Income Taxes	6 Months Ended
Jun. 30, 2017
Income Taxes [Abstract]
Income Taxes	Income Taxes Our effective tax rate for the six months ended June 30, 2017, decreased period-over-period to 30.8% from 32.6%. The decrease in the effective tax rate was primarily attributable to the recognition of an additional tax benefit from share-based compensation of $14.8 million resulting from the prospective adoption of ASU 2016-09 (see Note 1), which requires that additional tax benefits and deficiencies arising from share-based compensation be recognized in results of operations in the period when the awards vest or are exercised. In the prior year, the tax benefits and deficiencies were recorded in additional paid-in capital. At June 30, 2017, our unrecognized tax benefits were $110.0 million. Of this amount, approximately $72.3 million would affect our effective tax rate upon resolution of the uncertain tax positions.

Income Taxes

6 Months Ended

Jun. 30, 2017

Our effective tax rate for the six months ended June 30, 2017, decreased period-over-period to 30.8% from 32.6%. The decrease in the effective tax rate was primarily attributable to the recognition of an additional tax benefit from share-based compensation of $14.8 million resulting from the prospective adoption of ASU 2016-09 (see Note 1), which requires that additional tax benefits and deficiencies arising from share-based compensation be recognized in results of operations in the period when the awards vest or are exercised. In the prior year, the tax benefits and deficiencies were recorded in additional paid-in capital.

At June 30, 2017, our unrecognized tax benefits were $110.0 million. Of this amount, approximately $72.3 million would affect our effective tax rate upon resolution of the uncertain tax positions.