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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Components of Long-Term Debt
The Company's borrowings at December 31, 2016 and 2015 were as follows:
 
2016
 
2015
 
(Dollars in thousands)
Senior Credit Facility:
 
 
 
Revolving credit facility, at a rate of 2.27% at December 31, 2016 and 2.17% at December 31, 2015, due 2018
$
210,000

 
$
396,000

3.875% Convertible Senior Subordinated Notes due 2017
136,076

 
399,641

4.875% Senior Notes due 2026
400,000

 
—

5.25% Senior Notes due 2024
250,000

 
250,000

Securitization program, at a rate of 1.52% at December 31, 2016 and 1.18% at December 31, 2015
50,000

 
43,300

 
1,046,076

 
1,088,941

Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017
(2,707
)
 
(22,999
)
Less: Unamortized debt issuance costs
(10,046
)
 
(6,742
)
 
1,033,323

 
1,059,200

Current portion of borrowings
(183,071
)
 
(417,350
)
Long-term borrowings
$
850,252

 
$
641,850
Fair Value of Debt
The following table provides the fair value of the Company’s debt as of December 31, 2016 and 2015, categorized by the level of inputs within the fair value hierarchy used to measure fair value (see Note 10 to the consolidated financial statements for further information):
 
Fair value of debt
 
December 31, 2016
 
December 31, 2015
 
(Dollars in thousands)
Level 1
$
344,765

 
$
858,709

Level 2
929,362

 
687,072

Total
$
1,274,127

 
$
1,545,781
Aggregate Amounts of Long-Term Debt
Debt Maturities
As of December 31, 2016, the aggregate amounts of long-term debt, demand loans and debt under the Company’s securitization program that will mature during each of the next four years and thereafter were as follows:
 
(Dollars in thousands)
2017
$
186,076

2018
210,000

2019
—

2020
—

2021 and thereafter
650,000