Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Long-term Debt and Capital Lease Obligations [Abstract]

Schedule of Long-Term Debt

Long-term debt, principally to banks and noteholders, consists of:

(in thousands, except interest rates)	2016		2015
Private placement with a fixed interest rate of 6.84%, due 2017	$50,000		$50,000
Revolving credit agreements with borrowings outstanding at an end of period interest rate of 2.58% in 2016 and 2.27% in 2015 (including the effect of interest rate hedging transactions, as described below), due in 2021	418,000		215,000
Obligation under capital lease, matures 2022	16,584		96
Long-term debt	484,584		265,096
Less: current portion	(51,666	)	(16	)
Long-term debt, net of current portion	$432,918		$265,080

Schedule of Future Minimum Annual Capital Lease Obilgations

The following schedule presents future minimum annual lease payments under the capital lease obligation and the present value of the minimum lease payments, as of December 31, 2016.

Years ending December 31,	(in thousands)
2017	$ 2,696
2018	2,743
2019	2,743
2020	2,790
2021	2,790
Thereafter	7,644
Total minimum lease payments	21,406
Less: Amount representing interest	(4,822)
Present value of minimum lease payments	$ 16,584