Income Taxes	6 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective tax rate was 35% for the six months ended June 30, 2015, compared to 32% for the six months ended June 30, 2014. The difference in the effective rates for the prior year, compared to the statutory rate of 35%, is primarily attributable to the mix of pretax income among domestic and foreign jurisdictions which are taxed at different rates. The current year reflects a higher contribution from domestic source income, which is taxed at a higher rate, as well as the impact of an increase in the statutory tax rate in Alberta, Canada. As of June 30, 2015, our gross liability for unrecognized tax benefits was $5.6 million. If fully recognized, these tax benefits would decrease our income tax expense by $5.6 million ($3.6 million, net of federal tax). We do not anticipate the recognition of any tax benefits that were previously unrecognized within the next 12 months.

Income Taxes

6 Months Ended

Jun. 30, 2015

Our effective tax rate was 35% for the six months ended June 30, 2015, compared to 32% for the six months ended June 30, 2014. The difference in the effective rates for the prior year, compared to the statutory rate of 35%, is primarily attributable to the mix of pretax income among domestic and foreign jurisdictions which are taxed at different rates. The current year reflects a higher contribution from domestic source income, which is taxed at a higher rate, as well as the impact of an increase in the statutory tax rate in Alberta, Canada.

As of June 30, 2015, our gross liability for unrecognized tax benefits was $5.6 million. If fully recognized, these tax benefits would decrease our income tax expense by $5.6 million ($3.6 million, net of federal tax). We do not anticipate the recognition of any tax benefits that were previously unrecognized within the next 12 months.