Income Taxes	6 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate for the three and six months ended June 30, 2015 was 36.7% and 34.9%, respectively, and 37.5% and 37.4% for the three and six months ended June 30, 2014, respectively. While the 2014 rates were consistent with the statutory tax rate applicable to the U.S. and the blended state rate for the states in which the Company conducts business, the effective tax rate for the six months ended June 30, 2015 was lower due to permanent differences between the compensation amounts expensed for book purposes versus the amounts deductible for income tax purposes and the impact of a reduction in the North Dakota statutory tax rate in the second quarter of 2015. As of June 30, 2015, the Company did not have any uncertain tax positions requiring adjustments to its tax liability. The Company had deferred tax assets for its federal and state tax loss carryforwards at June 30, 2015 recorded in deferred income taxes. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. As of June 30, 2015, management determined that a valuation allowance was not required for the tax loss carryforwards as they are expected to be fully utilized before expiration.

Income Taxes

6 Months Ended

Jun. 30, 2015

The Company’s effective tax rate for the three and six months ended June 30, 2015 was 36.7% and 34.9%, respectively, and 37.5% and 37.4% for the three and six months ended June 30, 2014, respectively. While the 2014 rates were consistent with the statutory tax rate applicable to the U.S. and the blended state rate for the states in which the Company conducts business, the effective tax rate for the six months ended June 30, 2015 was lower due to permanent differences between the compensation amounts expensed for book purposes versus the amounts deductible for income tax purposes and the impact of a reduction in the North Dakota statutory tax rate in the second quarter of 2015. As of June 30, 2015, the Company did not have any uncertain tax positions requiring adjustments to its tax liability.

The Company had deferred tax assets for its federal and state tax loss carryforwards at June 30, 2015 recorded in deferred income taxes. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion or all of the deferred tax assets will not be realized. As of June 30, 2015, management determined that a valuation allowance was not required for the tax loss carryforwards as they are expected to be fully utilized before expiration.