The Company's long-term debt instruments and balances outstanding as of September 30, 2013 and 2012 and December 31, 2012 were as follows (dollars in thousands):

	Balance as of
	September 30,				December 31,
	2013		2012		2012
Domestic and multi-currency line of credit due 2018	$	120,225	$	288,266	$	301,011
6.12% senior unsecured notes due 2012		-		13,333		-
6.09% Series A senior unsecured notes due 2016		28,000		35,000		28,000
7.26% senior unsecured notes due 2017		20,000		25,000		25,000
Variable rate senior unsecured notes due 2018		35,417		43,750		41,667
5.75% senior unsecured notes due 2018		300,000		0		0
6.00% Series A senior unsecured notes due 2019		47,000		47,000		47,000
6.21% Series B senior unsecured notes due 2021		20,455		22,727		20,455
6.58% Series B senior unsecured notes due 2022		5,000		5,000		5,000
5.25% convertible senior notes due 2029		106,752		109,387		110,197
Total debt	$	682,849	$	589,463	$	578,330
Less current portion		(22,606)		(44,205)		(43,617)
Total long-term debt	$	660,243	$	545,258	$	534,713

The Company's domestic and multi-currency line of credit, which includes the ability to borrow up to $50.0 million in specified foreign currencies or U.S. dollars (the “Domestic and Multi-currency Line of Credit”), was amended by the Company on May 10, 2013. The primary provisions of the amendment to the Domestic and Multi-currency Line of Credit include an extension of the maturity date from March 31, 2015 to March 31, 2018 and a decrease in the total credit available from $380.0 million to $280.0 million, subject to an accordion feature whereby the revolving line of credit may be increased up to an additional $100.0 million with the consent of any increasing lenders. Interest on the Domestic and Multi-currency Line of Credit is charged, at the Company's option, at either the London Interbank Offered Rate for one-, two-, three- or six-month periods, as selected by the Company for the first interest rate period, and for subsequent interest rate periods, one week or two weeks or one-, two-, three- or six-month periods, as selected by the Company (“LIBOR”), plus a margin varying from 2.00% to 3.25% or at the agent's base rate plus a margin varying from 0.50% to 1.75%. The margin for the Domestic and Multi-currency Line of Credit is dependent on the Company's cash flow leverage ratios as defined in the credit agreement entered into in connection with the Domestic and Multi-currency Line of Credit. The Company also pays a fee on the unused portion of the Domestic and Multi-currency Line of Credit ranging from 0.25% to 0.50% (0.38% as of September 30, 2013) based on the Company's cash flow leverage ratios. The weighted average interest rate (including margin) on the Domestic and Multi-currency Line of Credit was 2.81%, 2.75% and 3.06% as of September 30, 2013 and 2012 and December 31, 2012, respectively.

As of September 30, 2013, borrowings under the Company's Domestic and Multi-currency Line of Credit consisted of three pricing tranches with maturity dates ranging from one to 31 days, and as of September 30, 2012, borrowings under the Company's Domestic and Multi-currency Line of Credit consisted of three pricing tranches with maturity dates ranging from two to 31 days. The Company routinely refinances borrowings pursuant to the terms of its Domestic and Multi-currency Line of Credit; therefore, these borrowings are reported as part of the applicable line of credit and as long-term debt.

When the Company amended its Domestic and Multi-currency Line of Credit, it also extended the maturity date of its $50.0 million variable rate term loan facility (the “2018 Variable Rate Notes”) from March 31, 2015 to March 31, 2018. The 2018 Variable Rate Notes are payable in equal quarterly principal installments of $2.1 million with any outstanding principal remaining due at maturity on March 31, 2018. Interest on the 2018 Variable Rate Notes is charged, at the Company's option, at either LIBOR (as defined above) plus a margin of 3.50% or at the agent's base rate plus a margin of 2.00%. The weighted average interest rate (including margin) on the 2018 Variable Rate Notes was 3.69% for September 30, 2013 and 3.75% as of each of September 30, 2012 and December 31, 2012.

In connection with the amendment of the Domestic and Multi-currency Line of Credit and the 2018 Variable Rate Notes, the Company incurred debt issuance costs of approximately $1.8 million during the nine months ended September 30, 2013, which primarily consisted of commitment fees, legal and other professional expenses. These costs are being amortized over a period of five years and are included in “Other assets” in the Company's consolidated balance sheets.

On May 15, 2013, the Company issued and sold $300.0 million in aggregate principal amount of 5.75% Senior Notes due 2018 (the “2018 Senior Notes”). The Company offered and sold the 2018 Senior Notes to initial purchasers in reliance on the exemption from registration provided by Section 4(2) of the Securities Act of 1933, as amended (the “Securities Act”). The initial purchasers then resold the 2018 Senior Notes pursuant to the exemptions from registration under the Securities Act in reliance on Rule 144A and Regulation S. The 2018 Senior Notes bear interest at a rate of 5.75% annually on the principal amount, payable semi-annually in arrears on May 15 and November 15 of each year, beginning on November 15, 2013. The 2018 Senior Notes will mature on May 15, 2018. The 2018 Senior Notes are senior unsecured debt obligations of the Company and are guaranteed by all of the Company's domestic subsidiaries.

The 2018 Senior Notes are redeemable at the Company's option, in whole or in part, at any time at 100% of the aggregate principal amount of 2018 Senior Notes redeemed plus the applicable “make whole” redemption price specified in the Indenture that governs the 2018 Senior Notes (the “2018 Senior Notes Indenture”), plus accrued and unpaid interest, if any, to the redemption date. In addition, if a change of control occurs, as that term is defined in the 2018 Senior Notes Indenture, the holders of 2018 Senior Notes will have the right, subject to certain conditions, to require the Company to repurchase their 2018 Senior Notes at a purchase price equal to 101% of the aggregate principal amount of 2018 Senior Notes repurchased plus accrued and unpaid interest, if any, as of the date of repurchase.

In addition, on May 15, 2013 the Company entered into a registration rights agreement with the initial purchasers (the “Registration Rights Agreement”) of the 2018 Senior Notes, pursuant to which the Company agreed to use commercially reasonable efforts to issue in exchange for the 2018 Senior Notes, on or prior to the 270th day following the closing date of the issuance and sale of the 2018 Senior Notes, identical new notes registered under the Securities Act. In certain circumstances, the Company may be required to file a shelf registration statement to cover resales of the 2018 Senior Notes. If the Company does not comply with certain covenants set forth in the Registration Rights Agreement, it must pay liquidated damages to holders of the 2018 Senior Notes.

In connection with the issuance of the 2018 Senior Notes, the Company incurred debt issuance costs of approximately $8.1 million during the nine months ended September 30, 2013, which primarily consisted of underwriting fees, legal and other professional expenses. These costs are being amortized over a period of five years and are included in “Other assets” in the Company's consolidated balance sheets.

When the Company entered into its Domestic and Multi-currency Line of Credit, it also entered into a separate credit agreement for the issuance of up to $20.0 million in letters of credit (the “Letter of Credit Facility”). When the Company amended its Domestic and Multi-currency Line of Credit, it also extended the maturity date of its Letter of Credit Facility from March 31, 2015 to March 31, 2018. The Company had standby letters of credit of $16.3 million under its Letter of Credit Facility as of September 30, 2013.

The Company's debt agreements for its Domestic and Multi-currency Line of Credit and its senior unsecured notes require the Company to maintain certain financial ratios. As of September 30, 2013, the Company was in compliance with all covenants or other requirements set forth in its debt agreements.