| Revenues | 1,823,889a | 1,563,548a | 1,301,674a |
| Cost of revenues | -1,565,635a | -1,367,163a | -1,162,372a |
| Gross profit | 258,254a | 196,385a | 139,302a |
| General and administrative expenses | -151,497a | -126,947a | -107,562a |
| Gain on sale of property, plant and equipment | 4,483a | 7,048a | 3,673a |
| Gain on facility exchange | | 5,389a | |
| Operating income | 111,240a | 81,875a | 35,413a |
| Interest expense, net | -19,071a | -17,346a | -7,701a |
| Other (expense) income | -70a | 875a | 600a |
| Income before provision for income taxes and earnings from investment in joint venture | 92,099a | 65,404a | 28,312a |
| Provision for income taxes | -23,161a | -16,403a | -6,915a |
| Loss from investment in joint venture | -3a | | -21a |
| Net income | 68,935a | 49,001a | 21,376a |