Income Taxes	3 Months Ended
Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes was $12.1 million for the three months ended March 31, 2017 compared to $15.3 million in the three months ended March 31, 2016. The effective income tax rate was 24.9% for the three months ended March 31, 2017 and 25.4% for the same period in 2016. The quarter-over-quarter decrease in the effective income tax rate was primarily attributable to an increase in stock-based compensation benefits partially offset by an increase in unrecognized tax benefits. As of March 31, 2017 and December 31, 2016, the Company had gross unrecognized tax benefits of $42.6 million and $37.1 million, respectively. It is reasonably possible that gross unrecognized tax benefits will decrease by approximately $3.8 million within the next 12 months, due to the anticipated closure of audits and the expiration of certain statutes of limitation. In July 2015, the United States Tax Court (the “Court”) issued an opinion relating to the treatment of stock-based compensation expense in an inter-company cost-sharing arrangement. In its opinion, the Court held that affiliated companies may exclude stock-based compensation expense from their cost-sharing arrangement. The Internal Revenue Service is appealing the decision. Because of uncertainty related to the final resolution of this litigation and the recognition of potential benefits to the Company, the Company has not recorded any financial statement benefit associated with this decision. The Company will monitor developments related to this case and the potential impact of those developments on the Company’s consolidated financial statements.

Income Taxes

3 Months Ended

Mar. 31, 2017

The provision for income taxes was $12.1 million for the three months ended March 31, 2017 compared to $15.3 million in the three months ended March 31, 2016. The effective income tax rate was 24.9% for the three months ended March 31, 2017 and 25.4% for the same period in 2016. The quarter-over-quarter decrease in the effective income tax rate was primarily attributable to an increase in stock-based compensation benefits partially offset by an increase in unrecognized tax benefits.

As of March 31, 2017 and December 31, 2016, the Company had gross unrecognized tax benefits of $42.6 million and $37.1 million, respectively. It is reasonably possible that gross unrecognized tax benefits will decrease by approximately $3.8 million within the next 12 months, due to the anticipated closure of audits and the expiration of certain statutes of limitation.

In July 2015, the United States Tax Court (the “Court”) issued an opinion relating to the treatment of stock-based compensation expense in an inter-company cost-sharing arrangement. In its opinion, the Court held that affiliated companies may exclude stock-based compensation expense from their cost-sharing arrangement. The Internal Revenue Service is appealing the decision. Because of uncertainty related to the final resolution of this litigation and the recognition of potential benefits to the Company, the Company has not recorded any financial statement benefit associated with this decision. The Company will monitor developments related to this case and the potential impact of those developments on the Company’s consolidated financial statements.