Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Sales
Sales	$ 1,182,841	$ 974,443
Costs and expenses
Materials, labor, and other operating expenses (excluding depreciation)	1,009,778	846,759
Depreciation and amortization	22,111	19,344
Selling and distribution expenses	83,356	73,679
General and administrative expenses	15,886	13,571
Other (income) expense, net	(94)	(35)
Total costs and expenses	1,131,037	953,318
Income from operations	51,804	21,125
Foreign currency exchange gain (loss)	(263)	28
Pension expense (excluding service costs)	(244)	(31)
Interest expense	(6,362)	(6,364)
Interest income	264	33
Change in fair value of interest rate swaps	1,641	295
Total nonoperating income (expense)	(4,964)	(6,039)
Income before income taxes	46,840	15,086
Income tax provision	(9,790)	(5,066)
Net income	$ 37,050	$ 10,020
Weighted average common shares outstanding:
Basic (in shares)	38,778	38,500
Diluted (in shares)	39,396	38,901
Net income per common share:
Basic (in dollars per share)	$ 0.96	$ 0.26
Diluted (in dollars per share)	$ 0.94	$ 0.26

Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest costs, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.

No definition available.