EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Numerator for basic and diluted earnings per share:
Income from continuing operations		$ 29,156	$ 55,517	$ 51,886	$ 65,565
Income from discontinued operations			2,412		2,794
Net income		$ 29,156	$ 57,929	$ 51,886	$ 68,359
Denominator:
Basic shares outstanding (in shares)		52,939	52,581	52,869	52,542
Dilutive effect of equity-based compensation awards (in shares)		423	268	392	254
Dilutive shares outstanding (in shares)		53,362	52,849	53,261	52,796
Basic earnings per share:
Income from continuing operations (in dollars per share)		$ 0.55	$ 1.05	$ 0.98	$ 1.25
Income from discontinued operations, net of tax (in dollars per share)			$ 0.05		$ 0.05
Net income (in dollars per share)		$ 0.55	$ 1.10	$ 0.98	$ 1.30
Diluted earnings per share:
Income from continuing operations (in dollars per share)		$ 0.55	$ 1.05	$ 0.97	$ 1.24
Income from discontinued operations, net of tax (in dollars per share)			$ 0.05		$ 0.05
Net income (in dollars per share)		$ 0.55	$ 1.10	$ 0.97	$ 1.29
Authorized stock split declared, number of shares per each share held	2			2
Outstanding performance stock awards
Antidilutive securities
Antidilutive securities not included in calculation of earnings per share (in shares)		70	294	70	294
Stock options
Antidilutive securities
Antidilutive securities not included in calculation of earnings per share (in shares)			36		36

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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