Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Basic net income per share:
Net income	$ 44,294	$ 67,213	$ 114,771	$ 109,395
Weighted average number of common shares outstanding	48,419,556	50,296,209	48,342,756	50,422,564
Basic net income per share	$ 0.91	$ 1.34	$ 2.37	$ 2.17
Diluted net income per share:
Net income	44,294	67,213	114,771	109,395
Weighted average number of common shares outstanding	48,419,556	50,296,209	48,342,756	50,422,564
Dilutive effect of stock options and non-vested stock awards	1,764,664	1,021,835	1,813,532	813,375
Dilutive effect of assumed conversion of the 2.0% Convertible Senior Notes	2,196,048		1,818,377
Dilutive effect of warrants	1,161,100		683,638
Weighted average number of common shares and dilutive potential common shares outstanding	53,541,368	51,318,044	52,658,303	51,235,939
Diluted net income per share	$ 0.83	$ 1.31	$ 2.18	$ 2.14
Earnings per Share (Textuals)
Antidilutive common stock shares	4,835	883,010	2,431	1,525,327
Convertible senior notes principal outstanding	$ 260,000	$ 260,000	$ 260,000	$ 260,000
Interest rate of convertible senior notes	2.00%		2.00%

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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