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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

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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.

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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.

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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)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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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.

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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 (a)(1)

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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).

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-Topic 718

-SubTopic 10

-Section 50

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Stock Incentive Plans (Details Textuals) (USD $)	12 Months Ended
Stock Incentive Plans (Details Textuals) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Incentive Plans (Textuals) [Abstract]
Expected recognized period	2 years
Stock-based compensation expense	$ 32,075,000us-gaap_ShareBasedCompensation	$ 20,177,000us-gaap_ShareBasedCompensation	$ 18,521,000us-gaap_ShareBasedCompensation
Employee Stock Option [Member]
Stock Incentive Plans (Textuals) [Abstract]
Number of common stock authorized for Long-Term Incentive Plan	19,358,000
Stock Incentive Plan [Member]
Stock Incentive Plans (Textuals) [Abstract]
Number of common stock authorized for Long-Term Incentive Plan	6,200,000
Stock Incentive Plan [Member] \| Director [Member] \| Maximum [Member]
Stock Incentive Plans (Textuals) [Abstract]
Vesting period		3 years
Stock Incentive Plan [Member] \| Director [Member] \| Minimum [Member]
Stock Incentive Plans (Textuals) [Abstract]
Vesting period		1 year
Stock Incentive Plan [Member] \| Officer [Member] \| Maximum [Member]
Stock Incentive Plans (Textuals) [Abstract]
Vesting period		5 years
Stock Incentive Plan [Member] \| Officer [Member] \| Minimum [Member]
Stock Incentive Plans (Textuals) [Abstract]
Vesting period		3 years
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	1,147,000
Vesting period	10 years
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	$ 30,692,000