Income Taxes	9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	The Company’s income tax rate for the three and nine months ended September 30, 2017 was higher than the U.S. federal statutory rate of 35.0% primarily due to state income taxes and certain expenses that are not deductible for the purposes of income taxes, partially offset by benefits from tax credits, the manufacturing deduction, and tax deductions from vesting of restricted stock units in excess of the book deductions. The Company's income tax rate for the three months ended September 30, 2016 was higher than the U.S. federal statutory rate of 35.0% primarily due to state income taxes, certain expenses that are not deductible for the purposes of income taxes and a decrease to the manufacturing deduction, partially offset by benefits from tax credits. The Company’s income tax rate for the nine months ended September 30, 2016 was higher than the U. S federal statutory rate of 35.0% primarily due to state income taxes and certain expenses that are not deductible for the purposes of income taxes, partially offset by benefits from tax credits, the manufacturing deduction, and a $3.1 million tax benefit resulting from tax deductions from vesting restricted stock units in excess of the book deductions that were recognized upon our adoption of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting.

The Company’s income tax rate for the three and nine months ended September 30, 2017 was higher than the U.S. federal statutory rate of 35.0% primarily due to state income taxes and certain expenses that are not deductible for the purposes of income taxes, partially offset by benefits from tax credits, the manufacturing deduction, and tax deductions from vesting of restricted stock units in excess of the book deductions.

The Company's income tax rate for the three months ended September 30, 2016 was higher than the U.S. federal statutory rate of 35.0% primarily due to state income taxes, certain expenses that are not deductible for the purposes of income taxes and a decrease to the manufacturing deduction, partially offset by benefits from tax credits. The Company’s income tax rate for the nine months ended September 30, 2016 was higher than the U. S federal statutory rate of 35.0% primarily due to state income taxes and certain expenses that are not deductible for the purposes of income taxes, partially offset by benefits from tax credits, the manufacturing deduction, and a $3.1 million tax benefit resulting from tax deductions from vesting restricted stock units in excess of the book deductions that were recognized upon our adoption of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting.