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Earnings Per Share Level 4 (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic and Dilutive [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			10,000,000
Net Income	$ 26,031,000	$ 10,471,000
Interest Expense, Subordinated Notes and Debentures	0	258,000
Net Income (Loss) Available to Common Stockholders, Diluted	26,031,000	10,729,000
Weighted Average Number of Shares Outstanding, Basic	63,313,568	59,700,537	63,313,568	59,700,537
Incremental Common Shares Attributable to Share-based Payment Arrangements	908,853	626,622
Weighted Average Number of Shares Outstanding, Diluted	68,705,913	65,930,309	68,705,913	65,930,309
Earnings Per Share, Basic	$ 0.41	$ 0.18
Earnings Per Share, Diluted	$ 0.38	$ 0.16
Convertible Subordinated Debt [Member]
Earnings Per Share, Basic and Dilutive [Line Items]
Incremental Common Shares Attributable to Conversion of Debt Securities	0	2,883,310
Convertible Notes Payable [Member]
Earnings Per Share, Basic and Dilutive [Line Items]
Incremental Common Shares Attributable to Conversion of Debt Securities	4,483,492	2,719,840
Stock Options [Member]
Earnings Per Share, Basic and Dilutive [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,200	1,499,900
Minimum [Member]
Earnings Per Share, Basic and Dilutive [Line Items]
Stock Options, Excluded from Diluted Earnings per Share, Range of Exercise Prices	14.34	11.88
Maximum [Member]
Earnings Per Share, Basic and Dilutive [Line Items]
Stock Options, Excluded from Diluted Earnings per Share, Range of Exercise Prices	$ 14.62	$ 14.34

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