Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table sets forth the computation of earnings per common share and earnings per common share—assuming dilution:

	Year Ended December 31,
	2014		2013		2012
	(Dollars in thousands, except per share data)
Numerator:
Net income—numerator for earnings per common share	$	126,023	$	253,283	$	57,798
Interest on convertible subordinated debentures (net of income tax benefit)	—		—		517
Numerator for earnings per common share—assuming dilution	$	126,023	$	253,283	$	58,315
Denominator:
Weighted average common shares outstanding (1)	74,431,087		65,543,895		61,258,825
Effect of dilutive securities:
Convertible subordinated debentures	—		—		1,348,447
Convertible senior notes	2,657,158		7,088,149		2,515,067
2015 warrants	1,559,646		1,184,549		—
Stock options and deferred compensation agreements	1,178,783		1,224,053		553,312
Restricted stock and restricted stock units	66,926		—		—
Denominator for earnings per common share—assuming dilution	79,893,600		75,040,646		65,675,651
Earnings per common share	$	1.69	$	3.86	$	0.94
Earnings per common share—assuming dilution	$	1.58	$	3.38	$	0.89

(1) Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

Options to purchase shares of our common stock that were outstanding during the respective periods indicated but were not included in the computation of diluted earnings per share because the options' exercise price was greater than the average market price of the common shares are as follows:

Period	Number of Shares	Range of Exercise Prices
		Minimum	Maximum
Year ended December 31, 2014	1,215,450	$24.79	$24.79
Year ended December 31, 2013	—	—	—
Year ended December 31, 2012	1,522,100	$11.35	$14.34