Incentive Plans (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Incentive Plans (Textual)
Equity award expense	$ 12,154	$ 11,216
Unrecognized compensation cost	$ 34,200
Weighted average period	2 years 10 months 24 days
Share-based Compensation, descriptions	Restricted stock grants generally vest (i) 100% on the fourth or fifth anniversary of the grant, (ii) ratably over three or four years or (iii) over ten years at 20% per year commencing after the fifth year.
Minimum [Member]
Incentive Plans (Textual)
Stock option vesting period	3 years
Minimum [Member] \| Performance Shares [Member]
Incentive Plans (Textual)
Stock option vesting period	1 year
Maximum [Member]
Incentive Plans (Textual)
Stock option vesting period	5 years
Maximum [Member] \| Performance Shares [Member]
Incentive Plans (Textual)
Stock option vesting period	3 years
Prior Plan [Member]
Incentive Plans (Textual)
Common stock issued under incentive plans	47,000,000
2010 Plan [Member]
Incentive Plans (Textual)
Common stock issued under incentive plans	10,000,000

Incentive Plans.

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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

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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

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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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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

+ References

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-Publisher FASB

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-Topic 718

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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

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