,000	18,521,000	10,786,000
Director [Member]
Stock Incentive Plans (Textuals) [Abstract]
Vesting period	3 years 0 months
Officer [Member]
Stock Incentive Plans (Textuals) [Abstract]
Vesting period	5 years 0 months
Stock Incentive Plan [Member]
Stock Incentive Plans (Textuals) [Abstract]
Number of common stock authorized for Long-Term Incentive Plan	6,200,000
Employee Stock Option [Member] \| Employee Stock Option [Member]
Stock Incentive Plans (Textuals) [Abstract]
Unrecognized compensation cost related to unvested stock options granted stock under our stock incentive plans	2,073,000
Vesting period	10 years 0 months
Restricted Stock [Member]
Stock Incentive Plans (Textuals) [Abstract]
Unrecognized compensation cost related to unvested stock options granted stock under our stock incentive plans	0
Expected recognized period	3 years 0 months
Restricted Stock [Member] \| Stock Option Restricted Stock Deferred Stock Units And Dividend Equivalent Rights [Member]
Stock Incentive Plans (Textuals) [Abstract]
Unrecognized compensation cost related to unvested stock options granted stock under our stock incentive plans	$ 24,923,000