EXHIBIT 12

STATEMENT OF COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (1) 

Our ratio of earnings to fixed charges for the each of the years ended December 31, 2017, 2016, 2015, 2014, and 2013 were as follows:
 
 
Years Ended December 31,
(In Thousands, Except Ratios)
 
2017
 
2016
 
2015
 
2014
 
2013
Net income before provision for income taxes
 
$
152,158

 
$
134,960

 
$
91,742

 
$
101,313

 
$
184,194

Interest expense on asset-backed securities
 
19,108

 
14,735

 
21,469

 
31,227

 
39,716

Interest expense on long-term debt
 
52,857

 
51,506

 
43,842

 
30,246

 
23,819

Interest expense on convertible debt maturing in less than one year
 
8,836

 
—

 
—

 
—

 
—

Earnings available to cover fixed charges
 
$
232,959

 
$
201,201

 
$
157,053

 
$
162,786

 
$
247,729

 
 
 
 
 
 
 
 
 
 
 
Fixed charges:
 
 
 
 
 
 
 
 
 
 
Interest expense on asset-backed securities
 
$
19,108

 
$
14,735

 
$
21,469

 
$
31,227

 
$
39,716

Interest expense on long-term debt
 
52,857

 
51,506

 
43,842

 
30,246

 
23,819

Interest expense on convertible debt maturing in less than one year
 
8,836

 
—

 
—

 
—

 
—

Total fixed charges
 
$
80,801

 
$
66,241

 
$
65,311

 
$
61,473

 
$
63,535

Ratio of Earnings to Fixed Charges
 
2.88

 
3.04

 
2.40

 
2.65

 
3.90

 
 
 
 
 
 
 
 
 
 
 
(1)
The ratio of earnings to fixed charges represents the number of times “fixed charges” are covered by “earnings.” “Fixed charges” consist of interest on outstanding long-term debt, convertible notes with a maturity of less than one year, and asset-backed securities issued, as well as associated amortization of debt discount and deferred issuance costs. The proportion deemed representative of the interest factor of operating lease expense has not been deducted as the total operating lease expense in itself was de minimis and did not affect the ratios in a material way. “Earnings” consist of consolidated income before income taxes and fixed charges.