Cash paid for regular RSU vesting and dividend payments.

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- Definition

Compensation expense, restricted stock.

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Estimate of future expense for all types of RSUs outstanding.

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- Definition

Exercise period of stock option after Employee termination.

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- Definition

Number of company type awards to key employees.

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- Definition

Number of trailing months used as basis of second RSU.

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No definition available.

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- Definition

Payout per unit average 30 days closing price.

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- Definition

Payout range maximum.

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Payout range minimum.

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- Definition

Recognition Period of Future Compensation Expense Over Weighted Average

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No definition available.

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- Definition

Recognized compensation expense related to RSUs for employees and directors, before capitalization or income tax benefit, if any.

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No definition available.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Amended Award Vesting Date

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Award Cliff Vesting Period

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- Definition

Share based compensation arrangement by share based payment award options outstanding.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ 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 (h)(1)(i)

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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

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-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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- Definition

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.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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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- 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.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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- 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.

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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

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

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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.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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- Definition

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Equity and Stock-Based Compensation (Stock-Based Compensation Textuals) (Details) (USD $)	0 Months Ended	12 Months Ended
	Feb. 15, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plan (shares)		1,720,835
Stock options outstanding (number of options)		4,429,000	5,960,000
Number of trailing months used as basis of second RSU (months)				12 months
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (number of options)		4,428,562
Term life of stock options (years)		P10Y
Vesting period of restricted stock units (in years)		4 years
Exercise period of option after employee termination (in years)		1 year
Compensation expense, options		$ 310,000	$ 941,000	$ 1,600,000
Additional compensation expense in connection with retirement of executives		110,000
Unrecognized compensation cost		410,000
Recognition period of future compensation expense over weighted average (in years)		1 year 9 months 18 days
Cash proceeds from the exercise of stock options		45,000
Fair value of options exercisable		243,000
Weighted average contractual life of outstanding options (in years)		3 years 6 months
Weighted average contractual life of exercisable options (in years)			3 years 3 months 18 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of restricted stock units (in years)	4 years	3 years	3 years
Unrecognized compensation cost		2,600,000
Number of restricted stock units granted		470,000
Cliff vesting period (in years)	3 years		3 years
Compensation expense, restricted stock		1,800,000	1,200,000	747,000
Unrecognized compensation cost, period for recognition (in years)		1 year 10 months 24 days
Total fair value of the restricted stock which vested		1,200,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of restricted stock units (in years)		4 years
Unrecognized compensation cost, period for recognition (in years)		3 years
Total cash paid for regular RSU vesting and dividend payments		294,000
Payout range minimum		0.00%
Payout range maximum		150.00%
Payout per unit average 30 days closing price (days)		30 days
Recognized compensation expense related to RSUs for employees and directors, before capitalization or income tax benefit, if any		2,500,000	1,000,000	1,400,000
Estimate of future expense for all types of RSUs outstanding		4,700,000
Performance-based RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted		546,000
Number of company type awards to key employees (award plans)				2
Performance based RSUs outstanding (shares)		281,532
Payout range minimum		0.00%	0.00%	0.00%
Payout range maximum		200.00%	200.00%	200.00%
Award vesting date				Feb. 15, 2013
Payout per unit average 30 days closing price (days)		30 days	30 days	30 days
SNL RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based RSUs outstanding (shares)		137,609	77,306
FFO RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based RSUs outstanding (shares)		86,060	49,697
MSCI RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based RSUs outstanding (shares)		61,464
EBITDA RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based RSUs outstanding (shares)		85,427
Long-term incentive compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, options		$ 101,000	$ (767,000)	$ 805,000
Other Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted		470,306	214,206
Three years from grant date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted			29,411
Three years from grant date [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted		56,845	20,368
Immediately on the grant date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted		25,442
Four years from grant date [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units granted		401	21,442
Cliff vesting period (in years)		3 years