Borrowings (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Components of Long-Term Debt

The Company's debt obligations at December 31, 2014 and 2013 are set forth in the following table:

	2014			2013
	(Dollars in thousands)
Senior Credit Facility:
Revolving credit facility, at a rate of 1.92% at December 31, 2014 and 2013, due July 16, 2018	$	200,000		$	680,000
3.875% Convertible Senior Subordinated Notes due 2017	399,898			400,000
6.875% Senior Subordinated Notes due 2019	250,000			250,000
5.25% Senior Notes due 2024	250,000			—
Securitization program, at a rate of 0.92% at December 31, 2014 and 2013	4,700			4,700
	1,104,598			1,334,700
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017	(36,197		)	(48,413		)
	1,068,401			1,286,287
Current borrowings	(368,401		)	(356,287		)
Long-term borrowings	$	700,000		$	930,000

Interest Expense Amounts Related to Convertible Notes

The following table provides interest expense amounts related to the Convertible Notes for the periods presented:

(in millions)	Year Ended December 31, 2014		Year Ended December 31, 2013		Year Ended December 31, 2012
Interest cost related to contractual interest coupon	$	15.5	$	15.5	$	15.5
Interest cost related to amortization of the discount	$	12.2	$	11.3	$	10.5

Carrying Value of Convertible Notes

The following table provides the carrying value of the Convertible Notes as of December 31, 2014 and 2013:

(in millions)	December 31, 2014			December 31, 2013
Principal amount of the Convertible Notes	$	399.9		$	400.0
Unamortized discount	(36.2		)	(48.4		)
Net carrying amount	$	363.7		$	351.6

Fair Value of Debt

The following table provides the fair value of the Company’s debt by fair value hierarchy level (see Note 10 to the consolidated financial statements for further information) as of December 31, 2014 and 2013:

	Fair value of debt
	December 31, 2014		December 31, 2013
	(Dollars in thousands)
Level 1	$	1,024,806	$	899,390
Level 2	455,222		648,712
Total	$	1,480,028	$	1,548,102

Aggregate Amounts of Long-Term Debt

As of December 31, 2014, 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 fiscal years and thereafter were as follows:

	(Dollars in thousands)
2015(1)	$	404,598
2016	—
2017	—
2018	200,000
2019 and thereafter	500,000

(1) The Convertible Notes are included in amounts that will mature in 2015 because, at December 31, 2014, they were convertible in accordance with their terms, which are described in more detail above in this section under “Convertible Notes.”