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Earnings Per Common Share Basic and Diluted (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator-basic and diluted
Net income	$ 7,747	$ 15,325	$ 26,178	$ 34,583
Denominator
Weighted average number of common shares outstanding-basic	40,592	40,587	40,475	42,223
Effect of dilutive stock options	646	949	804	918
Effect of dilutive convertible notes	229	836	737	759
Effect of dilutive restricted shares	607	540	656	520
Weighted average number of common shares outstanding-diluted	42,074	42,912	42,672	44,420
Earnings per common share-basic	$ 0.19	$ 0.38	$ 0.65	$ 0.82
Earnings per common share-diluted	$ 0.18	$ 0.36	$ 0.61	$ 0.78
Antidilutive stock options and restricted shares	3,530	2,162	2,806	2,091

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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